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Mitsubishi amplifier nomenclature:


A Indicates the first generation of the amplifier. B denotes second generation, denotes third, etc.

V2 Indicates that the amplifier is a dual amp.

1005 Indicates current capacity of the dual amp. 10 amps and 5 amps, 
  first and second axis respectively.

An important thing to know about the above designation is that a first generation amplifier can be replaced with a second generation or a second generation amp can be replaced by a third but not the other way around. A second generation amplifier cannot be replaced with a first generation amp, for example.

Virtually all built by Mitsubishi Heavy Industries (horizontals, etc.) have scales on the axes for position feedback and the pulse coder on the motor is used like a tach (velocity feedback). If the machine uses a Fanuc 18 control you tell if it has axis scales by looking at parameter 1815.1 (OPT).

1815.1 = 1 Separate pulse coder is used.
            = 0 Separate pulse coder is not used.

Quite often these machines will have an M-code that is used to set a compensation factor based on temperature. This procedure varies from machine to machine and is used to compensate for linear error due to temperature.

The ladder on a Mitsubishi control can be forced. The procedure is:

1. Select any mode.
2. Press DIAGN IN/OUT button.
3. Press PLC-I/F button.
4. At DEVICE prompt key in the instruction you wish to activate 
    (i.e. X1,Y1 etc).
5. At the DATA prompt key in the value you desire (ex. 0 or 1).  
    Normally a 1 will turn on the instruction.
6. At mode prompt, key in a 2. This will force the instruction on and keep it on until turned off with the force command or until power is 
7. Press INPUT button.

To reset the instruction to its natural state, follow the same procedure But set the DATA for the opposite value. (Ex. 0 instead of 1)
Cycling power will also reset the bit.

Once an instruction has been forced it will blink every few seconds when viewed in the ladder.

To access the Ladder diagram:

1. Press the FO button.
2. Press the LADDER soft key.
3. Press the 2CIRCUIT soft key.
4. Press the MENU soft key.
5. Press the MONITOR soft key.
6. Enter the instruction type.
7. Enter the number of the instruction.
8. Press the INPUT button.

Following this procedure will allow you to view the ladder in it's active state.

There are two methods of searching for a program:

Method 1
1. Press the DIAGN IN/OUT button.
2. Press the MENU soft key.
3. Press the MENU soft key again.
4. Press the FILE soft key.
5. Key in the program number.
6. Press the INPUT button.

Method 2
1. Press the EDIT button.
2. Press the EDIT soft key.
3. Press the SEARCH soft key.
4. Key in the program number.
5. Press the INPUT button.

In MDI mode, a tool command must take the form of M6 T*; If the tool number is entered before the M6, the M code will not be read. Instead, the T code will be read and the magazine will rotate to the tool position called.

The procedure for transferring everything you need to restore the memory of a Mitsubishi control is:
1. Stop the PLC from running.
    Press the E-Stop button then open the window on the control unit and
    turn switch CS2 to 1 or 1.Press the FO button. 2. Press the FILE soft key. 3. Enter 1 at RUN/STOP.) 
2. Press the DIAGN IN/OUT button.
3. At the #( ) prompt enter (99).
4. At the DATA( ) prompt enter (ALL1).
5. Press the INPUT CALC button.
6. At the #( ) prompt enter (99).
7. At the DATA( ) prompt enter (ALL2).
8. Press the INPUT CALC button.
9. At the #( ) prompt enter (99).
10. At the DATA( ) prompt enter (ALL3).
11. Press the INPUT CALC button.

320 meters of memory equals 128000 bytes.

The procedure for erasing a program is:
1. Press the DIAGN IN/OUT button.
2. Press the ERASE soft key.
3. At the #( ) prompt enter (1).
4. At the DATA( ) prompt enter the desired program number.
5. Press the INPUT CALC button.
The control will display ERASE COMPLETE.

To search for a program press the DIAGN IN/OUT button then the FILE soft key.

To delete all data from the screen (i.e. an MDI program):
1. Press the SHIFT button.
2. Press the C-B CAN button.

To activate the Screen Saver (clear the display):
1. Press the MONITOR button.
2. Press the POSI soft key.
3. Press the SHIFT button.
4. Press the C-B CAN button.

Press the MONITOR button to restore the display.

To zero the Position Display:
At the Position Display or Work Coordinate Display, press the button that corresponds to the axis you want to zero (X,Y or Z), then press the INPUT CALC button.

To zero the Position, Work, Program and Work Displays, press the button that corresponds to the axis you want to zero (X,Y or Z), then press the C-B CAN button. This is equivalent to G92X0Y0Z0. It will zero the G54 setting.

To execute an M, S or T function from any mode:
1. Go to the Position Display.
2. Press the button corresponding to the function you want M,S or T).
   (That function will become highlighted.)
3. Enter the numeric value you desire. (6 for tool change etc.)
4. Press the INPUT CALC button.
The miscellaneous function executes.


When reading Mitsubishi Diagnostics remember that they are numbered in Hex.
You will normally see:
X0000 00000000
X0008 00000000
X0010 00000000

They are read this way:

X0000 00000000 Diagnostic number 0 to 7 reading right to left.
X0008 00000000 Diagnostic number 8 to F reading right to left.
X0010 00000000 Diagnostic number 10 to 18 reading right to left.

When the control powers up, data from the EEPROM is transferred to the

Be careful when using the ERASE function, you can easily lose all of your programs and offsets.

If you inadvertently lose the FIXED CYCLES, they are still stored on EEPROM so all you need to do is change FIX_P to 1, go to INPUT screen and enter # (4) and press INPUT. The FIXED CYCLES will be loaded from EEPROM.

The Power Supply, Spindle Amplifier, and all Servo Drives are linked by a communication cable. This chain begins at the CPU card and ends with a termination plug on one of the units, normally the Spindle Amp. If you have an alarm that will not go away and you suspect a hardware problem with one of the drives or the Spindle Amplifier, you can eliminate all of them by removing the cable at the CPU and moving the terminator plug from it's location to the port on the CPU where the cable was. Then go to the MACHINE BASE PARAMETERS and change BASE SPEC PARAMETER (Noamp) to equal 1. This tells the NC that there are no drives connected and so not to issue an alarm. If the alarm in question goes away, there is likely a hardware problem.

Whenever troubleshooting alarms a useful tool is the Register R69. Go to DIAGN, PLC-IF and type R69 into DEVICE ( ) and press INPUT. Both lines of R0069 should always be all ones. R0069 11111111

If any of these are zero, the meaning is as follows:

R0069 76543210 HEX FF 0 equals emergency status 1 equals normal

  _   1   1   1   1   1   1   1   1
  |    1   1   1   1   1   1   1   1
  |    |    |     |    |    |    |    |    |____________ Built-in PLC software error output; PLC is stopped.
  |    |    |     |    |    |    |    |______________ Serial input/output interface card hardware error.
  |    |    |     |    |    |    |_________________ PLC serial link preparation sequence incomplete.
  |    |    |     |    |    |___________________ PLC serial link communication error.
  |    |    |     |    |______________________ Contact I/O interface card output; X27 is 0.
  |    |    |     |________________________ Board interface card output.
  |    |    |___________________________ Built-in PLC software error output; Y29F is 1.
  |    |______________________________ Board contact I/O card output; X127 is 1.
  |________________________________ Servo alarm.

This information can be found in the DIAGNOSIS section of the INSTRUCTION MANUAL. One of particular note is X27 which if is a zero will appear as:

R0069  11111111

X127 is normally tied to the machine's E-STOP. It is like any other bit, you can go the Diagnostics and monitor it's status.

This has to do with the I/O string and is almost always caused by a problem on the machine side. If this bit goes low you should start looking for a broken connection between the I/O board and the machine. Sometimes it may be caused by a defective I/O board. It may be helpful to work with the machine electrical manual and the Diagnostics.

The failure of a Servo Amplifier may exhibit the following symptoms:

When the amp is cool, the axis works fine but as the temperature increases the axis motion has a noticeable jerk that gets worse and worse until it eventually faults due to an over current condition. (S01 0003A).

Mitsubishi numbers it's I/O a little differently than Fanuc. The X and Y addresses are numbered the same way, it works like this:

                     7       6       5       4       3       2       1       0       HEX

X0000          7       6       5       4       3       2       1       0
X0008          F      E      D      C       B      A      9       8
X0010        17     16     15     14      13     12     11     10
X0018        1F    1E     1D    1C     1B     1A   19     18
X0020        27    26      25     24      23     22     21    20
X0028        2F   2E     2D     2C     2B    2A    29    28

The value of each word works this way:

It is broken into four bits each, 0-3 and 4-7. The highest numeric value allowed is binary nine. Ten to fifteen are represented by letters. What follows is all of the possible words with the accompanying Hex value.

7     6     5     4     3     2     1     0     HEX
0     0     0     0     0     0     0     0      00
0     0     0     0     0     0     0     1      01
0     0     0     0     0     0     1     0      02
0     0     0     0     0     0     1     1      03
0     0     0     0     0     1     0     0      04
0     0     0     0     0     1     0     1      05
0     0     0     0     0     1     1     0      06
0     0     0     0     0     1     1     1      07
0     0     0     0     1     0     0     0      08
0     0     0     0     1     0     0     1      09
0     0     0     0     1     0     1     0      0A
0     0     0     0     1     0     1     1      0B
0     0     0     0     1     1     0     0      0C
0     0     0     0     1     1     0     1      0D
0     0     0     0     1     1     1     0      0E
0     0     0     0     1     1     1     1      0F
0     0     0     1     0     0     0     0      10
0     0     1     0     0     0     0     0      20
0     0     1     1     0     0     0     0      30
0     1     0     0     0     0     0     0      40
0     1     0     1     0     0     0     0      50
0     1     1     0     0     0     0     0      60
0     1     1     1     0     0     0     0      70
1     0     0     0     0     0     0     0      80
1     0     0     1     0     0     0     0      90
1     0     1     0     0     0     0     0     A0
1     0     1     1     0     0     0     0     B0
1     1     0     0     0     0     0     0     C0
1     1     0     1     0     0     0     0     D0
1     1     1     0     0     0     0     0     E0
1     1     1     1     0     0     0     0     F0
0     0     0     1     0     0     0     1     11
0     0     0     1     0     0     1     0     12


Further examples:

1     1     1     1     0     0     0     1     F1
1     1     1     0     1     0     1     0    EA
1     1     1     1     1     1     1     1    FF
1     0     1     0     0     0     1     1    A3
0     0     1     1     1     0     1     0    3A

The cartridge that contains the ladder is a Flash ROM. In the case of the QX812 it is a 256K Flash ROM, Mitsubishi P/N A52812. It costs $448.50. A used one can be bought for $314.60. The part number for a used one is A52812EX.

The ladder of Mitsubishi controls can be copied onto a blank Flash ROM. The procedure is:

1. Press the FO button.
2. Press FILE soft key.
3. Press 4RUN/SP soft key.
4. Enter 1 in ( ). Press INPUT button.
    This stops the PLC (ladder). 0 = RUN 1 = STOP
5. Press the FO button.
6. Press the I/O ST soft key.
7. Press the 4ROMWRT soft key.
8. Press the SET soft key.
9. Enter 1 in ( ). Press the INPUT button.
10. Enter Y in ( ). Press the INPUT button.
11. Turn NC power off.
12. Set SW8 to ON.
      (SW8 is the DIP on the CPU. SW6 and SW7 are normally set OFF. If they are not they need to be for this procedure).
13. Plug the ladder you want a copy of into CBUS1 and the one you want to copy onto into CBUS2. (Make sure they have the same 
14. Turn NC power on. When LED1 and LED2 (Green LED's) both come on the  copy is done. They also come on in different  
      combinations to indicate that the operation is in progress or that an error has  occurred.
15. Turn NC power off.
16. Set all switches (DIP) on CPU to off.
17. Turn NC power on.

If you need to change the Language displayed by the NC, the parameter is Machine Base Parameter 21 (lang). 1 = English.

For Left Hand Tapping use G74 and command M4 as compared to G84 and M3 for normal tapping.

Alarm M01 0004 A means the 4th axis cannot move because the interlock is activated. Normally, this means that the axis needs to be unclamped by activating the appropriate M-Code. In the case of a Takumi, this is either M10 or M11.

Normally, once the 4th axis is installed, Parameter #32 smcp_no must be 15. This is because this parameter identifies which slot the Spindle Amplifier is in. The 1 refers to the rack, the 5 is the slot. The slot number refers to where the amps is connected in the chain relative to each other. On a machine with three axes such as a Takumi, the cable configuration will usually be: From the NC in to CN1A of the Dual Amp (Y and Z), out of CN1B, in to CN1A of the X axis amplifier, out of CN1B, in to CN1A of the 4th axis amplifier, out of CN1B, in to CN1A of the Spindle amplifier. CN1B of the Spindle amplifier will have a plug to terminate the chain. With this configuration, the proper setting of the mcp_no parameters is 11 for X, 12 for Y, 13 for Z and 14 for the 4th.

In order to turn off the 4th axis when not installed or not in use, make Axis Parameter #4 = 1.

1. Press TOOL/PARAM button.
2. Press RIGHT CHAPTER button.
3. Press AXIS soft key.
4. # ( 4 ) AXIS ( A ) DATA ( 1 )
5. Press the INPUT button.

Depending on the machine builder, it may be necessary to change a Latch Parameter or something in addition to the Axis parameter. In the case of a Takumi machine you must also make Latch Parameter L12 = 0.

When you uninstall a 4th axis you must change Base Spec Parameter #4 axtype to 1. It should look like:

#                           axtype          sysnu          axname
1       axis    01         0                  1                   X
2                  02         0                  1                   Y
3                  03         0                  1                   Z
4                  04         1

Once axtype is set for 1, the other two have no significance. If this parameter is not set to 1 you will get the alarm:
Y06 mcp_no error 0001 4

This alarm can be misleading. It can cause you to chase after mcp_no parameters.

If the control gives you trouble when you try to set these parameters, i.e. E01 SETTING ERROR, try setting one of the fields at a time.

Anytime you either install or un-install a 4th axis, the Spindle Parameters will get messed up and have to be re-entered. If the axis is being removed it is easier because you can simply upload the original parameters. This can be done with the Y03 and Y06 alarms and the E-Stop in. But if the axis is being installed obviously you can't do this. You will have to enter them by hand. Before either installing or removing the 4th axis be sure to write down the Spindle Parameters before you start.

When working with the 4th axis if you get Y03 Amp Unequipped, the problem is usually SP #32. It must equal 14 if the 4th axis is removed and 15 if the 4th axis is installed.

To access this parameter:
1. DIAGN button.
2. PLC-I/F soft key.
3. (1001) ( ) (M)
4. INPUT button.
5. TOOL/PARAM button.
6. MENU soft key.
7. MENU soft key.
8. SPINDLE soft key.

If the problem is with a spindle parameter there should be an S displayed.

In the above example, the 118 refers to a Spindle NC Parameter. [SP-NC PARAM]

Normally, when the spindle parameters get messed up after installing or removing the 4th axis you will get alarms like this. You can go to 118 and correct it but when you power back up you will get the same alarm but for parameter 95, etc.

When entering data in a Bit Select you have to enter the first digit, cursor over, enter next digit, cursor over, etc.

If you initialize a controller,  you have to turn Bit Selects and Latch Parameters back on. Most of them will be set to zero by initializing.

On many machines, initializing will change the Bit Select which allows the control to display Machine Builder alarms.

For some Mitsubishi parts try Livingston and Haven in Midlothian, phone # 804-744-0805

Some Mitsubishi manuals can be downloaded from their website, the address is

For all of the procedures that follow one step may be left out. This step is the MENU soft key. So if you have trouble, try using this soft key.

On some controls, the CPU board is QX611-1. On others it is QX141-1.

If a Parameter has a PR beside it in the manual, the NC power must be cycled for the change to become effective.

When using G84 (RIGID TAPPING) on a Mitsubishi control, it is not necessary to give preparatory commands such as G98 (FEED PER REVOLUTION).

If the NC skips blocks or characters while running a program it usually means that the cable is too long. A distance no greater than 50 feet is recommended Mitsubishi controls use a cartridge to store the ladder. The cartridge is the one on the right. Inside the cartridge are four EEPROMS.

The last four numbers of a dual servo amplifier part number refer to the axis capacity. For example, 2020 denotes equal amplifier capacity for both of the controlled axes. 1005 denotes a capacity of 10 on the first controlled axis and 05 on the second.

Some versions of Procomm do not work well when trying to DNC with Mitsubishi controls. Typically, they will generate alarm P460, TAPE I/O ERROR.

If a control's battery voltage drops and you have to initialize the memory, a lot of times some of the Bit Selects will reset to zero. One notable result of this is that when an alarm occurs, no alarm message will be generated.

Machine builders include these values in with the paper copy of the parameters.

If a soft key is stuck in when you press another soft key the control will switch to the corresponding function but when you release the button it will return to the function corresponding to the key that is stuck.

You can search a program form the EDIT page but this is actually more for Background Edit. It will not give the desired result.

Also, to edit a program you search from the Edit page.

If a machine stops running or does something else wrong for no obvious reason and does not display an alarm, press the DIAGN button to view the Stop Code. For example, T03 Block Stop Error No. 0301 is a situation where the machine goes in to Feed Hold because of Single Block.

If the magazine just keeps rotating when a tool is commanded, it may be necessary to perform a Tool Table Reset (Control Parameter #4). If the Tool Register information has been lost and re-entered it will still be necessary to perform a reset.

If you install a 4th axis on a machine and the table rotates less than it was commanded, you can change Parameter PC2 to make them agree. In this case you would increase the value. Of course, if the table goes further than commanded, try decreasing the parameter.

M addresses can be forced.

In the Ladder, alarms have the address designation F. They can be searched using the -< >- and F1, F2 etc. Alarm AL1002 is F2 in the Ladder, AL1003 is F3, etc.

If you are not sure what the instruction type is you are looking for in the ladder, just type in the address. When you select an address that does not agree with the instruction type you choose, the NC gets confused and issues COMMAND CODE ERROR.

In the ladder when a Timer is displayed, its value (preset) and current value (count) is displayed. This information is normally displayed in the lower left hand corner and is shown in real time. You can observe the timer counting down from the preset.

When trying to scroll through Mitsubishi ladder, controls seem to differ. Pressing the SHIFT button then the + button works sometimes while on another control you may have to press the + button first. Either way, normally you can then get it to step through the ladder with each press of the INPUT button.

Most Latch Parameters take effect as soon as they are changed while others require that the NC power be cycled. Most of these parameters can even be changed while a program is running.

This symbol, >< beside an axis position on the position page means the axis is released. That is, it has been removed from use by parameter and can not be used. As such, problems with the axis in terms of hardware or parameter settings will be ignored by the control.

The symbol, #1, beside an axis position indicates that reference point return has been performed and the axis has successfully reached home position.

When working with the Ladder you may not want to follow the Mitsubishi instructions. This is what I have found in working with the Ladder.

To search the ladder starting from the top (first instruction)
1. Press the FO button.
2. Press the LADDER soft key.
3. Press the 2CIRCUIT soft key.
4. Press the 6MONIT soft key.
5. Press the +! button.
6. Press the INPUT button.

The ladder display goes to the top of the program. Each press of the INPUT button steps down one page. If you have already entered the ladder by searching for a specific instruction you can still step through the ladder from that point.

1. Press the 6MONIT button.
2. Press the +! button.
3. Press the INPUT button.

Again, each time you press the INPUT button another page will be displayed. You must press the 6MONIT soft key even though you have already pressed it to monitor the previous instruction and it may still be highlighted, you must press it again. To scroll back in the other direction, enter -, INPUT.

Mitsubishi rungs are called steps whereas Fanuc calls them nets. These can be searched by choosing the soft key 7l and entering the step number. Step 251, for example, is called P251 but when you search just type 251 without the P.

When the NC is turned on, the PLC enters RUN mode. Even if the PLC was turned off by inputting a 1 at PLC RUN/STOP before turning it off. If you want the NC to power up with the PLC stopped, you must set selector switch CS2 to position 1.

#1 beside an axis means that axis is at home.

To search for a specific character or instruction in a program:

With the program on the screen, press the SEARCH soft key. For example, if you are looking for tool two:

O (  )   N ( T2 ) - (  )

The SEARCH function will start it's search from where it is, that is, if you are halfway through the program, it will start looking there. If you are at the top of the program, it will start there...

To do Background Edit, just press the SEARCH soft key while running a program, search out the program you want to edit, press INPUT, start editing.

You can delete an entire page of a program at once. To do this, press the SHIFT and CAN buttons at the same time. Everything on the left side of the screen (one page) will disappear. This data will not truly be gone until you press the INPUT button. If you press the LAST PAGE button before pressing INPUT, the data will come back.

To do Automatic Tool Length Measurement:

1. Zero Return the Z axis.
2. Put the tool you want to measure in the spindle.
3. Press the TOOL/PARAM button.
4. Press the TLM soft key.
5. Move the tool down to the top of the part.
    The Z distance from the ZRN position to the part will be displayed in the Data field, i.e. # ( ) DATA (14.7450)
6. Enter the number of the tool you are measuring, i.e. 
    # (2) DATA (14.7450)
7. Press the INPUT button.

To set Work Coordinates:

1. Zero Return the axes.
2. Press the TOOL/PARAM button.
3. Press the WORK-M soft key.
    You will see:
    #41 G54 X 0.0000
     42 Y 0.0000
     43 Z 0.0000

  Will also see G55, etc.

4. Move an axis to the desired coordinate. The position of the axis moved relative to its reference position will be displayed in the data field.
5. Enter the number corresponding to the axis you moved. For example,   #41 in the case of G54 for the X axis.
6. Press the INPUT button. The value displayed in the data field is stored in the work coordinate.

Work Coordinates can also be set manually in the regular work coordinate page. If you press the WORK soft key instead of the WORK-M soft key as above, the work coordinates are displayed. Everything is the same as above except that the position is not automatically displayed in the data field. You have to type it in yourself but there is a portion of the screen which shows how far a given axis is from it's reference point. This area is labeled [TLM-P].

If a Mitsubishi controlled machine vibrates or makes a growling noise try adjusting the following parameters in the order they are listed.

1. VG1
2. IQC
3. IDG

In each case, decrease the setting by 50 until desired result is achieved. If the problem persists:

Turn on STY FBC (Bit B). Turn on STY FBF 1 to 3 (Bit 8 to A) in the following order:

          FBF3 (Bit A)     FBF2 (Bit 9)     FBF1 (Bit 8)
1        1                         1                        1
2        1                         0                        0
3        0                         1                        0
4        1                         1                        0
5        0                         0                        1
6        1                         0                        1
7        1                         1                        1

VG1 is a parameter for setting the response of the speed loop. Decreasing this parameter decreases the response.

If the noise and/or vibration persist set a value in SP2 which is the cutting feed plus 100 rpm. Also make sure the value of VG1 is the same as VG2.  Next try decreasing the value of VG2 in steps of 10.

VG1 is also useful for correcting surface irregularities during linear interpolation and making of circles. In this case, increase the setting of VG1 by 20 until vibration or noise occurs in the axis. If noise or vibration do occur before the irregularity goes away, the problem cannot be corrected with VG1. Normally, this type of irregularity will result in a rippling effect when the machine is doing linear interpolation such as a 45 degree movement. Also will show up as a ripple effect at the quadrants (transition points) of a circle. Another condition that may be corrected by VG1 is dipping in or out of the tool at the quadrants of a circle. Again, change the value of the parameter by 20 until desired result. Either increase or decrease depending on whether the tool dips in or out at the transition points. If VG1 does not help try:

1. Turn on STY SMC (Bit E).
2. Increase TGN by 20 until desired result is achieved.

Adjusting TGN can actually change the character of the axes to the point that the machine can go from making circles that dip out to circles that are dented ,that is, dipping in.

Whenever an axis overshoots, check the Droop amount on the Servo Monitor Screen. If the Droop overshoots by the same amount, make adjustments to the servo parameters. If the Droop does not overshoot, check the mechanical parts of the axis. If the Droop overshoots in a semi-closed loop system:

1. Increase VG1 by 50 until vibration or noise occurs while the axis is stopped or during rapid traverse.
2. Increase VIA by 200 each step.

The overshoot versus droop rule also applies for a closed loop system but the method of adjustment is a little different. In the case of a closed loop system where the Droop overshoots:

1. Increase VG1 by 50 until the axis vibrates or makes a growling noise either at rest or in rapid traverse.
2. Increase VIA by 200 per step.
3. Decrease PGN by 5 per step.
4. Turn on SSF PID (Bit 0). Decrease VIL by 5 per step.
5. Turn on SSF PID (Bit 0), IDC (Bit 1) and IDF (Bit 2). Decrease VIL
     by 20 per step. If overshoot is removed with step four but response
     is reduced, try step five.
6. When a 1um or .1um scale is used, if a deviation within 1um or .1um 
     occurs in the stop state turn on SSF CNG (Bit 11).

If Edit Lock A is turned on the Control Parameters will be locked for editing.

The mode displays such as HANDLE, MDI, MEMORY, etc. are written by the machine builder. If one or more of these are not displayed there may be a problem with the PLC. In addition, these mode selections are turned on by the Ladder program. As such they are output addresses and are controlled just as any other output coil. If there is a problem with the display of one of the modes you can look for the cause in the ladder. Some builders will use a Latch Parameter on the rung for some of these modes to enable and disable the modes. An example of this is on a YCI Max-3 Rebel with a Mitsubishi 335 control. On some of these machines YCI put Latch Parameter L20 on the rung for the JOG and ZRN modes. If L20 is set to zero, NO MODE will be displayed when either JOG or ZRN are selected by the rotary switch. If EOB is used to display comments, L20 in the ladder will be shown as APHDLE.

The batteries in the MR-J2 amplifiers are Mitsubishi ER17330V/3.6V, these are 3.7 volt lithium batteries.

If you have trouble getting a machine to tap correctly, it will tap but the Z axis appears not to be in sync with the spindle, there are a number of parameters used only for tapping and for synchronous tapping specifically. Most of these are found in the Machine Base Parameters. Normally, the best place to look first is in the Z axis parameters and the Spindle parameters. Sometimes there will be other clues to help find the problem, for example, if in addition to the tapping problem the Z axis has a rough or jerked motion when it is moved by the MPG particularly in .100 increments you should look very closely at the Z axis servo parameters.

Sometimes when you load parameters into a control the ball screw pitch parameter (SV018 PIT) will change. When this happens the machine will l indicate traveled distance other than the actual movement amount. Some controls seem to revert to a value of 12 in this parameter. In the case of Takumi machines, they use a 10mm ball screw so if this happens it will cause the distance moved to be displayed as about 20 percent greater than the actual movement amount.

The rotary selector switches on the amplifiers are used for addressing by the control and should all be set to a different number. This does not apply to the power supply. The power supply normally is set to only one of two positions. Set to zero if the spindle uses a regenerative unit, set to 1 if it does not.

Mitsubishi refers to the power supply as the CV unit.

Also, certain data is stored on EEPROM which can be retrieved in case it is otherwise lost. That data is:

  Option Parameters
  System Parameters
  Fixed Cycles

The data that is not stored in EEPROM:

  Basic Specification Parameters
  Axis Specification Parameters
  Zero Point Return Parameters
  Servo Parameters
  Machine Compensation Parameters
  Spindle Parameters
  Macro List

Builders often use Bit Selects to enable add on devices such as turrets. If you look at these in the ladder, they look like examine on and examine off instructions and are normally labeled as BIT.

If a machine's control shuts down at the end of a program or whenever M02 or M30 is executed, check the Auto Power Off function. On most Mitsubishi controlled machines this normally accomplished with a push button switch but it can also be done with a Latch Parameter.

The parts counter on most Mitsubishi controls is a function of the Window. You must first open a window then look until you find a soft key labeled P_COUNT.

If the NC will not allow you to change the state of a Bit Select parameter, try placing the machine in E-Stop.

The correct way to run a program from memory is to SEARCH the program number from the MONITOR page.

1. Select AUTO mode.
2. Press MONITOR button.
3. Press SEARCH soft key.
4. Input the program number.
5. Press the INPUT/CALC button.

Explanation of the control model number:

5=Control Series
3=Number of Controlled Axes (Basic)
0=Does not support Auto Programming
M=Machining Center

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The information on this and subsequent pages is intended to supplement and reinforce the knowledge of competent machinists and technicians. The authors of this website are in no way liable for damage or injury resulting from the improper use of the instructions contained herein.