Mitsubishi Motors

This is the TI-3000JX option for Mitsubishi motors with serial encoders. The Mitsubishi serial encoders listed in the next section are supported by this selection. Mitsubishi incremental encoders with A, B, and Z lines should be tested as Generic Incremental encoders. 

Types Supported

The following list shows the Mitsubishi encoders that are currently supported by the TI-3000JX option.

Identification

The encoders whose part numbers begin with OSA or OSE apparently are the removable type encoders. They can be removed in one piece from the motor by removing 4 mounting screws. There is a coupling that connects the encoder shaft to the motor shaft. On most of these encoders, the part number can be seen on a bar code sticker after the encoder is removed. These stickers are often not visible when the encoder is mounted on the motor.

The encoders whose part numbers begin with OBA or OBE apparently are the built-in type encoders. These encoders cannot be removed in one piece from the motor. They must be disassembled from the motor shaft. Usually these encoders can be identified by markings on the large, square IC (integrated circuit) on the encoder PCB which can be seen when the encoder cover is removed. An OBA13 encoder will normally have OBA13 stamped on this IC.

Apparently the OSA17, OBA17, OSA18 and OBA18 encoders have the ability to be programmed as other types of encoders. Currently, when a replacement for an OSA14 encoder is purchased, it will be identified as an OSA17 instead of OSA14. In most cases it seems to be identified as OSA17-020. In this situation, the OSA14 selection should be used to run the motor. In a similar manner, some encoders labeled OBA17 are programmed to replace OBA13 encoders. Motors with these encoders should use the OBA13 selection.

The TI-5000JX now reports an encoder ID field for Mitsubishi serial encoders. This field provides further support in identifying the correct selection to use for various encoders - even ones that may be programmed to work like a different part number. Use this encoder ID field to help verify that you have selected the correct encoder. If the TI-5000JX identifies the encoder as a particular type, then use that type as the selection for the TI-3000JX as well.

Feedback Type Selection

Pressing the FBK TYPE key will provide the following selections for Mitsubishi:

Note: The OHE4096 may be labeled as Nemicon SBC4096 (or similar number). Select the appropriate type and connect the encoder cable for the type selected.

Debugging

After the type selection and cable connections have been made, a simple debugging sequence can verify that the motor is ready to run. Performing this debugging check can save a great deal of time and provide confidence in the setup. Skipping this debugging check can cost a great deal of time, and could cause damage to the amplifier or possibly even the motor.

The debugging sequence is as follows:

1. Press the DEBUG key to put the TI-3000JX in DEBUG mode.
   
   
2. Rotate the motor in the forward direction (CCW looking at the shaft for Mitsubishi) and verify that the UVW pulses on the display are correctly moving through the commutation pattern as follows: HLL, HHL, LHL, LHH, LLH, and HLH. It is essential that these six commutation steps are generated on the TI-3000JX.
   
   
3. Connect a bench power supply to the armature leads (amplifier not connected) with the polarity +U and –V. Verify that, at each rotor lockup position, this produces a commutation pattern of V=H, W=L and U at the position where it will toggle between H and L with a very small motion of the motor shaft.
   
   
4. Move the minus lead of the power supply from the V to the W lead. Verify that, at each rotor lockup position, this produces a commutation pattern of U=L, V =H, W at the position where it will toggle between H and L with a very small motion of the motor shaft.

Passing the above debugging checks is a necessary condition for running the motor. If any of these
checks failed, there is absolutely no point in trying to run the motor, and you risk damaging the
amplifier or possibly the motor by doing so.

If it does not pass the Debug check, review your setup and correct any mistakes. Only attempt to run the motor after it passes the Debug check.

After the initial successful debugging, it is no longer necessary to go to debug mode before each run. However, it does provide a chance to check that the brake is released (if it has one) and that the motor is indeed ready to run.

Running

After a successful Debug check, perform the following sequence to run the motor.

1. Connect the motor armature leads to the amplifier using the appropriate connectors.
   
   
2. Press the RUN key to enable the amplifier. The following check list will appear on the display.
   a. Are hands and clothing clear of moving parts?
   b. Is the motor mounted securely?
   c. Is the speed pot set to the zero (stopped) position?
   
   
3. Press the RUN key again after insuring that the check list is satisfied.
   
   
4. The RED LED on the amplifier should change to GRN. If it does not, make sure that the cable from the TI-3000JX to the amplifier is connected correctly and that power has been applied to the amplifier.
   
   
5. Turn the potentiometer either direction from the zero setting, and the motor should begin turning. The bottom line of the display should show the RPM reading.
   
   
6. Returning the pot to zero and moving it the other direction from zero should reverse the direction of the motor.