BUG-O Systems MM-1 - Manual (Page 46)

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OPERATION CHECKLIST AND TROUBLESHOOTING
1. Plug in the machine to the required voltage source and turn “ON / OFF” switch to the “ON” position.
Operate the “MANUAL JOG” switch in all four directions. This overrides any speed command from the
computer control. If the drive runs in the corresponding direction, and the speed can be varied with the
“SPEED CONTROL” this indicates:
• The speed control board is operating properly
• The controller circuit is supplying the required voltages
If only one motor does not run correctly and the other one does, then it is likely that the motors speed
control is faulty.
If both do not operate properly, then there may be a component on the control module that prevents
proper voltages from being supplied to the “MANUAL JOG” switch.
A bad connection in the speed signal line to the speed board may also run the motor in one direction at
full speed.
Manual controls must function properly before checking the computer controls.
2. Attach the Handheld Pendant and push the “RESET” button on the control panel. The display should
read “Reset OK”. Press the “D” Key on the Pendant keypad and press “Return” until the display shows
the Cut No. and the data for that programmed cut. If the Pendant display functions, this indicates:
• The communication line is functioning
• The computer is operating its program
If the message “Reset OK” comes up but pressing “D” on the pendant keypad or any other key has no
effect, there could be a false signal coming in from the “STOP / RESUME” button, due to a wire short
or damage switch.
3. Disconnect the Handheld Pendant and turn the “ON / OFF” switch to the “OFF” position.
Toggle the “MANUAL JOG” switch in all four directions after pushing the “RESET” button. When the
“MANUAL JOG” switch is let go, the machine should go back to its original position.
This confirms that the computer control is running its program, and also interfacing correctly with the
encoders and the speed signal outputs to the speed boards.
If one motor returns home and not the other, then the computer may not be receiving the encoder
signals properly from that axis encoder. This may be due to:
• A fault in the encoder
• The encoder pickup gear not being engaged with the gear rack
• The coupling connecting the gear to the encoder may be loose
• The pins in the encoder plug may not be making a good connection
If the motor returns home from one direction but not from the other, the speed control may be faulty
and drive only in one direction.