BUG-O Systems SE-4PTD - Manual (Page 37)

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OPERATION CHECKLIST and TROUBLESHOOTING
1. Plug in the machine and turn on the Power switch. Operate the manual joystick in all 4 directions
in turn. This overrides any speed command from the computer control. If the drive runs in a
corresponding direction, and the speed can be varied with the speed pot, this indicates
a) the speed control boards are OK
b) the controller circuit is supplying the required voltage.
If only one motor does not run correctly and the other one does, then it is likely
that the motor’s speed control is faulty.
If both do not operate properly, then there may be a bad component on the
control module that prevents proper voltage to be supplied to the joystick.
A bad connection in the speed signal line to the speed board may also run the
motor in one direction only at full speed.
Manual control must function correctly before checking the computer control
2. Attach the Hand held Pendant and push the Reset button. The display should read “Reset OK”.
Push “D” on the keypad and push “Return” until the display shows the Cut No. and all the data for
the cut.
If the display functions, this indicates
a) the communication line is functioning
b) the computer is operating its program
If the message “Reset Ok” comes up but Pushing “D” or any other key has no effect, there could
be a false signal coming in from the stop button, due to a wire short or damaged switch.
3. Disconnect the Hand held Terminal and turn power on.
Toggle the joystick in all 4 directions after pushing “Reset”. When the joystick is let go, the ma-
chine should go back to its original position.
This confirms the computer is running its program, and also interfacing correctly with the encod-
ers 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 pick up gear or coupling may be loose or the pin in the
encoder plug may not be making a good connection.
If a motor returns home from one direction but not from the other, the speed control may be faulty
and drive only in one direction.