BUG-O Systems Programmable Shape Machine - Manual (Page 29)

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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 four directions in
turn. this overrides any speed command from the computer control. if the drives run in 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 voltages.
if only one motor runs correctly then it is likely that the other 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 voltages 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 handheld Pendant and push the reSet button. the display should read “reset oK”. Push D
on the keypad and push “retUrN” till the display shows the Shape No. and data for all segments. 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 handheld terminal and power up.
toggle the joystick in all four directions after pushing reSet. when the joystick is let go, the machine
should go back to its original position.
This confirms the computer is running its program, and also interfacing correctly with encoders and the
speed signal outputs to the speed boards.
if one motor returns to 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 pins in the encoder
plug may not be making good connection.
if a motor returns home from one direction but not not from the other, the speed control may be faulty and
drive only in one direction.