BUG-O Systems Programmable Gantry System - Manual (Page 33)

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1. Plug in the machine and turn on the Power Switch. Use the X and Y direction toggle switches to jog the GANTRY
in all 4 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 does not run then it is likely that the motor’s speed control is faulty. If both X and Y motors do not
operate properly then there may be a bad component on the control module that prevents proper voltages to be
supplied to the toggle switches.
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” until 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 X and Y switches in all 4 directions after pushing Reset. When the switch 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 from the other, the speed control may be faulty and drive only
in one direction.
OPERATION CHECKLIST AND TROUBLE SHOOTING