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section 6
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caution
6.1
troubleshooting
Check the problem against the symptoms in the following troubleshooting guide. The remedy may be quite
simple. If the cause cannot be quickly located, shut off the input power, open up the unit, and perform a simple
visual inspection of all the components and wiring. Check for secure terminal connections, loose or burned wir-
ing or components, bulged or leaking capacitors, or any other sign of damage or discoloration.
The cause of control malfunctions can be found by referring to the sequence of operations, electrical schematics
and checking the various components. A volt-ohmmeter will be necessary for some of these checks.
6.2
troubleshooting Guide
As the unit is powered up, the display should show EPP-201 for one second and then show the program number
such as: Pr 2.01 or higher. If the display remains blank, look for the following:
a. loose or missing display cable between the main control board and the display board
b. lack of +15 volt bias supply which could be caused by blown fuses F1 or F2
c. an open circuit breaker CB1 on the front panel.
If the unit shows Error 5 after the program number display times out, look for a closed start switch. To reset the
unit simply open the start switch. At this point the display should show 0's in both windows. If the power source
is not connected to a CNC at power up, the emergency stop relay (K4) in the power source is not energized, pre-
venting any relay operation in the power source itself.
If the CNC has been booted up the display should read 0 for both the volts and amps. The unit will not re-
spond to a start signal until it's master (primary) select input (pin H on J1) is connected to the "HOT
"side of the 115 input (master (primary) select input). This connection is handled in the CNC to primary supply
cable. Note all inputs from the CNC are relay closures, providing 115 V AC inputs to the isolation board (PCB4 in
the power source). The isolation board converts these inputs to open collector type outputs. The control will
monitor various signals in the idle mode and will shut down with an error indication if the condition is not satis-
factory: Error 1, 3, 4, 5, 9 or 12 (See 6.3 Help code list).
As the start switch is activated and the unit is being prepared for cutting, additional conditions are being moni-
tored. The resulting error conditions are as follows: Error 2, 6, 8, 12, 13, 15, 17, 18, 19 or 113 (See 6.3 Help code list).
electric shock can kill!
do not permit untrained persons to inspect or repair this
equipment. electrical work must be performed by an expe-
rienced electrician.
stop work immediately if power source does not work properly.
have only trained personnel investigate the cause.
use only recommended replacement parts.
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