Maintenance and Troubleshooting
Spirit200a User’s Manual Rev J
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8. If 300 VDC is not present at the output terminal block, install a jumper
wire between P28-7 & P28-8 (ILK1). With a start signal applied,
check for 300 VDC at the Spirit output terminal block between
Electrode and Work. If 300 VDC is present, the chopper is working
properly. Check the I/O PCB (HV- Output) and its wiring to the
Microprocessor PCB.
9. If 300 VDC is not present at the output terminal block, leave the
jumper wire installed between P28-7 & P28-8 (ILK1). Check the
chopper status LED’s when a start signal is applied:
a) LED’s 4 & 5 off - go to step 10.
b) LED’s 4 & 5 on, LED 6 off - go to step 11.
c) LED’s 4 & 5 on, LED 6 on, LED 7 off - go to step 12.
d) Only LED 4 or LED 5 on (not both) - replace chopper.
e) All LED’s on – replace chopper.
10. Check the 120 VAC supply to the chopper between P1-1 and P1-3 on
the chopper p.c. board. If 120 V is present, replace the chopper. If
120 V is not present, check fuse F3 and associated wiring.
11. Apply a start signal to the power supply and check the DC voltage
between P2-4 (ground) and P2-5 (signal) on the chopper p.c. board.
This voltage should change from approximately 15.5 VDC to less
than 1 VDC after the main contactor of the power supply is energized.
If 15.5 VDC is not present, replace the chopper. If no voltage change
occurs, check for approximately 15.5 VDC between P26-1 (ground)
and P26-2 (signal) on the microprocessor p.c. board. If 15.5 VDC is
not present, check continuity between P26 on the microprocessor p.c.
board and P2 on the chopper p.c. board. If 15.5 VDC is present at
the microprocessor p.c. board, replace the microprocessor.
12.
Turn off primary power to the power supply
. Disconnect P2 from
the chopper p.c. board and P26 from the microprocessor p.c. board.
Check continuity between P26-8 and P2-1 and between P26-7 and
P2-2. Also check that these wires are not shorted to each other. If
the cable is OK, connect P26 to the microprocessor p.c. board, but
leave P2 disconnected from the chopper. With power applied, give
the power supply a start signal and check for approximately 10 VDC
between P26-7 (ground) and P26-8 (signal) when the main contactor
is energized. If 10 VDC is not present, replace the microprocessor
p.c. board. If 10 VDC is present, turn all power off, reconnect P2 to
the chopper p.c. board, and repeat the test for 10 VDC between P2-2
(ground) and P2-1 (signal). If 10 VDC is present and LED 7 is not
illuminated, replace the chopper.