Tweco Troubleshooting Power Supply - Manual (Page 5)

5
D2
100uF
6 3 V
1
8
3
4
5
6
2
7
K6
1N4004 150
1
2
3
4
5
6
J9
Jumper in
HMI
24 VAC
Power
to HMI
24 VAC
24 VAC RET
E-STOP
to Power
Supply
E-STOP
to GAS
Control
24 VAC
To CPU
E-Stop
Input
PLASMA ENABLE
+15V
K3 E_STOP CNC
J9 connects 1:1 to J54
HMI Power connector
on rear panel of CCM
1
2
3
4
5
6
7
8
9
J7
PLASMA ENABLE
To J55 (GCM) pin 2
To J55 (GCM) pin 1
0.1uF
75.0
E-STOP_ PS
47K
1
2
3
4
5
6 +
K5-E-STOP
DPST
1N4004
1N4148
1.2K
GREEN
9 10
CD4050BC
1-2
Pilot Ignition Failure
Pilot ignition requires both HF from the arcstarter (either the Remote Arcstarter
(RAS) or GCM 1000), the pilot contactor on and for units with chopper pilot
regulator, enabling the pilot regulator circuit.
Causes for 1-2 code:
• No HF
• Pilot Contactor not closed
• Pilot Regulator (chopper) has no power.
• Pilot Regulator (chopper) not enabled
• No pilot demand to chopper
• Pilot Regulator (chopper) defective
No spark at RAS spark gap
Pilot ignition phase starts at end of pre-flow or immediately after applying Start
if system is still in post-flow. If pilot doesn’t ignite within 15 seconds of entering
ignition phase, system faults and sets code 1-2.
1. Check that spark gap is set for 0.062” +/- 0.002”. If gap is too high there may
not be enough voltage from T1 to fire the gap.
2. 120VAC from J59-7 & 9 on the power supply connects to J58- 7 & 9 on the
RAS or GCM 1000. From J58 it goes directly to the line filter and passes
through the filter to primary of T1. During the ignition phase, for 15 seconds
following Preflow, check for 120 VAC on the T1 side of the line filter.
• If 120 VAC not present go to step 3.
• If 120 VAC is present and still no spark, T1 may be bad. Remove power
and measure resistance of T1 primary and secondary. T1’s primary should
measure about 3-7 ohms. It’s secondary about 25-35 K ohms. If either
measurement not correct replace T1.