ESAB PCM-875A Installation, Operation And Maintenance Manual page 88

SECTION 6
6.2.4 Fault light activates when torch is signaled to fire
6-4
PCM-875A Plasmarc System
The Fault circuit is used to monitor conditions
necessary for the safe operation of the PCM-875. The
fault light will glow amber under the following conditions
and operations will come to a complete stop:
·
High/Low line voltage. The Fault Light will rapidly
blink on and off (5 times per second). This indicates
that the input voltage is outside the "+" or "-" 15% safe
operating range rating.
·
Flow fault - The fault light will be mostly on but will
blink off for 1/10th of a second every second. This
indicates that the air flow is low.
§
Check the air pressure at the machine regulator.
It should be adjusted to 65 psig. If no air pressure,
check the air at the supply point. Also, check for
any obstructions in the air hose.
§
Air flow may be blocked at the torch tip. Check
the torch consumables. Also check for any
obstructions in the torch leads.
§
NOTE: If above items check OK , the
problem is internal. send unit to an Authorized
Repair Station for repair.
§
Put the 'Air Check' switch to On position. Air
should flow through torch. If
flow switch may be stuck due to oil in the air. Clean
air flow switch per supplier's instructions or replace
switch. To check if the flow switch is open, put
voltmeter leads between P1-12 and P1-1. It should
read about 12 VDC. When the flow switch closes,
the voltage will drop to zero volts.
§
Air Check switch may also be malfunctioning if
the air is flowing continuously or
On position does not turn air on.
Troubleshooting
not, then the
putting in the