PTA522, PTA523 and PTA524 Automatic Silent Compressors Chapter 4: Troubleshooting
Page 12 ETN057391-D02
Chapter 4 Troubleshooting
Warning
Before any operation on the compressor, disconnect the unit from the power socket.
Vent the air tank before dismantling any part of compressor unit’s pressure system.
The following operations must only be performed by someone trained and familiar with the maintenance of
compressors.
4.1. Typical Faults
4.1.1. The compressor does not start
a. No power from mains. Check fuses, circuit breaker and socket.
b. Breakage or loose joints in electrical connections. Check for continuity as per wiring diagram (See Figure 4 Wiring
Schematic).
c. Pressure in the air tank is above the cut-in threshold. The compressor will only start if the tank pressure is below
the minimum set level (6 bar/90 psi); if needed, vent to below this pressure to allow the motor to cut in again.
d. Leaky non-return valve (Figure 14, item 1). Remove the flexible pressure pipe (item 2) to check if air leaks out from
the valve. If so, unscrew the valve cap (item 3), clean the rubber disk (item 4) and its seat with a dry cloth and re-
assemble the unit with care. If leakage persists, the whole valve must be replaced.
Figure 14 Non-return Valve Location (Left) and Dismantled (Right)
e. The starting relay is defective. Contact Thorlabs Tech Support..
f. The protective thermal relay has switched off the compressor due to overheating. When cooled, the compressor
will automatically turn on again.
4.1.2. The compressor does not reach the maximum pressure
a. Check for air leaks (See section 4.1.5).
b. The air intake filter is clogged. Clean with compressed air, or replace it.
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