Failure Diagnostics - Schulz Compact Serie Manual De Instrucciones

17. FAILURE DIAGNOSTICS

The list we present below simulates most possible problems and causes that may result in a halt or incorrect operation of the compressor.
Some procedures to solve the problems are simple, which allows the user, through the reading of the Electronic Interface display, to solve
them without the need of specialized Technical Assistance.
However, if the problem remains after the corrective actions described below, contact the nearest SCHULZ AUTHORIZED DEALER.
OCCASIONAL DEFECTS
Compressor will not start.
Note:
The compressor may be
powered down for the action
of the pressure switch and
will automatically start (if that
is the cause, the pressure is
high and the pressure switch
prevents the restart)
The compressor starts and
immediately turns off.
Overheating of the
compressor.
Intermittent noise at the start.
The contactors seem not to
activate.
PROBABLE CAUSES
Phase or electric power missing.
Voltage missing in the control.
Motor overload relay of the air end or fan tripped.
Overtemperature.
Thermal protector went off.
Coil of the contactors burnout.
Other causes: Wires with loose or broken contacts.
ON button defective.
Emergency stop button activated.
Overload relay tripped,
Installation not in compliance with the related standard
Phase missing
(installation fuse burnout)
Power supply cables of motor loose in the input
or output of the contactors.
Overload relay with defect or contact of contactors worn out.
Oil filter clogged.
Air filter clogged
Oil level low.
Compressor inlet filter clogged.
Radiator clogged.
Thermostatic valve not working.
Voltage drop in the power supply.
Installation not in compliance with the related standard.
Fan burnout.
Contactor of the fan defective.
Check the protection fuse and circuit breaker of the command.
With voltage on the command, the light (if it is ok) must turn
Reengaged it and check the cause by restarting
Wait for some minutes until going back to the ideal operating
temperature. Wait for some minutes until the voltage returns to
the command and light 8 turn on (Figure 11.1).
Check this component by following the wiring scheme; find
where the interruption that prevents the start of the compressor
Identify the cause, eliminate it and check the adjustment
Check the current and discrepancies between phases.
Check the cause and resize the cables if necessary.
Check the conditions of the cables and insulations and
Check the contacts of the contactors K1, K2, K3.
If they are good, observe the overload relay.
Check the cause and change the oil, using LUB SCHULZ/LUB
Request the presence of the Technical Assistance.
Recheck the dimensioning of the power supply cables,
observing the distance from the power supply (transformer).
Verify how much the voltage drops in the control at the moment
Check if there are no command wires loose.
Check the cause and eliminate it. If the problem persists,
request the presence of the Technical Assistance.
87
SOLUTION
Check the wiring and protection fuses.
on.
the compressor.
Check the coils of the contactors.
is located.
Unlock the button by turning it.
range of the relay.
Check if proper fuses are used.
Check the cause for the fuse burnout.
retighten them if necessary.
Replace it
Replace it
SCHULZ SYNTHETIC.
Replace it
Clean it.
of start.
Check discrepancy between the phases.