Troubleshooting - Schneider Airsystems UNM 580-15-90 DX Original Operating Manual

2.6.11 Cleaning/replacing the check
valve
1. Unscrew the locking screw (Figure 6a).
2. Clean insert, replace in case of damage,
squeezing or hardening.
3. Clean seat, replace complete check valve
if damaged.
2.6.12 Replacing the safety valve
1. Detach the safety valve (item 11) by un-
screwing it anticlockwise.
2. Apply Loctite® 243 to the thread of the
new safety valve or wind Teflon tape
around the valve.
3. Screw the new safety valve into place by
screwing it clockwise.
2.7 Decommissioning
2.7.1 Preservation
Oil-lubricated compressors: compressor is
taken out of service for a long period (over 6

2.8 Troubleshooting

Problem
A Protective motor
switch interrupts
power supply
B Pressure relief does
not function
C Compressor
not start when
switched on.
D Compressor starts
up briefly / buzzes
and then switches
off automatically
Cause
In case of malfunctions (e.g.
overheating;
extension cable too long or
with incorrect cross-section),
the protective motor switch is
tripped.
Power failure / undervoltage in
mains with
switched on
does Vessel pressure is higher than
switch-on pressure.
Power supply faulty.
Protective motor switch inter-
rupts power supply.
Pressure switch defective
Mains connection cable longer
than permitted or the cross
section is too small
months) or is new from the factory and will
not be operated until much later.
1. Replace oil with corrosion inhibitor oil
(viscosity SAE 30). See Chap. 2.6.7.
2. Allow the compressor to warm up, switch
it off, disconnect the power supply.
3. Drain the condensate, depressurise the
compressor.
4. Prior to returning to operation, replace
corrosion inhibiting oil with compressor
oil.
Store the compressor in a dust-free and dry
area where it is not exposed to high temper-
ature fluctuations.
2.7.2 Disposal
Dispose of the unit and packaging materials
according to applicable regulations.
Remedy
Switch off the compressor. Wait
low voltage; a short while. Actuate the protec-
tive motor switch is available.
Switch on the compressor.
Protective motor switch trips
again: switch off compressor.
Disconnect the power supply.
Contact the service partner
Switch off the compressor. It de-
compressor pressurises. Switch on the com-
pressor
Relieve pressure in the vessel
until the pressure switch is acti-
vated automatically.
Have the power supply checked
by a qualified person (service
partner).
See item A.
Have
changed by a qualified person.
Check connection cable length
and
Chap. 2.4.4)
UNM
the pressure
cable cross-section
GB
switch
(see
II/5