Schneider Airsystems SEM 255-10-50 W Notice D'utilisation D'origine page 31

Problem
B Pressure relief does
not function
C Compressor
not start when
switched on.
D The compressor
starts up briefly
when the switch-on
pressure is reached
or hums,
switches off auto-
matically.
E Compressor
continuously.
F During operation,
compressed
escapes via
load-relieving valve.
G After the switch-off
pressure is reached,
compressed
escapes via
load-relieving valve
until switch-on
pressure is reached
H Compressor
switches on
quently.
Cause
The pressure relief is shut
down by an interruption of the
power supply or voltage drop in
the mains when the compres-
sor is 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.
then
runs Intake filter badly contami-
nated.
Air consumption of compressed
air tools is too high.
Leakage at compressor.
Excessive condensate in the
vessel.
Compressed air line leaky:
Condensate drain valve is open
or missing.
Load-relieving valve leaky.
air
the
Check valve insert leaky or
defective.
air
Check valve is damaged.
the
Excessive condensate in the
fre- pressure vessel.
Compressor overloaded.
Remedy
Switch off the compressor. It de-
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 the pressure
changed by a qualified person.
Check connection cable length
and cable cross-section
Chap. 2.4.4)
Clean or replace intake filter.
Check the air consumption of the
tools. Contact the service partner
Locate leak, contact service part-
ner.
Drain the condensate
Chap. 2.6.5).
Check compressed air line, plug
leak.
Close or replace.
Clean or replace load-relieving
valve.
Clean or replace the check valve
insert (see Chap. 2.6.10).
Replace check valve.
Drain the condensate
Chap. 2.6.5).
See item E
GB
SEM
switch
(see
(see
(see
II/13