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4.7
Faults
Fault
Valve does not switch:
Valves switch with a
delay, or exhaust
through the venting
ports:
Leaking valve block:
Operating Instructions-No. 803 141
Possible cause
Operational voltage too low
or not present;
Manual override not in neu-
tral position;
Compressed air supply not
available or insufficient.
Compressed air supply not
available or insufficient;
Insufficient venting of the
exhaust channels due to
silencers that are too small
or are soiled (back-
pressure);
Impurities or foreign matter
in the pilot valve or main
valve.
O-rings between the modu-
les missing or damaged;
Missing or incorrectly posi-
tioned profile gaskets be-
tween the valve and the
baseplate.
Correction
Check the electrical supply
connections.
Ensure that the electrical power
supply is the same as that spe-
cified on the rating plate.
Set the manual override to the
zero position.
Carry out the dimensioning of
the compressed air connection
with volumes as large as possi-
ble (including that of upstream
pressure regulators, service
units, cut-off valves etc.)
Minimum operational
pressure ≥ ≥ ≥ ≥ ≥ 2 bar
Carry out the dimensioning of
the compressed air connection
with volumes as large as possi-
ble (including that of upstream
pressure regulators, service
units, cut-off valves etc.)
Minimum operational
pressure ≥ ≥ ≥ ≥ ≥ 2 bar
Use silencers or expansion
channels with sufficient
dimensions.
Clean soiled silencers.
Blast through the exhaust chan-
nels with pulsed compressed
air, to blow out impurities.
Install a new pilot or main valve
if these measures bring no
improvement.
Check for leaks and for missing
seals.
Install the missing seals and
replace damaged seals.
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