Burkert Type 5470 - Manual (Page 18)

16 - 5470 / MP05
I
NSTALLATION
, I
NITIALISATION AND
S
ERVICE
english
english
Faults
Faults
Valve does not switch:
Valve switch with a delay,
or exhaust through the
venting ports:
Leaking valve block:
Possible cause
Operational voltage too low or
not present;
Manual override not in neutral
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 modules
missing or damaged;
Missing or incorrectly
positioned flat seals between
the valve and the baseplate.
Correction
Check the electrical supply connections.
Ensure that the electrical power supply
is the same as that specified 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 possible (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 possible (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 channels 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.