Faults - bürkert 6520 NAMUR Bedienungsanleitung

5 FAULTS

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Fault Possible cause
Insufficient or no
Valve does not
operating voltage;
switch:
Pressure supply insuffi-
cient or not present.
Pressure supply insuffi-
Valves switches
cient or not present;
delayed or
blows out from
the bleed ports:
Insufficient venting of
the exhaust channels
due to a silencer that is
soiled or is too small
(back pressure);
Soiling or foreign bodies
in the pilot or main valve.
1) In the case of version with reduced flow rate
(ID no. 141 721 Z; ID no. 141 72 S), the flow rate is reduced to 150 l/min.
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Remedy
Check the electrical
connetctions
Ensure the operating voltage is
as given on the rating plate
Implement the pressure supply
with as large a volume as pos-
sible (even for pilot devices
such as pressure regulators,
service units, shut-off valves,
etc.);
minimum operating pressure
≥ ≥ ≥ ≥ ≥ 2,5 bar,
minimum flow rate 270 l/min
at P connection of valve
Implement the pressure supply
with as large a volume as pos-
sible (even for pilot devices
such as pressure regulators,
service units, shut -off valves,
etc.);
minimum operating pressure
≥ ≥ ≥ ≥ ≥ 2,5 bar,
minimum flow rate 270 l/min
at P connection of valve
Use silencers or expansion
vessels with correspondingly-
large dimensions.
Clean soiled silencers.
Pressure load the exhaust
channels with pressure pulse to
blow away the dirt; Install a
new pilot or main valve if this
measure is unsuccessful.
6520 - 9
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