Faults - Burkert 6520 NAMUR Instructions De Service

5 FAULTS

Fault
Valve does not
switch:
Valves switches
delayed or
blows out from
the bleed ports:
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.
Possible cause
Insufficient or no
operating voltage;
Pressure supply insuffi-
cient or not present.
Pressure supply insuffi-
cient or not present;
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.
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.
1)
1)
6520 - 9