Faults - Burkert 6520 NAMUR Instructions De Service

6

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.
Ident. numbers for apparatus with Profibus-PA-connection are available on request
Operating instructions no. 800 608
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 mea-
sure is unsuccessful.
1)
1)
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