Burkert 6520 NAMUR, Operating Instructions Manual, Page: 32 / 50

31 Operating instructions no. 800 608
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
1)
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
1)
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.
6 Faults
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.
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