GEM 651 User Manual

651
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Fault Possible cause Fault clearance
Programming error No air supply during the programming
procedure
Ensure the air supply availability,
re-programme
Programming was deactivated before both
end positions were reached
(Manual programming mode)
Re-programme
Minimum stroke was not reached Adjust minimum stroke, re-programme
Sensor error Sensor limit exceeded Adjust minimum stroke (see Technical data),
re-programme
Note maximum stroke (see Technical data)
Internal error Memory error Re-programme
AS-Interface error Slave is addressed to zero Address the slave
No AS-Interface communication available Check AS-Interface net
11 Troubleshooting / Fault clearance
Fault Possible cause Fault clearance
Air escapes from ventilation hole
in the upper part
Control piston not sealing Replace actuator
Air escapes from hole on the
distance piece
Spindle sealing leaky Replace actuator and check control
medium for impurities
Medium escapes from the hole
on the distance piece
Valve diaphragm faulty Check valve diaphragm for damage,
if necessary replace diaphragm
Valve doesn't open or doesn't
open fully
Control pressure too low Operate valve with control pressure
specified in data sheet
Pilot valve faulty (for c.f. 1 + 3) Replace actuator
Control medium not connected Connect control medium
Valve diaphragm incorrectly
assembled
Disassemble actuator, check diaphragm
assembly, replace if necessary
Faulty actuator spring (for control
function 2, normally open)
Replace actuator
Valve leaks downstream (doesn't
close or doesn't close fully)
Media operating pressure too high Operate valve with operating
pressure specified in data sheet
Control pressure too low Operate valve with control pressure
specified in data sheet
Foreign matter between valve
diaphragm and valve body weir
Disassemble actuator, remove foreign
matter, check valve diaphragm and
valve body weir for damage and
replace if necessary
Valve body weir damaged Check valve body weir for damage,
if necessary replace valve body
Pilot valve faulty (for c.f. 2 + 3) Replace actuator
Valve diaphragm faulty Check valve diaphragm for damage,
if necessary replace diaphragm
Actuator spring wrong or faulty
(for control function 1, normally closed)
Replace actuator
Valve leaks between actuator and
valve body
Valve diaphragm incorrectly
assembled
Disassemble actuator, check diaphragm
assembly, replace if necessary
Bolting between valve body and
actuator loose
Tighten bolting between valve body
and actuator diagonally
Valve diaphragm faulty Check valve diaphragm for damage,
replace diaphragm if necessary
Valve body connection to piping
leaks
Valve body fitted incorrectly to piping Check installation of valve body in
piping
Valve body leaks Valve body faulty or corroded Check valve body for damage,
replace valve body if necessary

GEM 651 Specifications

General

Brand	GEM
Model	651
Category	Control Unit
Language	English