GEA T.VIS M-20 FDD, Operating Instruction, Page: 51 / 58

11 Alarms
11.1 Malfunctions and remedies
In the event of malfunctions immediately deactivate the valve and secure it
against inadvertent reactivation. Malfunctions may only be remedied by qualified
staff, who must observe the safety precautions.
Malfunction, signalling, cause, remedy
Malfunction Signalling Cause Remedy
Programming is not possible
after connection of the supply
voltage No LED is lit No voltage at connector (PIN 1
and 3)
Polarity of PINs 1 and 3 mixed
up
No voltage at L+ and L-
Polarity at L+ and L- mixed up Check the electrical
connections for correct wiring
Reset does not start Green or yellow Lift is activated Deactivate lift
After connecting the supply
voltage, green or yellow is
indicated immediately Green or yellow Unit has already been
programmed Start reset if necessary and
adapt the unit to the process
conditions
Valve opens very slowly Timeout in the PLC Fault in the compressed air
supply or filter clogged up Check the compressed air
supply
Clean or replace filters
Open the supply air throttles
further
Faulty feedback and
illumination at valve disk lift LED flashes yellow at valve
disk lift, green steady light is
expected
or
Green steady light at valve disk
lift, yellow flashing is expected DIP switch 4 not set correctly Check setting DIP switch 4
Programming cannot be
completed Flashing green 750ms / yellow
250ms
or
Flashing yellow 750ms / green
250ms Actuated positions cannot be
reached Check control pressure:
due to lack of control pressure
due to faulty fitting or incorrect
switch bar
Throttle settings are incorrect Observe the minimum pressure
on the type plate
Check and tighten the installed
adapter, see "Changing the
seals on base" (cross
reference), see
Check switch bar
Open the supply air throttle
further
Open the exhaust air throttle
further
No feedback signal is pending
at the PLC although one of the
actuated positions has been
reached Red LED flashing
or
Red LED permanently lit T.VIS M-20 is currently in
programming mode Wait until programming mode
has been completed
Green or yellow Feedback signals for the non-
actuated and actuated
positions to the PLC not
connected Check the electrical
connections for correct wiring
Alarms
Malfunctions and remedies
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