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TROUBLESHOOTING GUIDE (Cont.)
General Problem
LOSS OF FEEDBACK
Fault (LF) (Cont.)
Invalid Speed
Request Fault (In)
(Continued On Next Page)
Procedure
3. Defective Fiber Optic Re-
ceiver Module, cable or
transmitter
4. Defective volume booster
regulator or seized rotator
5. Current to Pressure Trans-
ducer disconnected or
defective
6. Defective Control Card
1. Speed setpoint set too high
on Speed Select Thumb-
wheel Switch (local mode)
or from remote analog input
(remote mode)
2. Defective Atomizer Card
(local mode)
3. Defective analog input
source (remote mode)
Solution
3. Check the red speed feedback LED located
on the Fiber Optic Receiver Module for the
channel in question. The LED should come
on if the turbine rotates when enabled.
If the LED does NOT come ON, disconnect
the fiber optic cable, enable the rotator and
look for a red light from the cable while the
rotator is spinning. If no light can be ob-
served, then replace the fiber optic cable.
If light is observed, then replace the fiber
optic receiver.
If the fiber optic cable is replaced and the
problem still exists, then replace the fiber
optic transmitter located on the rotator.
Hint: A fiber optic cable from an operational
rotator can be temporarily switched to a
different receiver input to help verify the
above.
4. Check Current to Pressure Transducer output
pressure. If it is increasing and rotator does
not spin, check volume booster regulator
and rotator for cause.
5. Verify electrical and pneumatic connections
to Current to Pressure Transducer for corre-
sponding rotator. If all items above are OK
and there is no output from the transducer,
then replace it.
6. If all items above are OK, replace the control
card.
1. Lower speed setpoint command.
2. Replace Atomizer Card.
3. Repair or replace input source.
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