Franklin Electric CERUS X-DRIVE CXD-003A-4V, Installation And Operation Manual

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OPERATION
Protection Features
89
Transducer Redundancy
Transducer Redundancy allows two transducers to be wired to the VFD analog inputs and monitored simul -
taneously. The main transducer works as PID feedback, while the other is a spare (reserve). If the reading
from main transducer is abnormal, the reserved one replaces the main transducer.
With transducer redundancy, the VFD can detect transducer failure at low and maximum signal and switch
to the spare transducer.
For the spare transducer, it is recommended to use one with a range 1.5x or 2x larger than the main trans
-
ducer. For example, if the main transducer is 0-100PSI, the spare transducer can be 0-150PSI or 0-200PSI.
This will decrease the chance of both transducers being damaged by hydraulic surges.
If the main transducer reads a smaller value than the spare transducer with a difference more than 8% of the
main’s max value, the VFD will switch the PID feedback source to the spare transducer to decrease chance of
over pressurizing the system.
When VFD uses spare transducer as PID F/B source and both transducers read abnormal values, the VFD
will trip on Signal Loss fault.
NOTE: All other VFD features that use values as a percentage of the maximum feedback value (F/B Max)
will always use the main transducer’s range.
To enable Transducer Redundancy, adjust the following parameters:
PID F/B Source [SET-18]: Selects the analog input terminal for PID Feedback source for the main pressure
transducer. Select ACI or AVI1 input.
ACI Input Selection [IO–00] or AVI1 Input Selection [IO–05]: In the appropriate parameter (ACI or AVI1),
make sure input is set to the correct signal for the type of main transducer.
Spare AI Selection [IO-12]: Selects the analog input terminal for PID Feedback source for the spare pres -
sure transducer. Select ACI or AVI1 input.
Spare Max Value [IO-11]: Set to the spare transducer max range value.
PID F/B Unit [SET-19]: Select the units for the feedback signal, used for
PID F/B Max [SET-20]
and
Spare Max Value
[IO-11] .
ACI Loss Level [IO-02] or AVI1 Loss Level [IO-07]: Set both parameters to
2_Redundant
to allow the VFD to
set the maximum value and minimum feedback value to disable the main transducer and activate the spare
transducer.
•
In Spare Transducer Mode if the main transducer reading becomes normal, VFD will continue running
with the spare transducer until power is cycled.
ACI Loss Delay [IO-03] or AVI1 Loss Delay [IO-08]: Duration the ACI or AVI1 signal is in a loss condition
before initiating an ACI or AVI1 Loss Trip operation.