31 | Kato Engineering, Inc.
THIS IS TO ENSURE THAT FALSE DETECTION/FALSE TRIPPING DOES NOT OCCUR WHICH IS
VITAL FOR APPLICATIONS WHERE IT IS IMPARATIVE THAT THE GENERATOR SET DOES
NOT SHUT DOWN. BECAUSE OF THIS FEATURE/DESIGN PHILOSOPHY, THE RECEIVERS
MAY ON OCCASION ISSUE A “MALFUNCTION”. THERE IS NO NEED TO SHUTDOWN OR BE
ALARMED WITH THIS CONDITION. THIS IS ONLY TO ALERT THE USER THAT THEY SHOULD
MONITOR/CHECK THE GENERATOR SET FOR ABNORMAL OPERATING CONDITIONS OR
POTENTIAL KRM SYSTEM ISSUES.
5.4.3 Ground Fault
Ground fault protection can be set up help alarm during a rotor ground fault condition. The
programmable element for this feature is the ground fault resistance level (in kΩ). When this
condition occurs, the ground fault relay contact will close while the digital output will go low (~0V).
5.4.4 PWM Re-enable Time Limit
PWM signals are utilized from the controller by the inductive loop power amp stage in the receiver.
During a detected short circuit condition, the PWM signals are disabled for a period of time before
they are re-enabled. The programmable element for this is time (in seconds).
5.4.5 Loop Undervoltage
The loop undervoltage can be set to indicate a malfunction with either the loop driver or induction
loop antenna itself. If the loop voltage drops below the configured set point, the transmitter may not
have enough power available to operate properly. This failure will activate the malfunction feature.
The programmable elements for this fault are the loop undervoltage level (in volts) and time limit (in
seconds).
5.4.6 Loop Overcurrent
Loop overcurrent can be set to help protect the loop drivers located in the receiver. This failure will
activate the malfunction feature. The programmable element for this fault is the loop overcurrent
level (in amps).
5.4.7 Radio Link Error
The receiver has the ability to detect a link error when receiving data from the transmitter. This is
done by monitoring the number of bytes that should be received during the receive time. If too many
or too little bytes are detected, a radio link error will occur. This failure will activate the malfunction
feature.
5.4.8 Diode Fault
Diode fault monitoring is an optional feature that is accomplished through a rotor add-on diode fault
detector (DFD) device that monitors the rotating rectifier diodes. Under normal operating conditions,
with the rotating diodes and DFD functional, the DFD LED and DFD open-drain output will toggle at
about a 1 Hz rate. If the DFD indicates a diode fault, the DFD LED will stay on continuously and the
DFD open-drain output will be pulled low. If the DFD is not powered, not installed, or has
malfunctioned in some way, the DFD LED will remain off and the DFD open-drain output will be
pulled high (+24V).
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