Action against high frequency interference, System malfunctions – Flowserve NRS1-40.1 User Manual
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Fault finding list for trouble shootin g system malfunctions: Control Unit
Action against high frequ ency interfe renc e
All connected inductive loads such as contactors and actuators must be provided with RC combinations in
accordance with the specifications of the manufacturer.
Should sporadic failures occur in installations susceptible to faults (e. g. malfunctions due to out-of-phase
switching operations) we recommend the following actions in order to suppress interferences:
HF interference suppression of voltage supply by means of ferrite rings and
HF interference suppression of CAN bus line by means of hinged-shell ferrite rings.
LED bus status is flashing slowly
Fault:
Faulty communication in the CAN bus system.
Remedy: Check 24 V bus supply, wiring, configuration of the limiter, node ID and baud rate
settings as well as terminating resistors. If modifications have to be made, switch off mains
voltage and switch it on again after about 5 seconds.
Fault:
No or faulty communication with limiters. The fault occurs at long intervals.
Remedy: There is a source of interference in the surrounding area. To suppress interferences provide
contactors and actuators with RC combinations in accordance with the specifications of the
manufacturer. Take action against high frequency interference.
LED bus status is illuminated
Fault:
The control unit must be defective because one or more of the self-checking routines de-
tected a malfunction, e. g. faulty output relay in the control unit, no or clock-pulse controlled
voltage applied across terminal 25.
Remedy: Switch off mains voltage and switch it on again after about 5 seconds (the equipment re-
starts). The control unit must be replaced if after a maximum of 1 minute a malfunction is
indicated again.
LED Power is flashing slowly
Fault:
Bus supply voltage below 18 V DC. The power supply unit of the controller is overloaded.
Remedy: Mount and connect a safety power supply unit (e. g. Siemens SITOP Power 05).
Fault:
Bus supply voltage below 18 V DC. Faulty wiring (short circuit).
Remedy: Check wiring. Switch off mains voltage and switch it on again after about 1 second (the
equipment restarts).