System malfunctions – Flowserve NRS1-40.1 User Manual
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Fault finding list for troubleshooting system malfunctions: Limiters 1 – 4
Depending on the indication of the malfunction press and hold down key 1 or 2 or 3 or 4.
LED 1 is flashing slowly
Fault:
The limiter (level electrode / temperature transmitter) and the control unit cannot commu-
nicate.
Remedy: Check 24V bus supply, wiring, configuration of the low level electrodes (wire links), node ID,
baud rate setting and terminating resistor. If modifications have to be made, switch off mains
voltage and switch it on again after about 5seconds.
Fault:
The limiter and the controller cannot communicate. 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.
LEDs 2 and 3 are flashing slowly
Fault:
The temperature in the terminal box of the level electrode or the temperature transmitter ex-
ceeds the max. limit.
Remedy: Check installation of electrode and insulate electrode flange against thermal radiation. Check
place of installation of the temperature transmitter.
LED 3 is flashing slowly
Fault:
One or more of the self-checking routines detected a malfunction, which means that the
electronic insert of the level electrode or the temperature transmitter is defective.
Remedy: Replace electronic insert.
Fault:
The temperature sensor is defective (parting of a cable, short circuit).
Remedy: Check temperature sensor and supply cables (see Installation Instructions TRV 5-40),
replace measuring element of the temperature sensor.