Flowserve NRS 1-40 - Manual (Page 20)

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System Malfunction 4
System Malfunctions
– continued –
LED 4 flashes slowly.
A malfunction in the level switch has
been detected.
LED 4 flashes slowly
Fault: The electronic circuit board of the level switch is defective (e. g. output
relay).
Remedy: Replace level switch. Restart system.
LEDs 1 to 4 flash rapidly.
A general communication
malfunction has been detected.
System Malfunction 5
LEDs flash rapidly
Fault: No communication between bus devices possible.
Remedy: Check wiring, node ID, baud rate setting and bus cable.
Cut off power supply and re-start system after 5 sec.
Fault: No voltage across terminal 25, self-checking routine unsuccessful.
Remedy: Wire NRS 1-40 as first device in the safety chain.
Wire NRS 1-40 according to wiring diagram (ensure constant voltage
supply across terminal 25). Restart system.
Fault: Voltage across terminal 26 and/or 30.
Remedy: Do not connect these terminals.