Flowserve NRS1-40.1 - Manual (Page 21)

21
System Malfunctions
Causes
Malfunctions occur if CAN bus components have been mounted or configured incorrectly or if electronic
component parts are defective, or in the event of excessive heat in the equipment or electrical interference
in the supply system.
Further malfunctions are:
■ Faulty communication within the CAN-Bus system
■ Overloading of the 24V power supply unit in the controller
Before carrying out the systematic fault finding procedure please check:
Wiring:
Is the wiring in accordance with the wiring diagram?
Is the polarity of the bus line always correct?
Is the bus line of each of the end nodes provided with a 120
Ω resistor?
Configuration of level electrode NRG 1x - 40 (low water level LW):
Are the wire links (device 1 or 2) set correctly?
Does the position of the wire link tally with the node ID?
Configuration of the temperature transmitter TRV 5-40
Is the transmitter correctly adjusted as device 1, 2, 3 or 4?
Node ID:
Are the node IDs set correctly?
Note that a node ID must only be used for one item of equipment!
Baud rate:
Is the length of the cable in accordance with the adjusted baud rate?
Is the baud rate the same for all devices?
The terminal strips of the control unit NRS 1-40.1 are live during operation.
This presents the risk of severe cases of electric shock!
Always cut off power supply to the equipment before mounting, removing or connecting
the terminal strips! When the CAN bus is interrupted during operation an alarm will be raised.
Note
Dange r