Flowserve NRS1-40.1 - Manual (Page 29)

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Emergency Operation
Emergency operation of water level limiting system LW
Provided that the control unit works with two level electrodes NRG 1x-40 (water level limiting system), if
one level electrode fails to operate the installation can continue to operate in emergency mode with one
level electrode under constant supervision according to TRD 401 and EN 12952 and EN 12953.
The following settings are required:
1. Set the wire link to the left in order to configure the working level electrode as device 1 and set the node
ID to "2" (see "Emergency Operation" in the installation manual of NRG 1x-40).
2. Control unit: Cut off power supply and unplug the lower terminal strip .
3. The terminal strip can be unplugged after undoing the right and the left fixing screws .
4. Set switch S1 of the code switch Fig. 4 to ON and S 2 to S 7 to OFF. The control unit NRS 1-40.1 has
now the node ID 1.
5. Set switches S1 and S 2 of the code switch Fig.4 to OFF.
6. Re-insert terminal strip and fasten the fixing screws .
■ Enter beginning of emergency operation in the boiler log.
■ An installation operating in emergency mode has to be constantly supervised!
■ Immediately replace faulty level electrode.
■ Enter end of emergency operation in the boiler log.
B
C
D
E
B C
Attention