Flowserve NRS 2-4 - Manual (Page 11)

11
Commissioning
Warning
The terminal strip of the NRS 2-4 is live during operation. This presents the
danger of electric shock.
Cut off power supply before removing or inserting the 19" slide-in unit or
undertaking any kind of installation or maintenance work.
Please note
The level switch NRS 2-4 can only be operated and checked in
combination with the level electrode NRG 211-1.
Check wiring
1. Check whether the 19" slide-in unit has been properly installed in the magazine.
2. Check whether the mains supply corresponds to the wiring carried out on
the equipment.
Apply mains voltage
1. Switch on the mains supply and check whether the mains voltage is applied
across the device. The LED is provided for visual check. B
Check switching functions
1. Check the switching function
HIGH LEVEL
. To assist with this objective raise the water
level in the tank above the preset high level. The LED located at the NRS 2-4
must light up and the corresponding function in the secondary circuit must be
operated.
2. Lower the water level. The level switch NRS 2-4 must switch back to normal
operation.
E
Check voltage
1. Check the supply and measuring voltage of the level electrode. The voltages can
be measured at the electrode or level switch. Fig. 3.
Supply voltage:
12 V DC
Measuring voltage: see table 1 – measuring voltage on page 12