Flowserve NRS 2-5 - Manual (Page 11)

11
Switch on mains supply. The green LED is illuminated. Fig. 4
NRS 2-5 c/d
1. After switching on the mains voltage the green LED must be permanently
illuminated. Fig. 4
2. Lower the water level until it falls below the low-level mark.
The red LED at the level switch must light up.
3. Raise the water level until it exceeds the low-level mark. The red LED must
extinguish.
4. After removing the terminal box from the level electrode the yellow LED must
light up (malfunction in connecting wire).
5. Bridge terminals C16 and C18. The yellow LED must light up (malfunction in
electrode).
The measuring voltages of the different operating modes are represented in table 1.
Commissioning
Check whether the NRS 2-5 and the associated system component NRG 211 are
wired according to the wiring diagram. Fig.1, Fig. 2
Check wiring
Apply mains voltage
Functional test
Table 1
Measuring voltage U
M
Decoded
≤
1 V
Malfunction in electrode supply cable
(short circuit, interruption)
1 V – 4 V Electrode exposed, low level
4 V – 7 V Electrode submerged
≥
9 V
Malfunction in electrode (defective insulating seal,
leaking stuffing box)
4
4
3
1
2