Flowserve NRS1-8 - Manual (Page 16)

6
Apply mains voltage to level switch NRS -8.
Commissioning
Check that the NRS -8 and the associated level electrode are wired in accordance with the wiring
diagram, Fig. 10, Fig. 11.
Checking wiring
Apply mains voltage
Performance test
. Check length of electrode rod (see installation manual of the level electrode).
. When switching on the mains voltage the green LED
4
should be permanently illuminated, Fig. 7.
3. Completely open valves of water-level gauge glass on steam boiler.
4. Fill boiler with feedwater ( cm above low level).
5. Fill up with feedwater until the max. water level (high level) is exceeded.The two red LEDs of the
level switch 2 must light up after the response delay.
If the automatic self-testing routing is activitated at this point in time an alarm will only be raised
after twice the response delay has elapsed.
6. You can simulate a high level alarm by pressing the button “TEST I”
3 , with the electrode tip
submerged. Press and hold down the button until the response delay has elapsed. Both red LEDs
2 must then light up.
7. You can also test the self-checking circuitry of the level switch. With the electrode tip submerged,
operate test switch “TEST II/INSPECTION” 1 in the direction of the arrow. After max. two minutes
the two red LEDs 2 should signal high-level alarm. The button “TEST I” 3 must not be operated
during this test and the level must not fall below the low level mark.
After the test return switch 1 to its original position. After the response delay the two red LEDs 2
must extinguish.
High-level limiter