Flowserve NRS 1-7, Installation Instructions Manual, Page: 36 / 40

6
Apply mains voltage to level switch NRS 7.
Commissioning
Check that the NRS 7 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
"
should be permanently illuminated, Fig. 7 .
. Completely open valves of waterlevel gauge glass on steam boiler.
4. Fill boiler with feedwater ( cm above required level).
5. Decrease level in boiler until the level falls below low level. After the response delay has elapsed
the two red LEDs
0
on the level switch must light up.
If the automatic selfchecking test is initiated during this phase an alarm will only be raised after
twice the nominal delay period.
6. A lowlevel alarm can be simulated by pushing the button “TEST ”
!
with the electrode tip
submerged. Push the button until the response delay has elapsed. Both red LEDs
0
must light up.
7. The checking circuitry of the level switch can also be checked. Operate switch “TEST /Inspection”
9
in the direction of the arrow with the electrode tip submerged. After max. two minutes the two
red LEDs
0
should signal lowlevel alarm. The button “TEST ”
!
must
not
be operated during
this test
nor
must the level fall below the low level mark.
After the test return switch
9
into its original position. After the response delay the two red LEDs
0
must extinguish.
Lowlevel limiter
EN
EN