Flowserve NRS 2-3 - Manual (Page 15)

15
Operation
Warning
The terminal strip of the NRS 2-3 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.
Note
The level switch NRS 2-3 can only be operated and checked in combination
with the level transmitter NRGT 26-1s.
During operation you have to correct the switchpoints if the following
malfunctions occur:
■ Pump is switched on and off too frequently
Increase the distance between the switchpoints
PUMP ON
and
PUMP OFF
. Turn the
adjustor to the right.
■ Signal
LOW LEVEL
too frequently
Raise the switchpoint
PUMP ON
or lower the switchpoint
LOW LEVEL
.
Turn the adjustor to the right or the adjustor for
LOW LEVEL
to the left.
■ Signal
HIGH LEVEL
too frequently
Raise the switchpoint
HIGH LEVEL
or lower the switchpoint
PUMP OFF
.
Turn the adjustor to the right or the adjustor to the left.
If it is not possible to make this rectification install a time relay to delay the signal
LOW LEVEL
by 2 to 20 sec.
Correct switchpoints
F
H I
E F
1. Check the measuring current coming from the level transmitter across the
terminals 5(+) and 6(–) in the case of design “b” and A22/C24 in the case of
design “c” and “d”.
Measuring current: 4 to 20 mA
Check power