Operation &
Maintenance Manual
Pump
RW
782-001-GB
HSC
08-W36
Edition 4
23/32
9.
OPTIONS
9.1
Waterdetector
As a safeguard against water ingress into the motor, the
pump can be equipped with a waterdetector.
When your pump is equipped with a waterdetector, this
can be found on the dataplate.
See appendix 1: at position 24 a “W” is stamped.
The waterdetector detects water which might have
entered the oilhousing or motorhousing due to seal
failure or cable damage.
The waterdetector causes the pump to switch off,
before damage to the motor is done.
The probe itself is a non-active electrode, placed in oil
and motorhousing. It is used in conjunction with a relay in
the control circuit that measures the resistance between
probe and frame.
If only air or oil is present, the resistance is over
5000 Ohm. If water enters, the resistance will
decrease to as low as 300 to 500 Ohm.
We advise to use OMRON relay 61 F-GP
or an equivalent.
This relay switches at 5000 ohm.
No water present:
-
high resistance between terminals 1and 7
(>5000 Ohm)
-
terminals 2 and 4 closed
-
terminals 3 and 4 open
Water present:
-
low resistance between terminals 1 and 7
(300-500 Ohm)
-
terminals 2 and 4 open
-
terminals 3 and 4 closed
9.2 Thermoswitches
Thermoswitches are standard for the RW60and RW80
pumps and optional for the RW20 and RW40 pumps.
When your pump is equipped with thermoswitches,
a “T” is stamped at position 24 on the dataplate.
(see appendix 1). A copy of your dataplate is on page 2.
For connection values see par. 5.4.
9.3 Thermistors
Instead of thermoswitches, the pump can be equipped
with thermistors (on special request).
This will be marked with a “U” on the dataplate at
position 24 .
Normally the resistance is about 200-500 Ohm.
When the switch-off temperature is reached the
resistance will be between 1650-4000 Ohm.
The maximum voltage is 7.5V.
A thermistor is not a circuit breaker but a
resistance.
Fig. 9.1
electrode
frame
oil
water
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