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23
General installation data
7.3 Switches and sensors
All SE1 and SEV pumps have thermal protection
incorporated in the stator windings.
7.3.1 Thermal switch, PT 1000 and thermistor
(PTC)
Pumps without sensor
Pumps without sensor have a thermal switch or a
PTC thermistor.
Via the pump controller safety circuit, the thermal
switch will stop the pump by breaking the circuit in
case of overtemperature (approximately 150 °C).
The thermal switch will reclose the circuit after
cooling. For pumps equipped with a PTC thermistor,
connect the thermistor to either the PTC relay or the
IO module to break the circuit at 150 °C.
The maximum operating current of the thermal
switch is 0.5 A at 500 VAC and cos φ 0.6. The switch
must be able to break a coil in the supply circuit.
Pumps with sensor
Pumps with sensor have either a thermal switch and
a Pt1000 sensor or a PTC thermistor in the windings,
depending on the installation site.
Via the pump controller safety circuit, the thermal
switch or the thermistor will stop the pump by
breaking the circuit in case of overtemperature
(approximately 150 °C). The thermal switch or the
thermistor will reclose the circuit after cooling.
The maximum operating current of both the Pt1000
and the thermistor is 1 mA at 24 VDC.
To find out whether the pump is fitted with a thermal
switch or a PTC thermistor, measure the motor
winding resistance. See table below.
Non-explosion-proof pumps
When closing the circuit after cooling, the thermal
protection can restart the pump automatically via the
controller. Pumps from 4 kW and up sold in Australia
or New Zealand are fitted with a PTC thermistor.
Explosion-proof pumps
See electrical data in the IO 113 installation and
operating instructions.
7.3.2 WIO sensor
The WIO sensor measures the water content in the
oil and converts the value into an analog current
signal. The two sensor conductors are for power
supply as well as for carrying the signal to the IO
113. The sensor measures the water content from 0
to 20 %. It also sends a signal if the water content is
outside the normal range (warning), or if there is air
in the oil chamber (alarm).
The sensor is fitted in a stainless steel tube for
mechanical protection.
Fig. 16 WIO sensor
Supply voltage: 24 VAC ± 10 %
50 or 60 Hz
24 VDC ± 10 %
Supply current: Min. 2.4 A; max. 8 A
Power consumption: Max. 5 W
Ambient temperature: -25 to +65 °C
Enclosure class: IP20
Without
cable
With 10 m
cable
With 15 m
cable
Thermal
switch
< 50 mΩ < 320 mΩ < 390 mΩ
PTC
thermistor
> 100 mΩ > 370 mΩ > 440 mΩ
The thermal protection of explosion-proof
pumps must not restart the pump
automatically. This ensures protection
against overtemperature in potentially
explosive environments. In pumps with
sensor this is done by removing the short-
circuit between terminals R1 and R2 in the
IO 113.
Do not install the separate motor-
protective circuit breaker or control box
installed in potentially explosive
environments.
The IO 113 module must be configured to
stop explosion-proof pumps in case the
WIO sensor sends an alarm signal.
The pump must not restart automatically.
TM03 1561 1409
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