English (GB)
18
8.1 Sensors
The SE/SL pumps, 9-30 kW, can be equipped with a variety of
sensors for protection. The sensor specification table shows
which sensor types can be used for which pump types.
The wiring diagrams of the various types of sensor appear from
fig. 3 to fig. 8 in the appendix at the back of these installation and
operating instructions.
Sensor specification table
8.1.1 Thermal switches
Three bimetallic thermal switches (Klixon/PTC) are built into the
stator windings, and a contact will open in case of
overtemperature, i.e. 150 °C.
The supply voltage to the thermal switches must be 12-230 VAC.
The thermal switches are connected to the control cable, and
must be connected to the safety circuit of the separate pump
controller. See section 8. Electrical connection.
8.1.2 Moisture switches
Non-explosion-proof pumps have two moisture switches, which
are fitted in the upper and lower part of the motor compartment.
Moisture switches are motor protection devices which protect the
motor from damage due to moisture. The moisture switches are
non-reversing and must be replaced after they have been
released.
The moisture switches are connected to a separate circuit via the
control cable. See 8. Electrical connection. They must also be
connected to the safety circuit of the separate pump controller.
8.1.3 WIA sensor (water-in-air sensor)
The WIA sensor measures the water resistance and detects if
water is present. It also sends a signal if water is detected
(alarm). The sensor is fitted in a stainless steel tube for
mechanical protection.
Fig. 10 Water-in-air sensor
The sensor can be used together with Grundfos IO 113 or
SM 113, but it can also be used together with other controllers
with 4 to 20 mA inputs.
Together with IO 113, the sensor filters the signal and provides an
easy readout of the actual value. Furthermore, it is possible to set
a user-defined warning limit and calibrate the IO 113 and the
sensor to the motor liquid.
8.1.4 Thermistors
Thermistors are available as an accessory or as an FPV
(Factory Product Variant) option.
The thermistors can be used as motor protection devices to
monitor stator temperature instead of thermal switches and must
be connected to the thermistor relay in the control cabinet.
Checking after installation of pumps
1. Using a multimeter, check whether the circuit resistance is
< 150 Ω/thermistor.
2. Using a multimeter, check whether the insulation between
circuit and stator housing is outside the scale
(not measurable ).
3. Carry out a similar measurement at the end of the power
supply cable.
8.1.5 Pt1000 temperature sensor
The Pt1000 temperature sensor is available as an accessory or
as an FPV (Factory Product Variant) option.
The Pt1000 sensor is primarily used for the monitoring of bearing
temperature, but it can also be used in the stator.
The sensor resistance is
• 1000 Ω at 0 °C
• 1385 Ω at 100 °C
• approx. 1078 Ω at room temperature.
The temperature limits are:
• 90 °C: alarm for bearing temperature
• 130 °C: pump stop caused by high bearing temperature
• 150 °C: pump stop caused by high stator temperature.
Checking after installation of pump
1. Using a multimeter, check whether the resistance at room
temperature (20 °C) is approx. 1078 Ω.
2. Using a multimeter, check whether the insulation between
circuit and stator housing is outside the scale
(not measurable ).
3. Carry out similar measurements at the end of the power
supply cable.
During pump check, the Pt1000 sensor must be connected to a
recording device.
Standard pump
Sensor, pump
version 1
Sensor, pump
version 2
Klixon / PTC ●●●
Moisture switch, top ●●●
Moisture switch, bottom ●●●
WIA (water-in-air)
Pt1000 in stator winding ●●
Pt1000 in upper bearing ●
Pt1000 in lower bearing ●
PVS 3 vibration sensor ●
SM 113 ●
IO 113 ●
The motor-protective circuit breaker of the pump
controller must include a circuit which
automatically disconnects the power supply in
case the protective circuit for the pump is
opened.
The motor-protective circuit breaker of the pump
controller must include a circuit which
automatically disconnects the power supply in
case the protective circuit for the pump is
opened.
TM0 3 1164 1105 / TM0 3 1164 1105
Pos. Designation
1 Steel tube with sensor
2 Screen
3 Cable
The bearing temperature monitoring system is
only available as an accessory.
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