Sensors - Grundfos SE Serie Instrucciones De Instalación Y Operación

7.3 Sensors

The pumps can be equipped with various switches and sensors for
protection. The specification table below indicates which switch and
sensor types can be used.
For the wiring diagrams of the various switch- and sensor types ,
see section Appendix.
Switch and sensor specification
Thermal switches or PTC
Moisture switch
Leakage switch in leakage chamber for
standard motors
Leakage switch in stator housing, for Ex
motors
Pt1000 in stator winding
Pt1000 in upper bearing
Pt1000 in lower bearing
PVS3 vibration sensor
1
SM 113 module
2
IO 113 module
1
For pumps fitted with two power supply cables, the SM 113 module
must be ordered separately and installed in the control cabinet.
SM113 needs to be fitted with a resistor.
2
The IO 113 with communication functionality has to be chosen and
ordered separately.
Thermal switches
Three Klixon bimetallic thermal switches are built into the stator
windings. A contact opens in case of overtemperature (302 °F/150
°C). The motor insulation class is H (356 °F/180 °C).
The supply voltage to the thermal switches must be 12-24 V DC.
The thermal switches are connected to the control cable and must
be connected to the safety circuit of the separate pump controller.
Check whether the circuit resistance is maximum 3 Ω per thermal
switch, with a multimeter.
The motor-protective circuit breaker of the pump controller
must include a circuit which automatically disconnects the
power supply in case the protective circuit is opened.
In case the thermal switches or the moisture switches are
FM
not working, install an automatic circuit breaker.
7.3.1 Moisture switches and leakage switches
Non-Ex version:
One moisture switch and one leakage switch are mounted in a non-
Ex pump. The moisture switch is placed in the top cover and the
leakage switch is in the chamber above the shaft seal. See
Appendix.
Ex version:
One moisture switch and one leakage switch are mounted in an Ex
pump. The moisture switch is placed in the top cover and the
leakage switch is in the stator housing. See Appendix.
All switches in both non-Ex and Ex versions are hardwired from the
pump to IO 113. If moisture or a leakage is detected, they break an
electric circuit. This generates both a hardware and a software
alarm in IO 113, and the alarm relay opens.
Moisture and leakage switches are motor protection devices, which
● ● ● ● ● ●
protect the motor from damage due to moisture leakage. The
switches are non-reversing and must be replaced after they have
● ● ● ● ● ●
been released.
● ● ● The moisture and leakage switches are connected in a separate
circuit and to the control cable. See Appendix. They are also to be
connected to the safety circuit of the separate pump controller.
● ● ●
● ● ● ●
● ●
● ●
● ●
1 1
● ●
2 2
● ●
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