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10. Electrical connection
10.1 Motor protection
Galvanic separation
Double-insulated sensors for high voltage measurements ensure
the electrical safety. There is an additional galvanic separation
inside the IO 113 module.
10.2 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.
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
PVS-3 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 must be chosen and
ordered separately.
10.2.1 Sensor options
•
Standard: leakage switch, moisture switch, Klixon or PTC in
each winding.
•
Sensor Set 1: leakage switch, moisture switch, Klixon or PTC in
each winding, Pt1000 on the stator.
•
Sensor Set 2: leakage switch, moisture switch, Klixon or PTC in
each winding, vibration sensor (PVS-3), Pt1000 on the stator,
lower- and upper bearing.
Note: As this pump range uses glycol (motor liquid SML3), it does
not have Water-in-Oil (WIO) or Water-in-Air (WIA) sensors. The
installation and operating instructions of the IO 113 and SM 113
modules refer to a WIA sensor, but there is no such sensor in this
pump range.
In the standard range, only the standard sensor package is
available. Pumps that require Sensor Set 1 or Sensor Set 2 are
Factory Product Variants (FPVs).
Any pump with Sensor Set 2 requires an SM 113 module. For
single-cable pumps, the SM 113 is mounted inside the motor top.
For dual-cable pumps, there are enough sensor wires in the cable
to allow the SM 113 to be mounted in the control box next to the IO
113.
Each cable has 5 sensor wires, which are connected to the sensor
wiring in the pump by a set of connectors. The female connector on
the cable side is plugged directly into the male connector on the
motor side. These connectors have 6 sockets. Depending on the
pump variant, each of these sockets can have a sensor wire from
the pump connected into it. This means that one of the sockets in
the male connector is not connected to any signal wire within the
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cable. There are redundant thermal protection switches in the
stator. The unused set of thermal protection switches are not
connected to the cable.
The wiring methods depend on the following:
•
which sensor set is used
•
number of power cables
•
PTC or Klixon
•
if the pump is an Ex version or not.
Please see the end of this document for the complete set of sensor
wiring diagrams.
Related information
17. Wiring and sensor information
10.2.2 Thermal switches
Three Klixon bimetallic thermal switches are built into the stator
windings. A contact opens in case of overtemperature (150 °C
[302 °F]). The motor insulation class is H (180 °C [356 °F]).
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.
Use a multimeter to check whether the circuit resistance is
maximum 3 Ω per thermal switch.
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
not working, install an automatic circuit breaker.
10.2.2.1 Stator thermal switches
Every stator in this SE/SL pump range has both the Klixon and the
PTC thermal switches wired into the stator. The only difference
between a pump using PTC or Klixon switches is how the thermal
switches are wired in the motor top, specifically in the 6-socket male
connector. The wiring diagrams in Section 13 show the 6-socket
connector.
The connector has 6 positions (sockets) that the sensor and switch
wires are connected into. Because there is only 5 sensor wires in
the cable, only the first 5 positions in the socket are connected to
the signal cable. This means that position 6 in the socket is blank, it
is not connected to any wire in the cable. As such, the unused set
of thermal switches, are connected to cable socket position 6.
In the wiring diagrams, the wires "TB" are for the Klixon and
wires "TP" are for the PTC switches. When PTC is used, 2TB1 is
plugged into socket Position 6. When Klixon is used, 2TP1 is
plugged into socket position 6.
PTC details
Grundfos part no
Thermik part no
96577415
110546
96650672
110363
98328968
113716
Klixon details
Grundfos part
Thermik part
no
no
96741587
111294
Related information
17. Wiring and sensor information
Rated temperature
[°C (°F)]
150 ± 5 (302 ± 41 °F)
150 (302 ± 41 °F)
160 (302 ± 41 °F)
Reclosing
Rated temper-
temp. below
ature [°C (°F)]
rated
temp. [°C (°F)]
150 ± 5 (302 ±
35 ± 15 (95 ±
41 °F)
59)
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