Thermal Switch, Pt1000 And Thermistor; Wio Sensor (Water-In-Oil Sensor); Fitting The Wio Sensor; Moisture Switch - Grundfos SL1 Serie Instructions D'installation Et D'utilisation

8.3 Thermal switch, Pt1000 and thermistor

All SL1 and SLV pumps have thermal protection incorporated in
the stator windings.
Pumps without sensor
Pumps without sensor have a thermal switch.
Via the pump controller safety circuit, the thermal switch will stop
the pump by breaking the circuit in case of overtemperature
(approx. 302 °F (150 °C)). The thermal switch will reclose the
circuit after cooling.
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 thermistor (PTC) 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 (approx. 302 °F (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.
Non-explosion-proof pumps
When closing the circuit after cooling, the thermal protection can
restart the pump automatically via the controller.
Explosion-proof pumps
Warning
FM
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 111.
See Electrical data in the IO 111 installation and
operating instructions.
Warning
FM
The separate motor-protective circuit breaker/
control box must not be installed in potentially
explosive environments.

8.4 WIO sensor (water-in-oil sensor)

The WIO sensor measures the water content in the oil and
converts the value into an analog current signal. The two sensor
leads are for power supply and for carrying the signal to the
IO 111. The sensor measures the water content from 0 to 20 %.
sIt 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. 12 WIO sensor

8.4.1 Fitting the WIO sensor

Fit the sensor next to one of the shaft seal openings. See fig. 12.
The sensor must be tilted into the motor's direction of rotation to
ensure that oil is led into the sensor. Make sure that the sensor is
submerged in the oil.
8.4.2 Technical data
Input voltage: 12-24 VDC
Output current: 3.4 - 22 mA
Power input: 0.6 W
Ambient temperature: 32 to 158 °F (0 to 70 °C)
See also the installation and operating instructions for IO 111 on
www.grundfos.com.

8.5 Moisture switch

All FM approved motors are fitted with a moisture switch as
standard, with the moisture switch being connected via the supply
cable. See 8. Electrical connection. The moisture switch must be
connected to a separate circuit breaker.
The moisture switch is positioned in the bottom of the motor. If there
is moisture in the motor, the switch will break the circuit and send a
signal to the IO 111.
The moisture switch is non-reversing and must be replaced after
use.
On sensor motors the moisture switch is connected in series with
the thermal switch and connected to the monitoring cable, and it
must be connected to the safety circuit of the separate pump
controller. See section 8. Electrical connection.
There is no moisture switch in CSA versions
Note
without sensor.
The motor-protective circuit breaker of the pump
controller must include a circuit which
automatically disconnects the power supply in
Caution
case the protective circuit for the pump is
opened.
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