Grundfos SE1 50 Notice D'installation Et De Fonctionnement page 20

6.2 Pump controllers
SE1 and SEV pumps can be connected to the
following Grundfos pump controllers for level
control:
• LC 231 or LC 241
• Grundfos DC and DCD.
For further information on controllers, see the
installation and operation instructions for the
selected controller or go to www.us.grundfos.com.
6.3 Thermal switch, Pt1000 and
thermistor
All SE1 and SEV pumps have thermal protection
incorporated in the stator windings.
Related information
10. Fault finding
6.3.1 Pumps with WIO sensor
Pumps with a WIO sensor have either a thermal
switch and a Pt1000 sensor or a PTC thermistor
in the windings, depending on the installation site.
Through the pump controller safety circuit, the
thermal switch or the thermistor stops the pump
by breaking the circuit in case of overtemperature
(approximately 302 °F [150 °C]). The thermal
switch or the thermistor closes the circuit after
cooling.
The maximum operating current of both the
Pt1000 and the thermistor is 1 mA at 24 VDC.
6.3.2 Explosion-proof pumps
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
a sensor, this is done by removing the
short circuit between terminals R1 and
R2 in the IO 113.
FM
The separate motor-protective circuit
breaker or controller must not be
installed in potentially explosive
environments.
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6.4 Water-in-oil sensor
The water-in-oil (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 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.
WIO sensor
Related information
6.4.1 Fitting the WIO sensor
Fit the sensor next to one of the shaft seal
openings. 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.
6.4.2 Technical data
Input voltage:
Output current:
Power input:
Ambient
temperature:
See also the installation and operating
See Electrical
instructions for IO 113 on www.grundfos.us.
data in the
installation and
6.5 Moisture switch
operating
instructions for IO
All pumps are fitted with a moisture switch as
113
standard, with the moisture switch being
connected through the supply cable, and
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connected to a separate circuit breaker.
net.grundfos.com/
qr/i/98097396 The moisture switch is positioned in the bottom of
the motor. If there is moisture in the motor, the
switch breaks the circuit and sends a signal to the
IO 113.
The moisture switch is non-reversing and must be
replaced after use.
The moisture switch is connected to the control
cable and must be connected to the safety circuit
of the separate pump controller.
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2
1
6.3.1 Pumps with WIO sensor
12-24 VDC
3.4 - 22 mA
0.6 W
32-158 °F (0-70 °C)