Pump Controllers; Thermal Switch, Pt1000 And Thermistor - Grundfos SL1 Manual De Instrucciones

F1
F3
Q1
M
M1
3~
Fig. 12 Motor protection wiring diagram

9.2 Pump controllers

SL1 and SLV pumps can be connected to a separate controller for
level control. Controllers are available as accessories:
• Grundfos DC pump controller for one-pump installations
• Grundfos DCD pump controller for two-pump installations
• Simplex controller, SLC, for one-pump installations
• Duplex controller, DLC, for up to six-pump installations.
For further information on controllers, please see the installation
and operation instructions for the selected controller or go to
www.us.grundfos.com.

9.3 Thermal switch, Pt1000 and thermistor

All SL1 and SLV pumps have thermal protection incorporated in
the stator windings.
Pumps without WIO sensor
Pumps without WIO 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  0.6. The switch must be able to break a coil in
the supply circuit.
1
F2
S1
Q1
ON
F3
S2
OFF
B1
PE
B2
Q1
2
S1
S2
F1 + F2
F3
Q1
B1 + B2
M1
Pumps with WIO sensor
Pumps with WIO 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.
On switch
Off switch
Fuse
Motor protection switch
Contactor
Thermal switch in motor
Motor
17