en
20
Installation and operating instructions • Wilo-Rexa PRO-S • Ed.01/2022-03
6.5.4
Connection of the three-phase AC
motor (3~ motor)
5
1
2
4
3
M 3~
gn-y
e
W
V
21
20
U
PE
6
DK
Fig. 7: Connection diagram 3~ motor: Bimet-
allic strip, direct starting
Wire
Designation Terminal
1, 2
20, 21
Thermal motor monitoring
3
U
L1
4
V
L2
5
W
L3
6
DK
Monitoring leakage motor compartment
Green/yellow (gn-ye) PE
Earth
•
Connection cable with bare cable ends.
•
Connection in the switchgear according to the connection diagram.
•
Mains connection with clockwise-rotating field
•
Thermal motor monitoring:
–
Sensor: Bimetallic strip
–
Number of temperature circuits: 1, temperature limiter
–
Connection values: max. 250 V(AC), 2.5 A, cos phi = 1
–
Threshold value: is set by sensor.
–
Triggering status: If the threshold value is reached, switch off the pump!
•
Monitoring leakage motor compartment:
The connection must be made via an evaluation relay (e.g. “NIV 101/A”).
–
Sensor: Electrode
–
Connection values: max. 250 V(AC), 2.5 A, cos phi = 1
–
Threshold: 30 kOhm
–
Triggering status: If the threshold value is reached, switch off the pump!
6.5.5
Optional equipment
Information on electrical accessory connection or possible special configurations. Please
refer to the order confirmation or configuration overview for details on the special config-
uration.
6.5.5.1 Connection of three-phase AC
motor (3~ motor) with PTC sensor
5
1
2
4
3
M 3~
gn-y
e
W
V
11
10
U
PE
6
DK
Fig. 8: Connection diagram 3~ motor: PTC
sensor, direct starting
Wire
Designation Terminal
1, 2
10, 11
Thermal motor monitoring
3
U
L1
4
V
L2
5
W
L3
6
DK
Monitoring leakage motor compartment
Green/yellow (gn-ye) PE
Earth
•
Thermal motor monitoring:
The connection must be made via an evaluation relay (e.g. “CM-MSS”).
–
Sensor: PTC sensors
–
Number of temperature circuits: 1, temperature limiter
–
Connection values: max. 30 V(DC)
–
Threshold value: is set by sensor.
–
Triggering status: If the threshold value is reached, switch off the pump!
6.5.5.2 Connection of thermal motor mon-
itoring as temperature control
Thermal motor monitoring is designed as temperature limiting (1 temperature circuit) as
standard. Optionally, the thermal motor monitoring can also be designed as temperature
control (2 temperature circuits):
•
If the low temperature threshold is reached, switch off the pump. The pump can be re-
started
automatically
.
•
If the high temperature threshold is reached, switch off the pump. Restarting
must be
carried out manually
!
