Wilo T 12 Notice De Montage Et De Mise En Service page 93

6.5.4.5 Leakage chamber monitoring
6.5.4.6 Monitoring of motor bearing
6.5.4.7 Monitoring of vibration occurring
due to operation
6.5.4.8 Sealing chamber monitoring (ex-
ternal electrode)
Installation and operating instructions Wilo Motor T 12 ... 72 + EMU FA, Rexa SUPRA, Rexa SOLID
Installation and electrical connection
With PTC sensor
Connect the PTC sensor via an evaluation relay. Relay "CM-MSS" is recommended for
this. The threshold has been preset.
PTC sensor wiring diagram
Temperature limiter
10, 11 PTC sensor connection
Temperature controller and limiter
High temperature connection
11
Centre terminal
10
Low temperature connection
12
Triggering status for temperature controller and limiter
Depending on the version of the thermal motor monitoring, the following triggering
status must occur when the threshold value is reached:
▪ Temperature limiter (1 temperature circuit):
The system must be deactivated when the threshold is reached.
▪ Temperature controller and limiter (2 temperature circuits):
When the threshold for the low temperature is reached, the motor can deactivate with
automatic reactivation. When the threshold for the high temperature limit is reached,
the motor must deactivate with manual reactivation.
Note the additional information in the section on potentially explosive areas in the
appendix!
The float switch is equipped with a potential-free normally closed contact. The switch-
ing capacity can be found in the supplied connection diagram.
Wiring diagram
K20, Float switch connection
K21
When the float switch is activated, a warning must be issued or deactivation must
take place.
Connect the Pt100 sensor via an evaluation relay. Relay "DGW 2.01G" is recommended
for this. The threshold is 100 °C (212 °F).
Wiring diagram
T1, T2 Pt100 sensor connection
When the threshold is reached, deactivation must take place!
Connect the vibration sensor via a suitable evaluation relay. For more precise details on
connection of the vibration sensor, see the installation and operating instructions of
the evaluation relay.
The limit values must be set during commissioning and recorded in the commission-
ing log. When the threshold is reached, deactivation must take place!
Connect the external electrode via an evaluation relay. Relay "NIV 101/A" is recommen-
ded for this. The threshold is 30 kOhm.
Once the threshold is reached, a warning must be output or the unit must be
switched off.
CAUTION
Connection of the sealing chamber control
If on reaching the threshold, there is only a warning, the pump could be irreparably
damaged by the water ingress. Deactivation of the pump is always recommended!
Note the additional information in the chapter on potentially explosive areas found
in the appendix!
en
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