Installation and electrical connection
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Installation and operating instructions Wilo Motor T 12 ... 72 + EMU FA, Rexa SUPRA, Rexa SOLID
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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
11
High temperature connection
10
Centre terminal
12
Low temperature connection
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:
ƒ
Temperature limiter (1 temperature circuit):
The system must be deactivated when the threshold is reached.
ƒ
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!
6.5.4.5
Leakage chamber monitoring
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,
K21
Float switch connection
When the float switch is activated, a warning must be issued or deactivation must
take place.
6.5.4.6
Monitoring of motor bearing
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!
6.5.4.7
Monitoring of vibration occurring
due to operation
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!
6.5.4.8
Sealing chamber monitoring (ex-
ternal electrode)
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!
Summary of Contents for EMU FA
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