Wilo EMU KS 5 Ex Notice De Montage Et De Mise En Service page 228

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6.5.5.2 Sealing chamber monitoring (ex-
ternal electrode)
6.5.6 Motor protection adjustment
6.5.6.1 Direct activation
6.5.7 Operation with frequency con-
verter
228
Installation and electrical connection
Wiring diagram for bimetallic strip
Temperature limiter
Bimetallic strip connection
20
21
Temperature control
High temperature connection
21
Centre terminal
20
Low temperature connection
22
With PTC sensor
Connect the PTC sensor via an evaluation relay. Relay "CM-MSS" is recommended for
this. The threshold is preset.
PTC sensor wiring diagram
Temperature limiter
PTC sensor connection
10
11
Temperature control
High temperature connection
11
Centre terminal
10
Low temperature connection
12
Triggering status with temperature control and limiting
Depending on the version of the thermal motor monitoring, the following triggering
status must occur when the threshold value is reached:
▪ Temperature limiting (1 temperature circuit):
When the threshold is reached, deactivation must take place.
▪ Temperature control (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 chapter on potentially explosive areas found
in the appendix!
Connect the external electrode via an evaluation relay. Relay "NIV 101/A" is recommen-
ded for this. The threshold is 30 kOhm.
When the threshold is reached, a warning must be given 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!
Motor protection must be set depending on the selected activation type.
At full load, set the motor protection switch to the rated current (see rating plate). At
partial load, it is recommended to set the motor protection switch 5 % above the cur-
rent measured at the duty point.
Operation on the frequency converter is not permitted.
WILO SE 2018-05