Wilo -Flumen EXCEL-TRE 20 Installation And Operating Instructions Manual page 64

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6.5.4.4 Sealing chamber monitoring (ex-
ternal electrode)
6.5.5 Motor protection adjustment
6.5.5.1 Direct activation
6.5.5.2 Star-delta activation
64
Installation and electrical connection
Wiring diagram for bimetallic strip
20 Centre terminal
22 Low temperature connection
With PTC sensor
Connect the PTC sensor via an evaluation relay. "CM-MSS" relay is recommended for
this purpose.
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
Trigger status for temperature controller and limiter
The installed sensor specifies the trigger temperature as part of thermal motor monit-
oring using bimetallic or PTC sensors. Depending on the thermal motor monitoring ver-
sion, the following triggering status must occur when the trigger temperature is
reached:
ƒ
Temperature limiter (1 temperature circuit):
The unit must be deactivated once the trigger temperature has been reached.
ƒ
Temperature controller and limiter (2 temperature circuits):
Once the trigger temperature for the low temperature is reached, the motor can de-
activate with automatic reactivation. Upon reaching the trigger temperature for the
high temperature limit, the motor must deactivate with manual reactivation.
Note the additional information in the section on potentially explosive areas de-
scribed 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.
Once the threshold is reached, a warning must be output or the unit must be
switched off.
Note the additional information in the section on potentially explosive areas in the
appendix!
CAUTION
Connection of the sealing chamber control
If, on reaching the threshold, there is only a warning, the mixer may be irreparably
damaged by the water ingress. Deactivation of the mixer is always recommended!
ƒ
Full load
Set the motor protection to the rated current according to the rating plate.
ƒ
Partial load operation
Set the motor protection to 5 % above the current measured at the duty point.
ƒ
The motor protection setting depends on the installation:
–
Motor protection in the motor line: Set the motor protection to 0.58 x rated cur-
rent.
–
Motor protection installed in the mains supply cable: Set the motor protection to
the rated current.
ƒ
The maximum start-up time in the star connection: 3 s
WILO SE 2021-10