en Installation and electrical connection
76 WILO SE 2019-10
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!
6.5.6.2 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.
6.5.6.3 Monitoring of motor bearing
Connect the Pt100 sensor via an evaluation relay. Relay “DGW2.01G” 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!
6.5.6.4 Sealing chamber monitoring (ex-
ternal electrode)
Connect the external electrode via an evaluation relay. Relay “NIV101/A” is recommen-
ded for this. The threshold is 30kOhm.
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!
6.5.7 Motor protection adjustment
Motor protection must be set depending on the selected activation type.
6.5.7.1 Direct activation
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.
6.5.7.2 Star-delta activation
The motor protection setting depends on the installation:
ƒ Motor protection installed in the motor line: Set the motor protection to 0.58xthe
rated current.
ƒ Motor protection installed in the mains supply cable: Set the motor protection to the
rated current.
The maximum start-up time in star connection is 3seconds.
6.5.7.3 Soft starter
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. The following points must also be observed:
ƒ Power consumption must always be below the rated current.
ƒ Complete starting and stopping within 30s.
ƒ To avoid power dissipation, bypass the electronic starter (soft start) once normal op-
eration is reached.
6.5.8 Operation with frequency con-
verter
6.5.8.1 Asynchronous motor
It is possible to operate asynchronous motors at the frequency converter. The fre-
quency converter must feature the following connections at a minimum:
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