Wilo FKT 50.1 - Page 28

en Installation and electrical connection
28 WILO SE 2019-01
6.5.4.3 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.
6.5.4.4 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!
6.5.4.5 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!
6.5.4.6 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!
Note the additional information in the chapter on potentially explosive areas found
in the appendix!
6.5.5 Motor protection adjustment
Motor protection must be set depending on the selected activation type.
6.5.5.1 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.
6.5.5.2 Star-delta activation
The motor protection setting depends on the installation:
ƒ Motor protection installed in the motor line: Set the motor protection to 0.58xthe
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 3seconds.
6.5.5.3 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 30s.
ƒ To avoid power dissipation, bypass the electronic starter (soft start) once normal op-
eration is reached.
6.5.6 Operation with frequency con-
verter
Operation on the frequency converter is permitted. Refer to the appendix for the relev-
ant requirements!