Wilo HC 20.1 E3 Series - Page 26

en Installation and electrical connection
26 WILO SE 2019-01
HC 20.1 HC 20.1 ...-E3
Leakage chamber
• •
Vibration sensor
− −
External monitoring devices
Sealing chamber
o o
Key: − = not available/possible, o = optional, • = as standard
All the monitoring devices fitted must always be connected!
6.5.4.1 Monitoring of terminal room/mo-
tor compartment
Connect the electrodes via an evaluation relay. Relay “NIV101/A” is recommended for
this. The threshold is 30kOhm.
Wiring diagram
DK
Electrode connection
The system must be deactivated when the threshold is reached!
6.5.4.2 Monitoring of motor winding
Connect the PTC sensor via an evaluation relay. Relay “CM-MSS” is recommended for
this. The threshold is preset.
PTC sensor wiring diagram
10, 11
PTC sensor connection
Triggering status of temperature limiter
When the threshold is reached, deactivation must take place. Note the additional in-
formation in the chapter on potentially explosive areas found in the appendix!
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 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.