Wilo HC 20.1 E3 Series - Page 47

Appendix en
Installation and operating instructions Wilo Motor HC 20.1 + EMU FA, Rexa SUPRA, Rexa SOLID 47
13.3.4 Electrical connection
DANGER
Risk of death due to electrocution!
Improper conduct when carrying out electrical work can lead to death due to electric
shock! Electrical work must be carried out by a qualified electrician in accordance
with the locally applicable regulations.
ƒ Always connect the pump to an electrical outlet outside the explosive area. If the
connection must be made within the explosive area, then the connection must be
carried out in an Ex-rated housing (ignition protection class according to
DINEN60079-0)! Non-observance may lead to fatal injury due to explosion! Con-
nection must always be carried out by a qualified electrician.
ƒ All monitoring devices outside the “spark-proof areas” must be connected via an in-
trinsically safe circuit (e.g. Ex-i relay XR-4...).
ƒ The voltage tolerance may not be higher than max. ±10%.
Overview of possible monitoring devices:
HC 20.1 HC 20.1 ...-E3
Internal monitoring devices
Terminal room/motor compartment
• •
Motor winding
• •
Motor bearings
o o
Sealing chamber
− −
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!
13.3.4.1 Monitoring of terminal room/mo-
tor compartment
The connection is made as described in the “Electrical connection” section.
13.3.4.2 Monitoring of motor winding
DANGER
Risk of explosion due to overheating of the motor!
If the temperature limiter is connected incorrectly, there is a risk of explosion due to
overheating of the motor! Always connect the temperature limiter to a manual re-
activation lock. This means that a “release button” must be manually activated!
The motor is equipped with a temperature limiter (1-circuit temperature monitoring).
When the threshold is reached, deactivation must occur with a restart interlock!
Connection of the thermal motor monitoring
Connect the PTC sensor via an evaluation relay. Relay “CM-MSS” is recommended for
this. The threshold is preset.
13.3.4.3 Leakage chamber monitoring
Connect the float switch using an evaluation relay! Relay “CM-MSS” is recommended
for this. The threshold is already pre-set.
13.3.4.4 Monitoring of motor bearing
The connection is made as described in the “Electrical connection” section.
13.3.4.5 Sealing chamber monitoring (ex-
ternal electrode)
ƒ Connect the external pencil electrode via an Ex-rated evaluation relay! Relay
“XR-4…” is recommended for this.
The threshold is 30kOhm.
ƒ The connection must be made using an intrinsically safe circuit!
13.3.4.6 Frequency converter operation
ƒ Type of converter: Pulse-width modulation