Operating Modes; Operation With Frequency Converter; Operation In An Explosive Atmosphere - Wilo HC 20.1+EMU FA Instrucciones De Instalación Y Funcionamiento

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4.3

Operating modes

4.4 Operation with frequency con-
verter
4.5 Operation in an explosive atmos-
phere
14
Product description
Monitoring of motor winding
The thermal motor monitoring protects the motor winding from overheating. Temperature
limiter with PTC sensor is fitted.
External monitoring of the sealing chamber
The sealing chamber can be equipped with an external pencil electrode. The electrode regis-
ters fluid ingress through the mechanical seal on the fluid side. An alarm or deactivation of
the pump can therefore take place through the pump control.
Leakage chamber monitoring
The leakage chamber is equipped with a float switch. The float switch registers fluid ingress
through the mechanical seal on the motor side. An alarm or deactivation of the pump can
therefore take place through the pump control.
Monitoring of motor bearing
The thermal monitoring of the motor bearing protects the roller bearings against overheat-
ing. Pt100 sensors are used for temperature measurement.
Operating mode S1: Continuous duty
The pump can operate continuously at the rated load without exceeding the permissible
temperature.
Operating mode: Non-immersed operation
The "non-immersed operation" operating mode describes the possibility of the motor
emerging during the drainage pumping sequence. This allows a further lowering of the water
level as far as the upper edge of the hydraulics. Observe the following points during non-
immersed operation:
▪ Operating mode: Continuous duty (S1).
▪ Max. fluid and ambient temperature: The max. ambient temperature corresponds to the
max. fluid temperature shown on the rating plate.
Operation on the frequency converter is permitted. Refer to the appendix for the relevant
requirements!
ATEX approval
FM approval
CSA-Ex approval
Key: − = not available/possible, o = optional, • = as standard
For use in explosive atmospheres, the pump must be marked as follows on the rating plate:
▪ "Ex" symbol for the relevant approval
▪ Ex classification
For the relevant requirements, refer to the explosion protection chapter in the appendix
of these installation and operating instructions!
ATEX approval
The pumps are suitable for operation in potentially explosive atmospheres:
▪ Device group: II
▪ Category: 2, zone 1 and zone 2
These pumps must not be used in zone 0!
FM approval
The pumps are suitable for operation in potentially explosive atmospheres:
▪ Protection class: Explosionproof
▪ Category: Class I, Division 1
HC 20.1
o
o
−
HC 20.1 ...-E3
o
−
−
WILO SE 2019-01