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4.1.2
Motor
4.1.3
Seal
4.1.4
Material
4.2
Monitoring devices
4.3
Operating modes
136
Product description
The system is driven by surface-cooled motors in three-phase current version. The mo-
tor is cooled by the fluid around it. The waste heat is transferred directly to the fluid or
the ambient air via the motor housing. The motor may emerge during operation. The
connection cable is longitudinally watertight and has bare cable ends.
The seal for the fluid and the motor compartment is made via two mechanical seals. The
sealing chamber between the mechanical seals is filled with medical white oil.
▪ Pump housing: EN-GJL-250 (ASTM A48 Class 35/40B)
▪ Impeller: EN-GJL-250 (ASTM A48 Class 35/40B) or EN-GJS-500-7
(ASTM A536 70-50-05)
▪ Macerator: Abrasit/1.4034 (AISI 420C)
▪ Motor housing: EN-GJL-250 (ASTM A48 Class 35/40B)
▪ Shaft: 1.4401 (AISI 316)
▪ Seal on the motor side: C/MgSiO
▪ Seal on the fluid side: SiC/SiC
▪ Seal, static: NBR (nitrile)
Overview of monitoring devices:
Internal monitoring devices
Motor compartment
Motor winding: Temperature limiter
(1-circuit temperature monitoring)
Motor winding: Temperature controller
(2-circuit temperature monitoring)
External monitoring devices
Sealing chamber
Key: − = not available/possible, o = optional, • = as standard
All the monitoring devices fitted must always be connected!
Monitoring of motor compartment
The motor compartment monitoring protects the motor winding from short-circuits.
The moisture is measured by an electrode.
Monitoring of motor winding
The thermal motor monitoring protects the motor winding from overheating. Temper-
ature limiter with bimetallic strip is fitted as standard. As an option, the temperature
can also be measured as follows:
▪ With PTC sensors
▪ As a temperature controller
This allows two temperatures to be measured. When the low temperature is reached, an
automatic reactivation can be initiated after the motor has cooled. When the high tem-
perature is reached, the unit is forced to deactivate with reactivation lock.
External monitoring of the sealing chamber
The sealing chamber can be equipped with an external pencil electrode. The electrode
registers fluid ingress through the mechanical seal on the fluid side. An alarm or deac-
tivation of the pump can therefore take place by pump control.
Operating mode S1: Continuous duty
The pump can operate continuously at the rated load without exceeding the permiss-
ible temperature.
Operating mode S2: Short-time duty
The maximum operating period is specified in minutes, e.g. S2-15. The pause must last
until the machine temperature no longer differs from the temperature of the coolant by
more than 2 K.
4
P 13
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WILO SE 2019-02
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