Product description
en
Installation and operating instructions Wilo-Rexa CUT GE
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4.1.3
Seal
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.
4.1.4
Material
▪ 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
4
▪ Seal on the fluid side: SiC/SiC
▪ Seal, static: NBR (nitrile)
4.2
Monitoring devices
Overview of monitoring devices:
P 13
Motor compartment
•
Motor winding: temperature limiter
(1-circuit temperature monitoring)
•
Motor winding: temperature controller
(2-circuit temperature monitoring)
o
Sealing chamber
o
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.
Sealing chamber monitoring
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 through pump control.
4.3
Operating modes
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.
Operating mode S3: Intermittent periodic duty
This operating mode defines a switching cycle in a combination of periods of operation
and standstill. Specified value (e.g. S3 25 %) relates to the operating time. The switch-
ing cycle has a duration of 10 min.
If two values (e.g. S3 25 %/120 s) are specified, the first value relates to the operating
time. The second value specifies the max. period of the switching cycle.
4.4
Operation with frequency con-
verter
Operation on the frequency converter is permitted. Refer to the appendix for the relev-
ant requirements!
