Product description
en
Installation and operating instructions Wilo-Rexa CUT GI
9
ƒ
Fluids containing hard components (such as stones, wood,
metal, etc.)
ƒ
Fluids containing large quantities of abrasive contents (e.g.
sand, gavel)
Intended use also includes compliance with this manual. Any other
use is regarded as non-compliant with the intended use.
4
Product description
4.1
Design
Submersible sewage pump with internal macerator as a submers-
ible monobloc unit for intermittent operation in wet well installa-
tion.
1
5
6
3
4
2
Fig. 1:
Overview
1
Handle/attachment point
2
Motor housing
3
Seal housing
4
Pressure connection
5
Hydraulics housing
6
Power supply cable
4.1.1
Hydraulics
Centrifugal hydraulics with upstream macerator. The macerator
breaks up admixtures suitable for cutting for transfer in a 1¼"
pressure pipe or larger. The pressure side connection is designed
as a horizontal flange connection.
The hydraulics are not self-priming, in other words, the fluid must
flow in either automatically or with supply pressure.
4.1.2
Motor
The drive versions used are single-phase current and three-phase
current surface-cooled motors. The motor 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 available in the following versions:
ƒ
Single-phase current version with shockproof plug
On AC motors, the start capacitor and operating capacitor is
installed in a capacitor switchgear.
ƒ
Three-phase current version with bare cable end
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
ƒ
Pump housing: EN-GJL-250 (ASTM A48 Class 35/40B)
ƒ
Impeller: EN-GJL-250 (ASTM A48 Class 35/40B)
ƒ
Macerator: 1.4528 (AISI 440B+Co)
ƒ
Motor housing: Stainless steel AISI 1.4301 (304)
ƒ
Shaft: 1.4401 (AISI 316)
ƒ
Seal on the motor side: C/MgSiO
4
ƒ
Seal on the fluid side: SiC/SiC
ƒ
Seal, static: NBR (Nitrile)
4.1.5
Fitted accessories
Plug
In the "P" version, a shockproof plug is attached. The plug is de-
signed for use in commercially available shockproof sockets and is
not
overflow-proof.
4.2
Monitoring devices
Monitoring of motor winding
The thermal motor monitoring protects the motor winding from
overheating. Temperature limiter with bimetallic strip is fitted as
standard.
Thermal motor monitoring is self-switching for single-phase cur-
rent motors, i.e. if the motor is switched off due to overheating
and then cools down, it is automatically switched on again.
For three-phase current motors, the thermal motor monitoring
must be connected in the switchgear or plug.
External monitoring of the sealing chamber
The sealing chamber can be equipped with an external pencil
electrode. The electrode registers fluid ingress through the mech-
anical seal on the fluid side. An alarm or deactivation of the pump
can therefore take place by pump control.
4.3
Operating modes
Operating mode S1: Continuous duty
The pump can operate continuously at the rated load without ex-
ceeding the permissible temperature.
