Monitoring Devices; Operating Modes; Operation With Frequency Converter; Operation In An Explosive Atmosphere - Wilo Rexa UNI Einbau- Und Betriebsanleitung

en
▪ Single-phase current version:
– With shockproof plug
– With shockproof plug and fitted with a float switch
▪ Three-phase current version:
– With bare cable end
– With CEE plug and fitted with a float switch
4.1.3 Seal
Different designs are used for the seal to the fluid and
the motor compartment:
▪ Rexa UNI V05: A rotary shaft seal is used on the motor
side, a mechanical seal is used on the fluid side.
▪ Rexa UNI V06: A mechanical seal is used on the motor
side and the fluid side.
The sealing chamber between both seals is filled with
medical white oil.
4.1.4 Material
▪ Pump housing: PP-GF30
▪ Impeller: PP-GF30
▪ Motor housing: 1.4301 (AISI 304)
▪ Shaft: 1.4401 (AISI 316)
▪ Seal on the fluid side: SiC/SiC
▪ Seal on the motor side: NBR (nitrile) (V05), C/Cr (V06)
▪ Static seal: NBR (nitrile)
NOTICE! In material version "B", all parts that come in
contact with the fluid are made of stainless steel
1.4401 (AISI 316).
4.1.5 Fitted accessories
Float switch
In the "A" version the pump is equipped with a float
switch. Depending on the fill level, it is possible to switch
the pump on and off automatically, by using the float
switch.
Plug
In the "P" and "A" version, a shockproof plug is attached
for single-phase AC motors and a CEE plug is attached
for three-phase current motors. The plug is designed for
use in commercially available shock-proof or CEE sock-
ets and is not overflow-proof.
4.2

Monitoring devices

Monitoring of motor winding
The thermal motor monitoring protects the motor wind-
ing from overheating. Temperature limiter with bimetal-
lic strip is fitted as standard.
Thermal motor monitoring is self-switching for single-
phase current motors, i.e. if the motor is switched off
38
Product description
due to overheating and then cools down, it is automati-
cally switched on again.
For three-phase current motors, the thermal motor
monitoring must be connected in the switchgear or plug.
4.3

Operating modes

Operating mode S1: Continuous duty
The pump can operate continuously at the rated load
without exceeding the permissible 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 tem-
perature 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 com-
bination of periods of operation and standstill. Specified
value (e.g. S3 25 %) relates to the operating time. The
switching 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 converter

Operation on the frequency converter is not permitted.
4.5

Operation in an explosive atmosphere

Operation in an explosive atmosphere is not permitted.
4.6

Technical data

General
Date of manufacture See rating plate
[MFY]
Mains connection [U/f] See rating plate
Power consumption [P ] See rating plate
1
Rated power [P ] See rating plate
2
Max. delivery head [H] See rating plate
Max. volume flow [Q] See rating plate
Activation type [AT] See rating plate
Fluid temperature [t] 3...40 °C
Protection class IP68
Insulation class [Cl.] F
Speed [n] See rating plate
Max. switching fre- 30/h
quency
WILO SE 2019-02