Monitoring Devices; Operating Modes; Operation With Frequency Converter; Operation In An Explosive Atmosphere - Wilo Rexa UNI Installation And Operating Instructions Manual

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4.1.4 Material
▪ Pump housing: PP-GF30
▪ Impeller: PP-GF30
▪ Motor housing: 1.4301
▪ Shaft: 1.4401
▪ Seal on the fluid side: SiC/SiC
▪ Seal on the motor side: NBR (V05), C/Cr (V06)
▪ Seal, static: NBR
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 at-
tached for single-phase AC motors and a CEE plug is
attached for three-phase motors The plug is designed
for use in commercially available shock-proof or CEE
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 limiting with
bimetallic strip is fitted as standard.
Thermal motor monitoring is self-switching for single-
phase current motors. I.e. if the motor is switched off
due to overheating and then cools down, it is automat-
ically 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
combination of periods of operation and standstill.
Specified value (e.g. S3 25 %) relates to the operating
10
Product description
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
Mains connection [U/f] See rating plate
Power consumption [P ] See rating plate
1
Rated power [P ] See rating plate
2
Maximum delivery head See rating plate
[H]
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
Max. immersion depth See rating plate
[8]
Cable length (standard 10 m
version)
Explosion protection -
Operating modes
Immersed [OTs] S1
Non-immersed [OTe] S2-15, S3 10 %*
Pressure connection
UNI V05... DN 50, PN 10
UNI V06... DN 50/65, PN 10
* Operating mode S3 25 % is permitted if the necessary
motor cooling is guaranteed before the motor is
switched on again! To ensure the required cooling, the
motor must be completely immersed for at least 1 min.!
4.7

Type key

Example: Wilo-Rexa UNI V05/T06-540/P
UNI Series
WILO SE 2017-03