Connection Of The Single-Phase Motor; Three-Phase Motor Connection - Wilo Rexa PRO Instrucciones De Instalación Y Funcionamiento

6.5.2.1 Checking the insulation resistance
of the motor winding
6.5.2.2 Test the resistor of the temper-
ature sensor
6.5.2.3 Testing the resistor of the ex-
ternal electrode for sealing cham-
ber control
6.5.3 Connection of the single-phase
motor
PE N L
C
r
M 1~
Fig. 8: Connection diagram single-phase motor
6.5.4

Three-phase motor connection

Installation and operating instructions Wilo-Rexa PRO
Installation and electrical connection
Use an insulation tester to measure the insulation resistance (measuring
voltage = 1000 V). Observe the following values:
▪ At the time of initial commissioning: Insulation resistance may not be less than 20 MΩ.
▪ For further measurements: Value must be greater than 2 MΩ.
Measure the resistor of the temperature sensors with an ohmmeter. The following
measured values must be complied with:
▪ Bimetallic strip: Measured value = 0 Ohm (passage).
▪ PTC sensor (PTC thermistor): Measured value depends on the number of sensors in-
stalled. At PTC sensor has a cold resistance of between 20 and 100 Ohm.
– With three sensors in series, the measured value is between 60 und 300 Ohm.
– With four sensors in series, the measured value is between 80 und 400 Ohm.
Measure the resistor of the electrode with an ohmmeter. The measured value must ap-
proach "infinity". For values ≤ 30 kOhm, if there is water in the oil – change the oil!
The single-phase current version is equipped with bare cable ends. Connection to the
mains is established by connecting the power supply cable in the switchgear. Electrical
connection must always be carried out by a qualified electrician!
NOTICE! The individual wires are designated according to the connection diagram.
Do not cut the wires! There is no additional assignment between the wiring diagram
and connection diagram.
20 21 DK
Wire
1, 2
3
4
5
6
Green/yellow (gn-
ye)
For three-phase current motors, a clockwise rotating field must be available. The three-
phase current version is equipped with a CEE plug or with a bare cable end:
▪ If a CEE plug is supplied, connection to the mains is established by inserting the plug
into a socket. The plug is not overflow-proof. Install the socket so that it is overflow-
proof! Observe the information on the protection class (IP) of the plug.
▪ If there is a bare cable-end, the pump must be connected directly to the switchgear.
DANGER! If the pump is connected directly to the switchgear, arrange for the elec-
trical connection to be carried out by a qualified electrician!
Designa- Terminal
tion
20, 21 Monitoring of motor winding
U1/Z1 L
U2 N
Z2 Connection for start and operating capacitor
DK Monitoring of motor compartment
PE Earth
en
159