Wilo Rexa CUT GI-Serie Einbau- Und Betriebsanleitung Seite 103

6.5.1 Fuse on mains side
Circuit breaker
The size and switching characteristics of the circuit
breakers must conform to the rated current of the con-
nected product. Observe local regulations.
Motor protection switch
Make provision for an on-site motor protection switch
for devices without a plug! The minimum requirement is
a thermal relay/motor protection switch with temper-
ature compensation, differential triggering and anti-re-
activation device in accordance with the local regula-
tions. In case of sensitive mains, make provision for the
installation on-site of other protective equipment (e.g.
overvoltage, undervoltage or phase failure relay, etc.).
Residual-current device (RCD)
Comply with the regulations of the local energy supply
company! The use of a residual-current device is recom-
mended.
If persons come into contact with the device and con-
ductive fluids, secure the connection with a residual-
current device (RCD).
6.5.2 Maintenance tasks
Carry out the following maintenance tasks prior to in-
stallation:
▪ Check the insulation resistance of the motor winding.
▪ Test the resistance of the temperature sensor.
▪ Test the resistance of the pencil electrode (optionally
available).
If the measured values differ from the specifications:
▪ Moisture may have penetrated into the motor or the
connection cable.
▪ The monitoring device may be defective.
Contact customer service in the event of a fault.
6.5.2.1 Checking the insulation resistance of the motor wind-
ing
Use an insulation tester to measure the insulation resist-
ance (measuring voltage = 1000 V). Observe the follow-
ing 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.
NOTICE! For motors with an integrated capacitor,
short-circuit the windings prior to checking!
Installation and operating instructions Wilo-Rexa CUT GI
Installation and electrical connection
6.5.2.2 Test the resistor of the temperature sensor
Measure the resistor of the temperature sensors with an
ohmmeter. The bimetallic strips must have a measured
value of 0 Ohm (passage).
6.5.2.3 Testing the resistor of the external electrode for seal-
ing chamber control
Measure the resistor of the electrode with an ohmmeter.
The measured value must approach "infinity". For values
≤ 30 kOhm, if there is water in the oil – change the oil!
6.5.3 Connection of the single-phase current motor
PE
Fig. 7: Connection diagram single-phase current motor
Wire colour Terminal
Brown (bn) L
Blue (bu) N
Green/yellow (gn-ye) Earth
The single-phase current version is equipped with a
shockproof plug. The connection to the mains is estab-
lished by inserting the plug into a socket. The plug is not
overflow-proof. Install the socket so that it is over-
flow-proof! Observe the information on the protection
class (IP) of the plug.
DANGER! If the pump is connected directly to the
switchgear, dismantle the plug and arrange for the
electrical connection to be carried out by a qualified
electrician!
N L
C r
M 1~
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