Wilo EMU FA Notice De Montage Et De Mise En Service page 51

6.5.2 Maintenance tasks
6.5.2.1 Checking the insulation resistance
of the motor winding
6.5.2.2 Testing the resistor of the ex-
ternal electrode for sealing cham-
ber control
6.5.3 Connection of the single-phase
current motor
PE N
C
r
M 1~
Fig. 7: Connection diagram single-phase cur-
rent motor
Installation and operating instructions Wilo-EMU FA + F-Motor
Installation and electrical connection
Circuit breaker
The size of the circuit breakers conforms to the rated current of the pump. The switch-
ing characteristics should comply with group B or C. 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 temperature
compensation, differential triggering and anti-reactivation device in accordance with
the local regulations. In case of sensitive mains, make provision for the installation on-
site of other protective equipment (e.g. overvoltage, undervoltage or phase failure re-
lay, etc.).
Residual-current device (RCD)
Comply with the regulations of the local energy supply company! The use of a residual-
current device is recommended.
If persons come into contact with the device and conductive fluids, secure the connec-
tion with a residual-current device (RCD).
Carry out the following maintenance tasks prior to installation:
▪ Check the insulation resistance of the motor winding.
▪ 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 power supply cable. Contact customer service in the event of a
fault.
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 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!
L
Wire colour
Black (bk)
Blue (bu)
Green/yellow (gn-ye)
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.
Terminal
L
N
Earth
en
51