Wilo EMU KS 5 Ex Notice De Montage Et De Mise En Service page 225

6.5.1 Fuse on mains side
6.5.2 Maintenance tasks
6.5.2.1 Checking the insulation resistance
of the motor winding
6.5.2.2 Test the resistor of the temperat-
ure sensor
Installation and operating instructions Wilo-EMU KS
Installation and electrical connection
DANGER
Risk of explosion due to incorrect connection!
• Always connect the pump to an electrical outlet outside the explosive area. If
the connection must be made within the explosive area, then connection must
be carried out in an Ex-rated housing (ignition protection class
DIN EN 60079-0)! Non-observance may lead to fatal injury due to explosion!
• Connect the potential compensator to the earth terminal indicated. The earth
terminal is installed in the area of the power supply cable. A cable cross-section
in accordance with the locally applicable regulations must be used for the po-
tential compensator.
• Connection must always be carried out by a qualified electrician.
• For the electrical connection, also note the additional information in the chapter
on potentially explosive areas found in the appendix of these installation and
operating instructions!
▪ The mains connection must match the specifications on the rating plate.
▪ Power supply on mains side for three-phase current motors with clockwise rotating
field.
▪ Lay the power supply cables in accordance with the locally applicable regulations and
connect them according to the wire assignment.
▪ Connect the monitoring devices and check their function.
▪ Earth the device properly in accordance with applicable local regulations.
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.
▪ KS...Ex only: Test the resistance of the temperature sensor.
▪ Test the resistor 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 or the monitoring device is defective. 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 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.
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