Electrical Connection - Wilo Emu Fa+T Einbau- Und Betriebsanleitung

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5.4.1. Remedies for avoiding excessive switching
cycles
• Manual reset
The motor is switched off when the water level
falls below the minimum coverage level and
switched back on when a sufficient water level is
reached.
• Separate reactivation point
A second switching point (additional floater or
electrode) is used to obtain a sufficient difference
between the activation and deactivation points.
This prevents constant switching. This function
can be put into effect with a level control relay.

5.5. Electrical connection

ELECTROCUTION hazard!
Incorrect electrical connections can cause fa-
tal electric shocks. Electrical connections may
only be carried out by a qualified electrician
approved by the local energy supply company,
in accordance with locally applicable regula-
tions.
DANGER due to explosive atmosphere!
With Ex-rated pumps, the power supply cable
must be connected outside the potentially
explosive area, or inside a housing with igni-
tion protection conforming to DIN EN 60079-
0! Non-observance may lead to fatal injury
due to explosion!
• Always have the connection carried out by a
qualified electrician.
• Note the additional information about this in
the appendix.
• The mains connection current and voltage must
be as stated on the rating plate.
• Connect the power supply cable in accordance
with the applicable standards and regulations and
according to the conductor assignment.
• Any available monitoring equipment, e.g. for
thermal motor monitoring, must be connected
and tested to ensure that it is working properly.
• For three-phase AC motors, a clockwise rotating
field must be available.
• Earth the pump properly.
Pumps that are permanently installed must be
grounded in compliance with nationally applicable
standards. If a separate earth conductor is avail-
able, it must be connected to the marked hole
or earth terminal (;) using a suitable screw, nut,
toothed washer and flat washer. The cross section
of the cable for the earth conductor connection
must comply with local regulations.
• A motor protection switch must be used for
motors with a free cable end. We recommend
using a residual-current device (RCD).
• Switchgear must be purchased as accessories.
5.5.1. Mains fuses
The back-up fuse must be rated according to the
starting current. You will find the starting current
on the rating plate.
58
Only slow-blow fuses or K characteristic auto-
matic cut-outs may be used as a back-up fuse.
5.5.2. Check the motor winding and the monitoring
devices before initial commissioning or after
lengthy storage
If the values measured deviate from the specifi-
cations, moisture may have penetrated into the
motor or the power supply cable or the monitor-
ing unit may be defective. Do not connect the
pump and consult Wilo customer service.
Insulation resistance of the motor winding
Before connecting the power supply cable, the
insulation resistance must be tested. This can be
measured with an insulation tester (measuring
voltage = 1000 V):
• On initial commissioning: insulation resistance
may not be less than 20 MΩ.
• For further measurements: value must be larger
than 2 MΩ.
Temperature sensor and pencil electrode (avail-
able as an option) for sealing chamber control
Before connecting the monitoring devices, these
must be checked with an ohmmeter. The follow-
ing values must be complied with:
• Bimetallic strip: Value = '0' passage
• PTC thermistor sensor: A PTC thermistor sensor
has a cold resistance of between 20 and 100 Ω.
If there are 3 sensors in series, this results in a
value of 60 to 300 Ω.
If there are 4 sensors in series, this results in a
value of 80 to 400 Ω.
• Pt100 sensor: Pt100 sensors have a value of
100 Ω at 0 °C. Between 0 °C and 100 °C, this
value increases by 0.385 Ω every 1 °C. At an
ambient temperature of 20 °C, they reach a
value of 107.7 Ω.
• Pencil electrode: This value must approach
infinity. If the value is low, there is water in
the oil. Also observe the instructions of the
optional evaluation relay.
5.5.3. Three-phase AC motor
The three-phase current version is supplied with
bare cable ends. The connection to the mains is
made at the switchgear.
The following list of various connection diagrams
only covers the cable assignments available as
standard. For order-specific versions, a separate
connection diagram is provided for each order.
Please note that the individual wires are desig-
nated according to the connection. Do not cut
them off! Otherwise, it will no longer be pos-
sible to allocate the wires to the connections!
Electrical connections may only be made by a
qualified electrician!
INSTALLATION
WILO SE 07-2015 V05 DIN A4