Electrical Connection; Three-Phase Motor - Wilo Drain TMT 32M Notice De Montage Et De Mise En Service

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number of motor activations (switching cycles)
being exceeded.
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.
• 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.
• Ground the pump properly.
Pumps that are permanently installed must be
grounded in compliance with nationally applica-
ble standards. If a separate grounding conductor
is available, 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 grounding conductor
connection must correspond to the local regula-
tions.
• A motor protection switch must be used for
motors with a free cable end. We recommend
using a residual-current device (RCD).
• Switchgears 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.
Only slow-blow fuses or K characteristic auto-
matic cut-outs may be used as a back-up fuse.
5.5.2. Checking the insulation resistance and moni-
toring devices before commissioning
If the values measured deviate from the specifi-
cations, moisture may have penetrated into the
motor or the power supply cable or the monitor-
32
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.
Temperature sensors
Before connecting the monitoring device, this
must be checked with an ohmmeter. The follow-
ing values must be complied with:
• Bimetallic strip: Value = "0" passage

5.5.3. Three-phase motor

Fig. 3.: Connection diagram
L1
L2 Mains connection
L3
PE Earth
The three-phase current version is supplied with
bare cable ends. The connection to the mains is
made at the switchgear.
Electrical connections may only be made by a
qualified electrician!
The wires of the connection cable are assigned as
follows:
7-wire connection cable
Wire number Terminal
1
Temperature monitor for wind-
ing
2
3 U
4 V
5 W
Leakage detection for motor
6
compartment
Green/yellow Earth (PE)
5.5.4. Connecting the monitoring devices
Each monitoring device must always be connect-
ed.
Motor temperature monitor
• Bimetallic strips must be connected in the
switchgear itself or via an evaluation relay.
Connection values: max. 250 V(AC), 2.5 A,
cos φ = 1
• When the threshold is reached, the unit must
deactivate.
For this reason, no warranty claims can be accept-
ed for any damage to the winding resulting from
unsuitable motor monitoring.
INSTALLATION
Leakage detection for
DK
motor compartment
20
Bimetallic strip
21
WILO SE 04/2014 V05 DIN A4