Electrical Connection - Wilo Drain MTC 32F Serie Einbau- Und Betriebsanleitung

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• Separate reactivation point
A second switching point (additional float 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.

5.6. Electrical connection

ELECTROCUTION hazard!
Incorrect electrical connections can cause fa-
tal electric shocks. Electrical connections may
only be carried out by a qualified electrician
who is approved by the local power supplier,
in accordance with locally applicable regula-
tions.
• The mains current and voltage must be as stated
on the name plate.
• Connect the power supply cable in accordance
with the applicable standards and regulations and
according to the wire assignment.
• Any available monitoring equipment, e.g. for the
motor temperature, must be connected and test-
ed to ensure that it is working properly.
• For three-phase current motors, a clockwise
rotating field must be available.
• Ground the product properly.
Products 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 grounding terminal (;) using a suitable
screw, nut, toothed washer and flat washer. The
cross section of the cable for the grounding con-
ductor connection must correspond to the local
regulations.
• A motor protection switch must be used for
motors with a free cable end. We recommend
using a residual current device (RCD)
• Switching devices must be purchased as acces-
sories.
5.6.1. Mains fuses
The pre-fusing must be rated according to the
starting currents. You will find the starting cur-
rents on the name plate.
Only slow-blow fuses or K characteristic auto-
matic cut-outs may be used for pre-fusing.
5.6.2. Three-phase current motor
Fig. 4.: Wiring diagram for delta connection
6-core cable (MTC 32F39...)
Wire no. Terminal
1 U
2 V
3 W
4
Temperature monitor for winding
5
40
PE (gn-ye) Ground (PE)
7-core cable (MTC 32F17...F33)
Wire no. Terminal
3 U
4 V
5 W
1
Temperature monitor for winding
2
6 Seal integrity monitor for motor chamber
PE (gn-ye) Ground (PE)
Fig. 5.: Wiring diagram for star-delta connection
10-core cable (MTC 32F49...F55)
Wire no. Terminal
1 U1
2 U2
3 V1
4 V2
5 W1
6 W2
7 Temperature monitor for winding
8 None
9 Temperature monitor for winding
PE (gn-ye) Ground (PE)
The three-phase current version is supplied with
free cable ends. The connection to the mains is
made at the switch box terminals.
Electrical connections may only be made by a
qualified electrician!
5.6.3. Monitoring device connections
Each monitoring device must always be connect-
ed.
Motor temperature monitor
• Bi-metal sensors must be connected via an eval-
uation relay. We recommend the CS-MSS relay for
this. The threshold is already preset. When used
outside explosion hazard zones, the sensors
can be connected directly in the control cabinet.
Connection values:
• MTC 32F17...F33:
max. 250 V(AC), 2.5 A, cos φ = 1
• MTC 32F39...F55:
max. 250 V(AC), 1.2 A, cos φ = 0.6
• When the threshold is reached, the unit must
switch off.
When used in explosive atmospheres: The tem-
perature monitor must switch off the system
and lock it against being switched on again!
Switching on again should only be possible if
the release button has been manually activated!
INSTALLATION
WILO SE 2016-07 V4.0 DIN A4