4.4 Electrical connection
DANGER
Electric shock
Death or serious personal injury
‐
Before starting any work on the prod-
uct, make sure that the power supply is
switched off and that it cannot be
switched on unintentionally.
Connect the pump to an external main switch
ensuring all-pole disconnection with a contact
separation according to EN 60204-1. It must be
possible to lock the main switch in position 0. Type
and requirements as specified in EN 60204-1.
The supply voltage and frequency are marked on the
nameplate. Make sure that the motor is suitable for
the power supply available at the installation site.
Carry out the electrical connection to com-
ply with local regulations.
The pump must be connected to a motor-protective
circuit breaker.
Connect the pump to a control box with a
motor protection relay with an IEC trip
class 10 or 15.
Connect pumps installed in hazardous lo-
cations to a control box with a motor pro-
tection relay with an IEC trip class 10.
The motor is effectively earthed through the earth
conductor of the power cables and the pipes. The
motor top cover for Ex pumps is equipped with
connections for external earthing or an equipotential
bonding conductor.
DANGER
Short-circuit
Death or serious personal injury
‐
For Ex models in dry-installation, ver-
sion D and H, connect an external
earthing.
4.4.1 Wiring diagrams
Standard power cables
V1
U1
W1
V2
U2
W2
V1
U1
W1
V2
U2
W2
V1
U1
W1
V2
U2
W2
1
2
3
4
5
6
V1
U1
W1
V2
U2
W2
TM055943
Wiring diagram for standard power cables
Sensors
1
2
3
4
5
6
7
8
9
1
1
T1
+t°
+t°
+t°
T2
A
1
2
2
2
3
3
3
4
4
4
5
5
5
6
6
6
7
7
7
8
8
8
9
9
9
+t°
+t°
+t°
a
b
c
d
e
f
g
TM055947
Wiring diagram for sensors
Pos.
Description
A
Terminal board connection
a
Thermistors
b
Thermal switches
c
Moisture switches
22
English (GB)
Summary of Contents for ST-55-520
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