nord NORDAC START Series, User Manual

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NORDAC START (SK 135E / SK 175E) – Users Manual for Motor Starters
40 BU 0135 en-4118
2.3.2 Electrical connection of power unit
NOTICE
EMC Interference to the environment
This device produces high frequency interference, which may make additional suppression measures necessary
in domestic environments (

Section 8.1 "Electromagnetic compatibility (EMC)").
The use of shielded motor cables is essential in order to maintain the specified radio interference suppression
level.
When the device is being connected, please note the following:
1. Ensure that the mains supply provides the correct voltage and is suitable for the current required
(

Section 7 "Technical data").
2. Ensure that suitable electrical fuses with the specified nominal current range are installed between
the voltage source and the device.
3. Mains cable connection: to terminals L1 - L2/N - L3 and PE (depending on device)
4. Motor connection: to terminals U - V - W
A 4-core motor cable must be used if the device is being wall-mounted As well as U - V - W , PE must
also be connected. If present, in this case the cable shielding must be connected to a large area of
the metallic screw connector of the cable gland.
The use of wire end rings is recommended for connecting to PE.
Information
Connection cables
Only use copper cables with temperature class 80°C or equivalent for connection. Higher temperature classes are
permissible.
When using
wiring sleeves , the maximum connection cross-section can be reduced.
Device Cable Ø [mm²] AWG Tightening torque
Size rigid flexible [Nm] [lb-in]
1 … 2 0.5 … 10 0.5 … 10 20-6 1.2 … 1.5 10.62 … 13.27
Table 6: Connection data
2.3.2.1 Mains supply (L1, L2, L3, PE)
No special fuses are required at the mains input side, nor is the use of a motor protection switch
required. It is advisable to use normal mains fuses (see technical data) and a main switch.
Device data Permissible mains data
Type Voltage Power 3 ~ 230 V 3 ~ 400 V
SK…340-B 400 VAC ≥ 0.25 kW X X
Connections L1/L2/L3 L1/L2/L3
Isolation from or connection to the mains must always be carried out for all the poles and
synchronously (L1/L2/L3).
It is advisable to use a fuse module of type SK CU4-FUSE (

Section 3.2 "Optional modules").
Permissible network types
Size 1
devices can in principle be operated in TN/TT networks, as well as in IT networks. With
operation in an IT network, compliance with the EMC limit value class B cannot be ensured under the