NORDAC LINK (SK 155E-FDS / SK 175E-FDS) – Users Manual for Motor Starters as Field Distributors
40 BU 0155 en-3520
2.3.2 Electrical connection of power unit
EMC interference to the environment
This device produces high-frequency interference, which may make additional suppression measures
necessary in domestic environments (see 8.1 "Electromagnetic compatibility (EMC)").
Please note the following on connecting the device:
1. Ensure that the mains supply provides the correct voltage and is suitable for the current required
(see 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 (supply – “LE”): on option slot X1
4. Motor cable connection (“MA”): on option slot X3
5. Optional
a. Mains cable connection (outlet – “LA”): on option slot X2, or
b. Motor cable connection (2. motor – “MA2”): on option slot X2
At least one four-core motor cable must be used and U-V-W and PE connected to the plug connector.
Connection cables
Only use copper cables with temperature class 80°C or equivalent for connection.
Higher temperature classes are permissible.
2.3.2.1 Mains connection
No special fuses are required on the mains input side of the device. It is advisable to use mains fuses
(see technical data) and a main switch or contactor.
Isolation from or connection to the mains must always be carried out synchronously and for all poles.
In the standard version, the device is configured for operation in TN or TT networks. The mains filter
provides its normal effect and the resulting leakage current. A star point-earthed mains must be used.
In case of "Daisy Chain" wiring (looping of the mains voltage from one FI to the next) use of a fuse
module type SK CU4-FUSE is recommended ( Section 1.3 "Scope of delivery"). This enables
protection of the individual device. This avoids a total failure of the entire line in case of a device fault.
Adaptation to IT networks – (from size 1)
For operation in an IT network, the FI must be configured with modification of the integrated mains
filter. Modification of the mains filter is performed at the factory and must be taken into account in the
order. Configuration for IT networks reduces the EMC.
The insulation resistance of the frequency inverter must be taken into consideration when operating on
an insulation monitor ( Section 7.1 "General motor starter data").
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