NORDAC LINK (SK 155E-FDS / SK 175E-FDS) – Users Manual for Motor Starters as Field Distributors
42 BU 0155 en-3520
2.3.3 Electrical connection of the control unit
Connection of the control cables is made exclusively via M12 plug connectors. The plug connectors
are permanently installed at the factory. These enable the use of straight connectors, and at option
slots M1 to M8 angled (encapsulated) cable plug connectors. The use of cable plug connectors
assembled by the customer must be checked in individual cases.
24 V DC control voltage
The FI requires a 24 V DC control voltage for operation. Depending on the device, this control voltage
can be provided in various ways:
• Integrated switched mains unit (equipment code –HVS),
• External connection via M12 plug connector (option slot M8),
• External connection via M12 plug connector (option slots Z1 - Z4),
• External connection via power plug connector (option slot X1).
Frequency inverters with the option –HVS typically do not require an external 24 V DC connection. If
however such a device also has an optional 24 V DC connection facility, this can be used without
danger. In this case the external 24 V DC supply supports the integrated switched mains unit. In
particular this covers the requirements of powerful actuators which are controlled by the FI.
Devices which are not equipped with the –HVS option must be supplied via an external 24 V DC
voltage source.
Control voltage overload
An overload of the control unit by impermissibly high currents may destroy it. Impermissibly high currents occur if
the actual drawn total current exceeds the permissible total current.
24 V can be drawn from multiple terminals. This also includes e.g. digital outputs or a control module connected
via RJ12.
The drawn total currents must not exceed the following limit values:
Device type SK 155E SK 175E
Device with integrated power supply unit (“-HVS” device option) for SK 1x5E-FDS-…-
ASI with “-AUX” option, even if the supply is exclusively via the yellow cable.
Note: If additional control voltage is present, e.g. “-AUX” or “-AXS” option, the 530 mA
and 490 mA currents may be drawn. It must, however, be ensured that the integrated
power supply unit is not overloaded when there is no more external voltage.
Device without power supply unit (without “-HVS” device option), external connection of
control voltage for SK 1x5E-FDS-…-ASI with “-AUX” option, even if the supply is via
the black and yellow cables.
Note: For AS-i, applicable for “-AUX” or “-AXS” device option
Device without power supply unit (“-AS-i” or “-ASS” device option and without "-HVS"
device option) for SK 1x5E-FDS-…-ASI with “-ASI” option. The supply is exclusively
effected via the yellow cable.
Response time of digital inputs
The response time to a digital signal is approx. 4 … 5 ms and consists of the following:
Scan time 1 ms
Signal stability check 3 ms
Internal processing <
1 ms
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