NORDAC LINK (SK 250E-FDS ... SK 280E-FDS) – Users Manual for Frequency Inverters as Field Distributors
46 BU 0250 en-3021
Pos: 123 /Anleitungen/ Elektronik/F U und Starter/2. Montage und Ins tallation/Elektr ischer Anschluss/ SK 1xxE, SK 2xxE, SK 5xxP, SK xxxE -FDS/Steuerteil/E lektrischer Ansc hluss Steuerteil_01 [SK xxxE-FDS] @ 12\mod_147142727 3332_388.docx @ 341260 @ 3 @ 1
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.
Pos: 124 /Anleitungen/ Elektronik/F U und Starter/2. Montage und I nstallation/Ele ktrischer Ansc hluss/SK 1xxE, SK 2xxE, SK 5xxP, SK xxxE-FDS/Steuer teil/Elektrisc her Anschluss Steuertei l_02 [SK 2xxE-FDS] @ 50\mod_16 00852869860_388.d ocx @ 2672193 @ @ 1
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.
If necessary, 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 Size
0 1
1)
2
1)
Device with integrated power supply unit (“-HVS” device option)
for SK 270E and SK 280E with “-AUX” option, even if the supply is
exclusively via the yellow cable.
350 mA
420 mA
Note: If additional control voltage is present, e.g. “-AUX” or “-AXS” option,
adjacent 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.
540 mA
510 mA
Device without power supply unit (without “-HVS” device option),
external connection of control voltage
for SK 270E and SK 280E 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
540 mA
510 mA
Device without power supply unit (with “-AS-i” or “-ASS” device option
and without “-HVS” device option), SK 270E and SK 280E with “-ASI”
option, the supply is exclusively via the yellow cable.
210 mA
180 mA
1) with fan / without fan on the heat sink
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