Nord Drivesystems NORDAC FLEX SK 205E Series, Brief Instructions

Page: 35 / 100

2 Mounting and installation
BU 0240 en-US-4920 35
Pos: 160 /Anleitungen/El ektr onik/FU und Starter/2. M ontage und Installation/Elektrischer Anschl uss/SK 1xxE, SK 2xxE, SK 5xxP, SK xxxE-FDS/Steuerteil/El ektrischer Anschluss Steuerteil [SK 2xxE] @ 20\mod_1513343185610_14638.docx @ 2375937 @ 3 @ 1
2.3.3 Electrical connection of the control unit
Connection data:
Terminal block Size 1-4 Size 4
typically Terminals 79/80
Cable Ø * [mm²] 0.2 … 2.5 0.2 … 4
AWG standard 24-14 24-12
Tightening torque [Nm] 0.5 … 0.6 0.5 … 0.6
[lb-in] 4.42 … 5.31 4.42 … 5.31
Slotted screwdriver [mm] 3.5 3.5
* flexible cable with ferrules (with or without plastic collar) or rigid cable
SK 2x0E SK 2x5E
The device generates its own 24 V DC control
voltage and provides this to terminal 43 (for
connecting external sensor systems, for
example).
However, size 4 devices can also be supplied
by an external control voltage source
(connection to terminal 44). The switchover
between the internal and external power
supply unit takes place automatically.
The device must be provided with an external
24 V DC control voltage. Alternatively, an
optional 24 V DC power supply unit model
SK CU4-… or SK TU4-… can be used.
The control voltage for devices that use the
AS interface (SK 225E and SK 235E) must
be supplied via the yellow AS interface line.
However, in this case the variable frequency
drive must not have an additional supply via
terminal 44 in order to prevent damage to the
power supply unit or the AS interface bus.
Information
Control voltage overload
A control unit overload caused by impermissibly high currents may destroy the unit. Impermissibly high currents
occur if the total current actually obtained exceeds the permissible total current, or if the 24 V DC control voltage
for other devices is passed through the variable frequency drive. Use double ferrules, for example, to avoid
conduction through the variable frequency drive.
The control unit can also be overloaded and destroyed if the 24 V DC supply terminals of devices with an
integrated power supply unit (SK 2x0E) are connected to a different voltage source. For this reason, make sure
that any wires for the 24 V DC power supply are not connected to the device but are insulated accordingly,
particularly when installing connectors for the control connection (example of connector for system bus
connection SK TIE4-M12-SYSS).
Information
Total currents
24 V DC can be taken from several terminals as necessary. This also includes e.g. digital outputs or an operating
module connected via RJ45.
The sum total of currents obtained must not exceed the following limits:
Device model Size 1 to 3 Size 4
SK 2x0E 200 mA 500 mA
SK 2x5E 200 mA -
Devices with AS interface, when using the AS interface 60 mA 60 mA