NORD Drivesystems BU0540 - Manual (Page 20)

SK 500E – Brief instructions for frequency inverters
20 BU 0540 GB-1013
For multiple motor operation the total motor cable length consists of the sum of the individual cable
lengths.
NOTICE Output switching
The motor cable must not be switched as long as the inverter is pulsing (The inverter must be in "Standby" or
"Starting disabled" status).
Otherwise the inverter nay be damaged.
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Breake resistor (X2 - +B, -B)
The terminals +B/ -B are intended for the connection of a suitable braking resistor. A short screened
connection should be selected. For the installation of a braking resistor, the large amount of heat
which is generated due to its operation (> 70°C) must be taken into account.
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2.2.4 Electrical connections, control unit
The control connections are located under the front cover (above size 8 under the two front covers) of
the frequency inverter. The configuration differs according to the size. Up to size 7, the individual
control terminals (X3, X8, X13) are in staggered positions (please also refer to Section 2.2).
Connection data:
Frequency inverter All Size 1 … 4 Size 5 … 7 Above
size 8:
Terminal block Typically X3 X3, X8,
X12, X13
X3.1/2,
X15
Rigid cable Ø [mm²] 0.14 … 1.5 0.14 … 2.5 0.2 … 6 0.2 … 2.5
Flexible cable Ø [mm²] 0.14 … 1.5 0.14 … 1.5 0.2 … 4 0.2 … 2.5
AWG standard 26-16 26-14 24-10 24-12
Starting torque [Nm] Clamping 0.5 … 0.6 0.5 … 0.6 Clamping
[lb-in] 4.42 … 5.31 4.42 … 5.31
GND/0V is a common reference potential for analog and digital inputs.
Furthermore, it must be taken into account that with SK 5x5E size 1 ... 4 frequency inverters, terminal
44 is used to feed in the control voltage. However with devices of size 5 and above, this terminal
provides a 24V control voltage.
NOTICE Cable laying
All control cables (including the thermistor) must be laid separately from the mains and the motor cables, in order
to prevent interference to the inverter.
If the cable are laid in parallel, a minimum distance of 20cm must be maintained from cables which carry a
voltage >60V The minimum distance may be reduced by screening the cables which carry a voltage, or by the
use of earthed metal partitions within the cable conduits.