NORD Drivesystems BU0200 - Manual (Page 42)

2 Assembly and installation
BU 0200 GB-4411 Subject to technical alterations 41
2.7.1 Mains connections (L1, L2, L3, EARTH)
No special safety measures are required on the mains input side of the frequency inverter. It is advisable to
use normal mains fuses (see technical data) and a main switch or circuit breaker.
115V devices may only be used with a 110…120V (L/N = L1/L2) single phase supply.
230V devices may be ordered either for single phase (...-123-, L/N = L1/L2) or three phase (...-323-, L1/L2/L3)
operation. It is essential to note the type designation!
400V devices are designed for three phase mains voltage 380...500V (L1/L2/L3).
For the exact specification, please refer to the technical data in Section 8.
Isolation from or connection to the mains must always be carried out for all the poles and synchronously
(L1/L2/L2 or. L1/N).
Up to and including Size 3 the connection to PE is made via screw terminals in the cast housing of the con-
nection unit, the Size 4 has a terminal on the power terminal block:
Connection cross-section:
Size 1 … 3:
0.5 ... 6mm
2
rigid/ flexible cable
AWG 20-10
For looping of the mains voltage, up to a
cable cross-section of 2x 2.5mm
2
double
wire end sleeves must be used.
Size 4:
0.5 ... 16mm
2
rigid/ flexible cable
AWG 20-6
Tightening torque:
1.2 ... 1.5Nm
Operation on an IT network
The use of this frequency inverter on an IT network is possible after modifications by means of jumpers.
Further details in Section 2.7.5.
The operation of a frequency inverter in an IT network is only permissible if a brake resistor is connected, in
order to prevent impermissible charging of the inverter link circuit in case of a mains fault (short-circuit to
earth). The prerequisite for the control of the brake resistor is the presence of a 24V control voltage.
Therefore it is essential that an external (24VDC) control voltage supply to the SK 2x5E- is always switched
on before the mains voltage and is switched off after disconnection from the mains.
ATTENTION
For operation of the SK 2x5E- frequency inverter on an IT network, the mains voltage must
only be connected to the frequency inverter if the control voltage (24V supply) is present.
Otherwise there is a danger of destruction of the frequency inverter in case of a mains fault
(short-circuit to earth).
PE
Main
s