NORD Drivesystems BU0180 - Manual (Page 32)

SK 180E Manual for frequency inverters
32 Pre-series version BU 0180 GB-0914
Mains
Motor
2.7.1 Mains supply (L1, L2, L3, PE)
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 can optionally be used for single phase or three-phase operation.
400V devices are designed for three phase mains voltage 380...480V (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).
Connection cross-section:
0.2 ... 4/6 mm
2
rigid/ flexible
cable AWG 24-10
For looping of the mains voltage,
up to a cable cross-section of
2 x 2.5mm
2
double wire end
sleeves must be used.
Starting torque:
0.5 ... 0.6Nm
Operation in IT network
The use of this frequency inverter on an IT network is possible after modifications by means of jumpers for
size 2. Further details in Section 2.7.4. The prerequisite is a connected brake resistor, in order to prevent
impermissible charging of the inverter link circuit in case of a mains fault (short-circuit to earth).
2.7.2 Motor cable (U, V, W, PE)
The motor cable may have a total length of up to 50m if this is a standard cable. If a screened motor cable
is used, or if the cable is laid in a well earthed metal conduit, the total length should not exceed 20m.
In order to comply with interference suppression class C2, a total length of 5m must not be exceeded.
Connection cross-section:
0.2 ... 4/6 mm
2
rigid/ flexible
cable AWG 24-10
Starting torque:
0.5 ... 0.6 Nm
Note: Please note also Section 9.3.3
(EMC).
Note: For multiple motors operation
the total motor cable length consists of the sum of the individual cable lengths.
Note: The motor cable must not be switched as long as the inverter is providing power to the motor.
(The inverter must be on "Standby" or "Starting Disabled")