NORDAC FLEX (SK 200E ... SK 235E) – Users Manual for Frequency Inverters
62
BU 0200 en-US-4920
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2.4.2.1
Power supply connection (L1, L2(/N), L3, PE)
No special safety measures are required at the line input side of the device. It is advisable to use
standard power fuses (see Technical Data) and a main switch or contactor.
Device data
Permissible power supply data
Model
Voltage
Power
1 ~ 115 V
1 ~ 230 V
3 ~ 230 V
3 ~ 400 V
SK…112-O
115 VAC
0.25 … 0.75 kW
X
SK…123-A
230 VAC
0.25 … 1.1 kW
X
SK…323-A
230 VAC
≥ 0.25 kW
X
SK…340-A
400 VAC
≥ 0.37
kW
X
Connections
L/N = L1/L2
L/N = L1/L2
L1/L2/L3
L1/L2/L3
Disconnection from or connection to the AC power supply must always take place at all poles and be
simultaneous (L1/L2/L3 or L1/N).
In the factory default setting, the device is configured for operation in TN or TT systems (grounded neutral).
The line filter here has its normal effect and the resulting leakage current. Use a supply system
grounded in the neutral point, and a PEN conductor in single-phase devices!
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Adaptation to IT grids
– (from size
1
)
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WARNING
Unexpected movement in case of power system fault
In case of a power system fault (ground fault) a switched-off variable frequency drive may switch on
automatically. Depending on the parameterization, this may cause the drive unit to start automatically
and therefore cause a risk of injury.
• Secure the system against unexpected movement (block, decouple mechanical drive, provide
protection against falling, etc.)
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NOTICE
Operation in IT networks (ungrounded supplies)
If a power system fault (ground fault) occurs in an IT network (ungrounded), the DC link of a connected variable
frequency drive may become charged even if it is switched off. This leads to the destruction of the DC-link
capacitors due to overcharging.
•
Connect a braking resistor to dissipate excess energy.
•
Ensure that the variable frequency drive controller is ready for operation as necessary:
– If a device with an integrated power supply unit (
SK 2x0E
) is used, the internal control unit and therefore
all monitoring functions switch on automatically.
– If a device without an integrated power supply unit (
SK 2x5E
) is used, the 24 V supply of the device must
be switched on before the line voltage is switched on. The 24 V supply to the device must only be
switched off after the device has been disconnected from the line voltage.
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