NORD Drivesystems BU0505 - Manual (Page 46)

SK 54xE – Users Manual for Frequency Inverters
46 BU 0505 GB-1013
Mains connections (X1 – PE, L1, L2/N, L3)
No special safety measures are required on the mains input side of the frequency inverter. It is
advisable to use the normal mains fuses (see technical data) and a main switch or circuit breaker.
Frequency inverter data Permissible mains data
Voltage Power 1 ~ 115 V 1 ~ 230 V 3 ~ 230 V 3 ~ 400 V
115 VAC 0.25 … 0.75 kW X
230 VAC 0.25 … 2.2 kW X X
230 VAC
≥ 3.0 kW
X
400 VAC
≥ 0.37 kW
X
Connections L/N = L1/L2 L/N = L1/L2 L1/L2/L3 L1/L2/L3
Isolation from or connection to the mains must always be carried out for all the poles and
synchronously (L1/L2/L2 or. L1/N).
NOTICE Operation in IT networks
The use of this frequency inverter on an IT network is possible after modification of the integrated mains filter.
It is urgently recommended that the frequency inverter is only operated on a IT network if a braking resistor is
connected. If an earthing fault occurs in the IT network, this measure prevents an impermissible charging of the
link circuit capacitor and the associated destruction of the frequency inverter.
For operation with an insulation monitor, the insulation resistance of the frequency inverter must be taken into
account.
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Motor cable (X2 - U, V, W, PE)
The motor cable may have a total length of 100m if this is a standard cable (take EMC into
consideration). If a screened motor cable is used, or if the cable is laid in a metal conduit which is well
earthed, the total length should not exceed 30m.
For greater lengths of cable, an additional output choke (accessory) must be used.
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.
Pos : 54 /Anl eitungen/ Elektroni k/FU und Start er/ 2. M ont age und Ins tall ati on/ 2. 10. 4 Elektrischer Ansc hluss Leis tungst eil -Teil 3 - Brems wi derstand (X2) [ BU 0500] @ 1\ mod_1331195973501_388. doc x @ 17662 @ 5 @ 1
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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