Manual

SK 180E Manual for frequency inverters
28 Pre-series version BU 0180 GB-0914
2.4 Overvoltage filter SK CIF
The use of a suitable ("CSA-") overvoltage filter is mandatory (see also Section 1.5) in order to comply with
cUL requirements. For 230V devices, operation of the frequency inverter with a suitable overvoltage filter is
only permissible if a mains choke is used in addition.
For further information about the overvoltage filter, please refer to the relevant data sheet. These data
sheets can be downloaded at www.nord.com.
Inverter ID
Filter type
Data sheet
SK 1x0E-250-323-A… SK 1x0E-111-323-A*
SK CIF-323-20
(alternatively SK CIF-323-40)
TI 030 276997070
(TI 030 276997071)
SK 1x0E-250-340-A… SK 1x0E-221-340-A
SK CIF-340-30
(alternatively SK CIF-340-60)
TI 030 276997080
(TI 030 276997081)
* (only with suitable mains choke)
Without an overvoltage filter, frequency inverters for 1~ 115V mains (SK1x0E-xxx-112-O) cannot be
approved according to cUL.
CAUTION!
Modules SK CIF-323-x0 may only be used in combination with a suitable mains choke
(L
min
= 3 x 0,73 mH) (see connection diagram).
For SK CIF-340-x0 modules the use of a mains input choke is not mandatory, but is recommended.
Note
With the use of a mains choke, the effective input currents of the 1~ 230V frequency inverter reduce
to approximately the values of the output currents. Several frequency inverters can be connected to
a choke - filter combination. In this case, the total input currents must not exceed the current rating
of the filter.