3-14 Installing the Inverter
605C Frequency Inverter
Line Chokes (input)
Line chokes may be used to reduce the harmonic content of the supply current where this a
particular requirement of the application or where greater protection from mains borne transients
is required. Please refer to SSD Drives for the selection of a suitable line choke.
AC Motor Choke (output)
Maximum Motor dv/dt = 10,000V/µs. This can be reduced by adding a motor choke in series
with the motor.
Installations with longer than specified motor cable runs may suffer from nuisance overcurrent
trips, refer to Chapter 11: “Technical Specifications” - Cabling Requirements for maximum
cable lengths. A choke may be fitted in the inverter output to limit capacitive current. Screened
cable has a higher capacitance and may cause problems in shorter runs.
Note: Motor chokes must be fitted for 380-460V and 500V units with screened cable runs in
excess of 50m; limit the switching frequency to 3kHz in these applications. Refer to
Chapter 6: “Programming Your Application” - PATTERN GEN.
Contact SSD Drives for further information.
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