6-5
6
îš„Carrier Frequency and Inverter Overload Capability
The inverter overload capability depends among other things on the carrier frequency setting. If the carrier fre-
quency setting is higher than the factory setting, the overload current capability must be reduced.
Heavy Duty (C6-01=0)
The default carrier frequency for the Heavy Duty mode is 2 kHz. The overload capability is 150% of the
Heavy Duty rated current for 1 minute.
If the carrier frequency is increased, a derating for the continuous output current like shown on Fig 6.2 must
be considered. The overload capability (OL2 Level) does not change. It will be 150% of the derated current
for 1 min.
For the Inverter capacities 220 and 300 kW (400 V class Inverter) and 110 kW (200 V class Inverter) Heavy
Duty Mode can not be selected (i.e. only 120% overload is possible for 1 minute). In order to reach 150%
overload for 1 minute with these inverters the motor rated current must not exceed 80% of the Inverter rated
current.
Fig 6.2 Current Derating in Heavy Duty Mode
50
60
70
80
90
100
110
2 4 6 8 101214
Carrier Frequency (kHz)
Output Current (%)
200V/400V 22kW and less
200V 30kW / 400V 30 to 55kW
200V 37 to 90kW / 400V 75 to 160kW
400V 185kW
To Next Page
Loading...
Need help?
General