Lenze 8200 Frequency inverters - Manual (Page 167)

Configuration
8200SHB0199 7-30
Function C144 - C144 = -0-
- With chopper frequencies of 12 kHz or 16 kHz and if the max. permissible heat sink
temperature is exceeded ( J
max
) because of higher losses, the inverter will be inhibited, TRIP
will be indicated and the motors idles.
- C144 = -1- (automatic chopper frequency derating):
- With chopper frequencies of 12 kHz or 16 kHz, the inverter reduces the chopper frequency
automatically to 8 kHz and thus ensures operation, if a heat-sink temperature of J
max
-10 •C is
exceeded.
- After the heat sink has cooled down, the chopper frequency is automatically increased again.
Important - The automatic chopper frequency reduction leads to a higher noise generation compared to the
operation with 12 kHz or 16 kHz.
- The current limitation C022/C023 is not automatically influenced by the selected chopper
frequency.
- For 822X/824X only if C144 = -1-
- With chopper frequencies of 8 kHz, 12 kHz or 16 kHz, the controller reduces the chopper
frequency automatically to 4 kHz, if the maximum current is exceeded.
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