TB Wood's WFC1000 Series, Installation, Operation And Maintenance Instructions

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Parameter Units Level
83-PWM - PWM Carrier Frequency Selector L2
This parameter sets the carrier frequency of the Pulse-Width-Modulation waveform supplied to the motor.
Low carrier frequencies provide better low end torque but produce audible noise from the motor. Higher
carrier frequencies produce less audible noise, but cause more heating in the inverter. The WFC
HT is rated to
produce continuous full load current at rated ambient temperatures when parameter 83-PWM is set to carrier
frequencies 3, 4, 6 or 8 kHz. At higher carrier frequencies (12 and 16 kHz), the inverter will auto-
matically switch to a lower carrier frequency when load conditions exceed the derating levels. When
the load is reduced, the carrier frequency will return to its previous setting. Data Code 0 (Autoselect)
automatically selects the highest carrier frequency permitted without overheating the inverter. Note:
Autoselect will also adjust the carrier frequency to 8 kHz at 75° C and to 4 kHz at 90° C. When using Data
Codes 5 & 6, the carrier frequency will shift to 1/2 of the selected carrier frequency when the output voltage
is less than 6% of nominal rating. When using Data Codes 7 and 8, the carrier frequency will shift to 1/2 of
the selected carrier frequency when the output voltage is less than 12% of nominal rating and to 1/4 of the
selected carrier at 6% of nominal output voltage. For low speed high torque applications, the best
performance can be achieved by selecting Data Codes 1, 2, 7 or 8. Adjustments are as follows:
DATA MAXIMUM MOTOR CARRIER CARRIER FREQUENCY CARRIER FREQUENCY
CODE FREQUENCY (Hz) FREQUENCY (kHz) (kHz) @ 12% Vout (kHz) @ 6% Vout
0 400 Autoselect Autoselect Autoselect
1* 260 3 3 3
2 350 4 4 4
3 400 6 6 6
4 400 8 8 8
5 400 12 12 6
6 400 16 16 8
7 400 12 6 3
8 400 16 8 4
*Factory Setting
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