Emotron VSB Instruction Manual Chapter 6 Specification of Parameters
Group E Enhancement Function and Protection Parameters
Group E0 Enhancement Function
With lower carrier frequency, output current of the drive produces higher harmonics, motor loss
increases, and temperature and motor noise rise, but drive temperature, drive leakage current,
and drive interference to external devices are lower or less.
with higher carrier frequency, drive temperature will rise, drive leakage current is bigger,
and drive interference to external devices is bigger. However, motor loss and noise will be lower,
and motor temperature will drop.
The table below specifies the setting range and factory default of PWM carrier frequency of
the drives at different power ratings:
Table 6-5
Power rating of the drive
PWM carrier frequency setting method:
1) When the motor line is too long, reduce carrier frequency.
2) When torque at low speed is unstable, reduce carrier frequency.
3) If the drive produces severe interference to surrounding equipment, reduce carrier
frequency.
4) Leakage current of the drive is big, reduce carrier frequency.
5) Drive temperature rise is relatively high, reduce carrier frequency.
6) Motor temperature rise is relatively high, increase carrier frequency.
7) Motor noise is relatively big, increase carrier frequency.
E0-01 PWM optimization Range: 000 - 021
Factory default:
Unit's place: PWM carrier frequency adjusted with temperature
0: Auto-adjust
1: No adjustment
When automatic adjustment of PWM carrier frequency is selected, the drive will
automatically reduce carrier frequency with the temperature rise, protecting itself against
overtemperature. Set to 1 where PWM carrier frequency change is not allowed.
Decade: PWM modulation mode
0: five-segment and seven-segment automatic switchover
1: five-segment mode
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