Delta VFD300C43S-HS User Manual page 446

Chapter 12 Description of Parameter SettingsC2000-HS

If entering the low magnetic area and the input voltage (or DC BUS) plummets (e.g. an unstable
power net causes instant insufficient voltage, or a sudden load that makes DC BUS drop), which
causes the ACR diverge and oc, then increase the gain. If the Id value of a spur creates large
noise in high-frequency output current, decrease the gain to reduce the noise. Decrease the gain
will slow down the response.
PM Sensorless Control Word

Settings
bit No.
2 Choose a control mode to start.
3 Choose a mode to stop.
5 Choose a control mode to stop
Frequency Point to Switch from I/F Mode to PM Sensorless Mode

Settings

The upper limit is the same as the maximum operation frequency for Pr.01-00.

Sets the frequency for the switch point from low frequency to high frequency.

If the switch point is too low, the motor does not generate enough back-EMF to let the speed
estimator measure the rotor right position and speed, and causes stall and oc when running at
the switch point frequency

If the switch point is too high, the active area of I/F is too wide, which generates more current and
cannot save energy. If the current value for Pr.10-31 is too high, the high switch point makes the
drive continue to output with the setting value for Pr.10-31.
Frequency Point to Switch from PM Sensorless Mode to I/F Mode

Settings

The upper limit is the same as the maximum operation frequency for Pr.01-00.

Sets the switch point from high frequency to low frequency.

If the switch point is too low, the motor does not generate enough back-EMF to let the speed
estimator measure the rotor right position and speed when running at the switch point frequency.

If the switch point is too high, the active area of I/F is too wide, which generates more current and
cannot save energy. If the current of Pr. 10-31 is too high, the high switch point makes the drive
continue to output with the setting value for Pr. 10-31).
0000–FFFFh
Function
0.0–1500.0 Hz
0.0–1500.0 Hz
Description
0: Start in IF mode
1: Start in VF mode
0: Stop in IF mode
1: Stop in VF mode
0: When lower than Pr. 10-40, coast to stop
1: When lower than Pr. 10-40, ramp to stop
12.1-10-9
Default: 0000h
Default: 20.0
Default: 20.0