Lenze 8400 motec - Drive

Firmware ≤ 02.00 - DMS 2.1 EN - 03/2011 L 91
8400 motec | Software Manual
Motor control (MCTRL)
V/f control (VFCplus + encoder)
 How to adapt the slip regulator gain to the operating conditions:
1. Adapt the slip regulator gain (C00972
) to the encoder increment according to table
[5-1]
.
2. Set controller limitation (C00971/1
) to half the slip frequency (≈ 2Hz).
3. Select speed setpoint (e.g. 20 % of the rated speed).
4. Enable controller.
5. Increase slip regulator gain (C00972
) until the drive becomes semi-stable.
• This can be recognised by motor noises or "humming" of the motor or by a noise
on the actual speed signal.
6. Reduce slip regulator gain (C00972
) until the drive runs stable again (not motor
"humming").
7. Reduce slip regulator gain (C00972
) to approx. half the value.
• With low encoder resolutions, another reduction of the slip regulator gain for
low speeds may be necessary (speed setpoint
≈ 0).
• It is recommended to check as a final step the behaviour at setpoint speed = 0
and further reduce the slip regulator gain in case of irregular running.
8. Increase controller limitation (C00971/1
) again (e.g. to double the slip frequency).
Slip regulator time constant Ti
 How to set the slip regulator time constant:
1. Set controller limitation (C00971/1
) to half the slip frequency (≈ 2Hz).
2. Select speed setpoint (e.g. 20 % of the rated speed).
3. Enable controller.
4. Reduce slip regulator time constant (C00973
) until the drive becomes semi-stable.
• This can be recognised by engine noises or motor "oscillating" or by oscillation
on the actual speed signal.
5. Increase slip regulator time constant (C00973
) until the drive runs stable again (no
motor "oscillation").
6. Increase slip regulator time constant (C00973
) to approx. double the value.
7. Increase controller limitation (C00971/1
) again (e.g. to double the slip frequency).