Chapter 4 Parameters|
Revision Jan. 2009, 06EE, SW--PW V1.12/CTL V2.12 4-135
This parameter sets the DC-bus voltage at which the brake chopper is activated. Users can
choose the suitable brake resistor to have the best deceleration. Refer to appendix B for the
information of the brake resistor.
This parameter will be invalid for Frame A models (VFD002E11A/21A/23A,
VFD004E11A/21A/23A/43A, VFD007E21A/23A/43A and VFD022E23A/43A) without brake
chopper for which BUE brake unit must be used.
08.20
Compensation Coefficient for Motor Instability
Unit: 0.1
Settings 0.0~5.0 Factory Setting: 0.0
In V/f control mode, the drift current may cause slight motor vibration in the slip compensation
or torque compensation. It can be ignored if this slight vibration doesn’t affect the application.
The drift current will occur in a specific zone of the motor and it will cause serious motor
vibration. It is recommended to use this parameter(the recommended value is 2.0) to improve
this situation greatly.
The drift current zone of the high-power motors is usually in the low frequency area.
It is recommended to set to more than 2.0.
08.21
OOB Sampling Time
Unit: 0.1
Settings 0.1 to 120.0 sec Factory Setting: 1.0
08.22 Number of OOB Sampling Times Unit: 1
Settings 0.00 to 32 Factory Setting: 20
08.23 OOB Average Sampling Angle
Settings Read-only Factory Setting: #.#
The OOB (Out Of Balance Detection) function can be used with PLC for washing machine.
When multi-function input terminal is enabled (MI=26), it will get Δθ value from the settings of
Pr.08.21 and Pr.08.22. PLC or the host controller will decide the motor speed by this t Δθ
value (Pr.08.23). When Δθ value is large, it means unbalanced load. At this moment, it needs
to lower the frequency command by PLC or the host controller. On the other hand, it can be
high-speed operation.
Related parameters: Pr.04.05(Multi-function Input Terminal (MI3)), 04.06(Multi-function Input
Terminal (MI4)), Pr.04.07(Multi-function Input Terminal (MI5)) and Pr.04.08(Multi-function Input
Terminal (MI6))
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