4-3 Functions When Multi-function Feedback Option Board (3G3AX-PG01) Is Used •If sensor vector control cannot provide the desired characteristics, adjust the motor parameters depending on the phenomena, as shown in the table below. 4 Functions Note 1: Make sure that the carrier frequency (b083) is not lower than 2.1 kHz. If the carrier frequency is at 2.1 Hz or lower, the Inverter does not operate normally. Note 2: To use a lower rank motor size than the Inverter, set a torque limit value (b041 to b044), while keeping the value α , calculated with the following formula, at 200% or lower. Otherwise, the motor may burn out.
α = Torque limit set value Ч (Inverter capacity) / (Motor capacity) (Example) If the Inverter capacity is 0.75 kW and the motor capacity is 0.4 kW, the torque limit set value for α = 200%, calculated with the above formula, is as follows: Torque limit set value (b041 to b044) = α Ч (Motor capacity) / (Inverter capacity) = 200% Ч (0.4 kW)/(0.75 kW) = 106% Torque Bias Function •This function applies bias to the torque reference generated by speed control, and is useful for elevating applications (e.g. elevator). *1. When torque bias is set to the FE terminal, -10 to +10 (V) is recognized as -200 to +200 (%). *2. • When "00" (As per sign) is selected:
When the polarity of a torque bias signal is (+), the torque increases for forward rotation, and when it is (-), the torque increases for reverse rotation, regardless of the RUN direction. • When "01" (Depends on the RUN direction) is selected: The torque bias signal polarity and torque bias direction vary depending on the RUN command direction. Forward command: Applies torque in the same direction as the torque bias. Reverse command: Applies torque in the opposite direction of the torque bias. 4-118 Operation status Phenomenon Adjusting method Adjustment item During startup Shock occurs during startup. Reduce motor parameter J from the set parameter.
H024/H034 During deceleration Motor hunting Reduce the speed response. H005 Reduce motor parameter J from the set parameter. H024/H034 During torque limit Insufficient torque at low frequency during torque limit Set a overload limit level lower than that of the torque. b021 b041 to b044 Low-frequency operation Rotation is not constant. Increase motor parameter J from the set parameter. H024/H034 Related functions A001, A044, F001, b040 , H002, H003, H004 , H020 , H021 , H022 , H023 , H050 , H051 , H052 , P011, P012 Parameter No. Function name Data Default setting Unit P036 Torque bias mode 00: Disabled 01: Set via the Digital Operator 02:
Set via terminal FE *1 00 P037 Torque bias value -200 to +200: Enabled when P036 = 01 0. % P038 Torque bias polarity selection *2 00: As per sign 01: Depends on the RUN direction 00 Related functions d010