Alpha 6000S series User Manual page 146

P8.20 Zero servo initial frequency
(reserve)
P8.21 Zero servo gain (reserve)
P8.22Zero servo tolerance (reserve)
Notes:
Parameters related to zero-servo are reserved temporarily.
P8.23 Zero-speed Torque Boosting
P8.24 Zero-speed Threshold
Notes:

P8.23 zero-speed torque boosting is to provide the additional output torque at the startup, so the motor can
overcome the static friction and start smoothly when the set torque is small.

The zero-speed threshold setting range corresponds to the 0~20% maximum output frequency.
P8.25 Brake Torque Setting Source
0: consistent with the final setting value of
driving torque calculated with P8.11
2: AI2
4: Impulse Input
P8.26 High-speed Torque Make-up Gain
P8.27 High-speed Torque Make-up Base
0: Make-up based on the operation frequency
Notes:

As the operation speed increases, the mechanical system will consume more and more torque, and the
high-speed torque is to make up for the torque consumed by the mechanical system to keep basically
unchanged the torque gained by the effective load.

What P8.26 sets is the maximum make-up and 100.0% corresponds to the rating output torque of motor.
When the make-up base is "make-up based on the operation frequency", the relationship between the torque
make-up and the present operation frequency is showed in Figure 5-8-2:
Figure 5-8-2 Relationship between the High-speed Torque Make-up and the Output Frequency
P8.28 Pre-excitation Time
Notes:

The function of pre-excitation is used to establish the magnetic field before the asynchronous motor starts.
The parameter sets the duration time of this process.
145
Setting range: 0.00~10.00Hz [0.30Hz]
Setting range:1. 0~99.99(G5) [1.00]
Setting range: 0~16383 [10]
Setting range: 0.0~50.0% [0.0%]
Setting range: 0~20% [5%]
Setting Range: 0~5 [0]
1: AI1
3: AI3 (3004GB and the below are reserved)
5: Serial Communications
Setting range: 40.0~160.0% [0.0%]
Setting range: 0~1 [0]
1: Make-up based on the linear speed (Reserved)
Torque Make-up
转矩补偿量
Maximum
最大补偿量
（P8.26） Make-up
(P8.26)
0
Setting Range: 0.00~120.0s [0.5s]
Chapter 5 Detailed Function Introductions
Operation Frequency (Hz)
运行频率(Hz)
Maximum Output
最大输出频率
Frequency