Alpha 6000S series User Manual page 145

Chapter 5 Detailed Function Introductions

When the setting is 1, frequency inverter outputs according to the setting torque. At this time, the output
frequency automatically matches with the load speed, but limited by the Upper limit frequency limit. When
the load speed is greater than the upper limit frequency, the frequency inverter output frequency is limited.
The output torque is different from the setting torque.

When in torque control, torque command is the torque limit, which is set by the torque upper limit source.
You can switch through multi function input terminal torque and speed mode. When in torque control, the
frequency inverter output automatic tracking load speed changes, but the output frequency change speed is
influenced by the setting acceleration and deceleration time. If it needs accelerate tracking speed, you
should shorten deceleration time. When the setting torque of the frequency inverter is greater than the load
torque, the frequency inverter output frequency will rise. When the frequency inverter output frequency
reaches the upper limit frequency, frequency inverter will be operated at upper limit frequency. When the
setting torque of the frequency inverter is less than the load torque, the frequency inverter output frequency
will decrease, but not limited by the lower limiting frequency limit.

When the setting is 2, operates according to the torque motor mode. The main feature of the torque motor is
soft mechanical property. It can be rotor-blocking. When the load torque increases, it can automatically
reduce the speed.
P8.11 Torque upper limit source
0: Digital setting
2: AI2
4: Pulse input
P8.12 Upper Limit of Driving Torque
P8.13 Upper Limit of Brake Torque
Explanation:

If the driving torque source is digitally set, what P8.12 AND p8.13 set will be the actual torque values.
P8.14 Command Slip Compensation Factor
Notes:

With the vector control manner, the parameter makes compensation for the torque command. The output
current can be changed by revising the parameter. Generally, revision is not suggested.
P8.15 Torque acceleration time
P8.16 Torque deceleration time
Explanation:

Set the torque acceleration and deceleration time in torque mode. This function is invalid in the speed mode.

The time that torque from 0 to rated torque is torque acceleration time. The time from rated torque to 0 is
torque deceleration time
P8.17 Driving slip compensation gain
Notes:
For the speed-sensor-free vector control, if the load operation is unstable at the low speed, the parameter can
be increased appropriately.
P8.18 Brake slip compensation gain
Notes:
For the speed-sensor-free vector control, the parameter is used to adjust the stable-speed precision of motor: if
the speed is low when the motor is loaded, the parameter should be increased; if the speed is high, the
parameter should be reduced.
P8.19 Zero servo function enable
(reserve)
0: Zero servo function prohibited
144
Setting range: 0~5 [0]
1: AI1
3: AI3 (Reserved for 3004GB and the below)
5: Serial communication
Setting range: 0.0%~200.0% [160%]
Setting range: 0.0%~200.0% [160%]
Setting range: 0.0%~200.0% [102.4%]
Setting range: 0.00~120.0s [0.5s]
Setting range: 0.00~120.0s [0.5s]
Setting range: : 50.0%~200.0% [130.0%]
Setting range: : 50.0%~200.0% [117.0%]
Setting range:
1: Zero servo function permitted [0]