Adjusting Speed Feedback - Omron SYSDRIVE 3G3FV User Manual

Advanced Operation
The following diagram shows the relationship between the output torque and each torque limit.
Regenerative torque limit
Reverse
Reverse torque limit
Note 1. When the forward torque limit has been set, the analog input signal acts as the limit value for
torque generated in the forward direction. The torque limit input is effective when torque is
generated in the forward direction even if the motor is operating in reverse (regenerative
torque).
Note 2. The torque limit is 100% of the motor's rated torque when the analog input is at its maximum
value (10 V or 20 mA). To increase the torque limit above 100%, set the input terminal's gain
above 100%. For example, a gain of 150.0% would result in a torque limit of 150% of the mo-
tor's rated torque with a 10-V or 20-mA analog input.

6-1-3 Adjusting Speed Feedback

With open-loop vector control, internal Inverter data is used to calculate the feedback
value. The gain of this automatic frequency regulator (AFR) operation can be fine-tuned
according to motor response. (Normally it isn't necessary to change the default setting.)
Parameter Display p y
number name
C8-08 AFR Gain 0.00 to 10.00 Factor
Parameter Display p y
number name
C8-09 AFR Time 0 to 2000
Note 1. The default settings do not normally need to be changed.
Note 2. Fine-tune the gain or time constant if the rotation of the motor is unstable, causing hunting to
occur, or the torque and speed responsiveness of the motor is low.
Set parameter C8-09 to a larger value if hunting occurs. Set the parameter C8-08 to a smaller
value if hunting cannot be suppressed with the parameter C8-09.
Set parameter C8-09 to a smaller value within a range where no hunting occurs if the torque
and speed responsiveness of the motor are low. To increase the gain, set parameter C8-08 to a
larger value within a range where no hunting occurs.
Output torque
Setting g Units
range
Setting g Units
range
ms
Forward direction
Forward torque limit
Regenerative torque limit
Reverse direction
Valid access levels
Default
setting
V/f V/f with
Control PG
1.00 ---
Valid access levels
Default
setting
V/f V/f with
Control PG
50 ---
Chapter 6
Forward
Open Loop Flux
Vector Vector
Advanced ---
Open Loop Flux
Vector Vector
Advanced ---
6-5