Omron SYSDRIVE 3G3FV, User Manual, Page: 202 / 400

6-28
During the timer delay, the value of the 3 analog inputs will retain the values they had when the ON/OFF
status of speed/torque control switching signal was changed. Use this delay to make any preparations
for the change in the control mode.
Parameter Display name Setting Units Default
Valid access levels
number
p y g
range setting
V/f
Control
V/f with
PG
Open Loop
Vector
Flux
Vector
d5-06 Ref Hold Time 0 to 1000 ms 0 Not applicable. Advanced
H
Frequency Reference and Speed Limit
The frequency reference (during speed control) is set with b1-01 (Reference Source).
The speed limit (during torque control) is set with d5-03 (Speed Limit Selection).
It is possible to assign the frequency reference and speed limit functions to the same analog input termi-
nal (13 or 14).
H
Torque Reference and Torque Limit
If the torque reference has been assigned to a multi-function analog input or the frequency reference
(current) terminal, the input’s function changes when the control mode is switched between torque con-
trol and speed control.
•
During speed control: The analog input terminal is used as the torque limit input.
•
During torque control: The analog input terminal is used as the torque reference input.
Either the absolute value of the torque limit input or the torque limit parameter setting (L7-01 through
L7-04), whichever is smaller, will be used for the torque limit.
H
Stopping Method
When the run command is turned OFF during speed control, the motor is decelerated to a stop.
When the run command is turned OFF during torque control, the control mode is automatically switched
to speed control and the motor is decelerated to a stop.
6-3-6 Torque Limit Function
With flux vector control, the torque limit can be applied at an arbitrary value because the
torque output by the motor is calculated internally.
The torque limit function is useful when the load cannot sustain a torque above a certain
level or regenerative torque above a certain level. The two ways to apply a torque limit
are listed below. (The lower torque limit will be used if both of these methods are set.)
1) Setting a torque limit with the parameters
2) Limiting torque with the analog inputs
The precision of the torque limit is
±
5% at all frequencies.
Advanced Operation
Chapter 6