Startup Torque Compensation - Omron SYSDRIVE 3G3FV User Manual

Advanced Operation

6-1-6 Startup Torque Compensation

With open-loop vector control, a starting-torque compensation can be input to decrease the torque ref-
erence's rise time at startup.
This function is effective for equipment in which a starting torque is required, such as machinery with a
high friction load or cranes. Unlike flux vector control, the compensation is input only at startup.
H Starting-torque Compensation Function
Parameter Display name p y
number
C4-03 F TorqCmp@start
C4-04 R TorqCmp@start –200.0 to 0.0 0.1%
C4-05 TorqCmp Delay T
These parameters cannot be changed during operation.
Timing Chart
Frequency reference
Run command
Torque compensation value
Output frequency
When using this compensation function, set the starting-torque compensation value to the friction load
in regular machinery or the lifting/lowering load for machinery such as cranes.
Friction loads:
Set the friction load in both C4-03 and C4-04.
Lifting/lowering load:
Set the electrically driven (winding) load only. (When the lifting machinery is equipped with a coun-
terweight, a shock may be generated if there is a regenerative load so do not use this function.)
It is only possible to set the electrically driven compensation in both forward and reverse. (The regen-
erative setting cannot be made.)
The starting-torque compensation is not applied when switching between forward and reverse or after
a speed search.
The starting-torque compensation is usually not applied when using a second motor.
Setting g
range
0.0 to 200.0
0 to 200
E1-09
Note The Inverter's torque reference value is at its lower limit
with the torque compensation value shown above.
Settings
Units Default
setting
V/f
Control
0.1% 0.0 ---
0.0 ---
1 ms 10 ---
Time constant: C4-02
C4-03 (forward)
C4-04 (reverse)
C4-05 4
Chapter 6
Valid access levels
V/f with Open Loop
PG Vector
Advanced
Advanced
Advanced
Larger of b2-01
Flux
Vector
---
---
---
and E1-09
6-7