YASKAWA ELECTRIC
SIEP C710617 19A YASKAWA AC Drive CR700 Technical Manual
709
The Stall Prevention function does not operate during acceleration, and acceleration occurs for the set acceleration
time. If the acceleration time is too short, the motor does fully accelerate during the set time, which causes the
drive to detect
oL1
or
oL2
and the motor to stop.
1 : Enabled
Enables the Stall Prevention During Acceleration function. Operation is different for different control methods.
•
V/f Control or OLV Control
When the output current is more than the value set in
L3-02 [Stall Prevent Level during Accel]
, the drive stops
acceleration. When the output current is less than the value set in
L3-02
- 15%, the drive starts to accelerate
again. The Stall Prevention function level automatically falls for constant output ranges.
Figure 11.89 Stall Prevention During Acceleration when Using Induction Motors
2 : Intelligent (Ignore Accel Ramp)
The drive ignores the acceleration time setting and the drive starts to accelerate in the minimum length of time.
The drive automatically adjusts the acceleration rate and the output current will not be more than the value set in
L3-02
.
3 : Current Limit Method
This function limits the output current with the value set for
L3-02
and automatically adjusts the acceleration rate.
When the load (output current) increases to more than the current limit level during acceleration, the drive
automatically adjusts the acceleration rate.
Figure 11.90 Current Limit Method
L3-02: Stall Prevent Level during Accel
No.
(Hex.)
Name
Description
Default
(Range)
L3-02
(0490)
Stall Prevent Level
during Accel
Sets the output current level used when the Stall Prevention function is
enabled during acceleration, as a percentage of the drive rated output
current.
Determined by L8-38
(0 - 150%)
V/f
CL-V/f
OLV
CLV
AOLV
