Stall Prevention During Acceleration - Omron VARISPEED L7 Manual

Applying an Output Speed Dwell
The dwell function at start is applied when the speed level set in parameter b6-01 is reached. The dwell speed
is kept for the time set in parameter b6-02. The dwell function at stop is applied when the speed reaches the
level set in parameter b6-03. The dwell speed is kept for the time set in parameter b6-04. The setting is shown
in Fig 6.7.

Stall Prevention During Acceleration

The Stall Prevention During Acceleration function prevents the motor from stalling if the load is too heavy.
If L3-01 is set to 1 (enabled) and the Inverter output current reaches 85% of the set value in L3-02, the accel-
eration rate will begin to slow down. When L3-02 is exceeded, the acceleration will stop.
If L3-01 is set to 2 (optimal adjustment), the motor accelerates so that the current is held at the level set in L3-
02. With this setting, the acceleration time setting is ignored.
Related Parameters
Parameter
No.
L3-01 Stall prevention selection during acceleration
L3-02 Stall prevention level during acceleration
Run command
ON
Output frequency
b6-01 b6-03
b6-02
Fig 6.7 Output Frequency Dwell Settings
Factory
Name
OFF
Time
b6-04
Control Methods
Change
during
Setting
V/f
Operation
1 No A
150% No A
Closed
Open Closed
Loop
Loop Loop
Vector
Vector Vector
(PM)
A - -
A - -
6-
6
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