Preventing The Motor From Stalling During Acceleration (Stall Prevention During Acceleration Function) - YASKAWA Varispeed E7 Instruction Manual And Parameter Description

Preventing the Motor from Stalling During Acceleration
(Stall Prevention During Acceleration Function)
The Stall Prevention During Acceleration function prevents the motor from stalling if a heavy load is applied
to the motor, or sudden rapid acceleration is performed.
If you set L3-01 to 1 (enabled) and the Inverter output current reaches 85 % of the set value in L3-02, the
acceleration rate will begin to slow down. When L3-02 is exceeded, the acceleration will stop.
If you set L3-01 to 2 (optimum adjustment), the motor accelerates so that the current is held at a level of 50 %
of the inverter rated current. With this setting, the acceleration time setting is ignored.
Related Parameters
Con-
stant
Number
Stall prevention selection during
L3-01
acceleration
Stall prevention level during
L3-02
acceleration
Time Chart
The following figure shows the frequency characteristics when L3-01 is set to 1.
-18
6
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Name
0: Disabled (Accelerates according to the setting. Motor
may stall if the load is too high.)
1: Enabled (Acceleration stops when the level set in
L3-02 is exceeded. Acceleration continues when
current value falls below the level set in L3-02.)
2: Optimum adjustment (Adjusts acceleration using the
current level set in L3-02 as reference. The
acceleration time setting is ignored.)
Set as a percentage taking the Inverter rated current to be
100%.
Normally, it is not necessary to change this setting. Lower
the set value if the motor stalls using the factory setting.
Output current
Stall level during
acceleration
Output frequency
*1.
* 1. The acceleration rate is lowered.
* 2. The acceleration is stopped to reduce the output current.
Fig 6.18 Time Chart for Stall Prevention During Acceleration
Setting
Description
Range
0 to 200
*2.
Change
Factory during Access
Setting Opera- Level
tion
0 to 2 1 No A
120% No A
Time
Time