Preventing The Motor From Stalling During Acceleration (Stall Prevention During Acceleration Function) - YASKAWA Varispeed G7 Series Instruction Manual


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 placed
on the motor, or sudden rapid acceleration is performed.
If you set L3-01 to 1 (enabled) and the Inverter output current exceeds the -15% level of the set value in L3-
02, the acceleration rate will begin to slow down. When L3-02 is exceeded, acceleration will stop.
If you set L3-01 to 2 (optimum adjustment), the motor current accelerates to the value set in L3-02. With this
setting, the acceleration time setting is ignored.
Related Parameters
Name
Con-
stant
Display
Number
Stall preven-
tion selection
during accel
L3-01
StallP Accel Sel
Stall preven-
tion level
during accel
L3-02
StallP Accel
Lvl
Stall preven-
tion limit
during accel
L3-03
StallP CHP Lvl
Description
0: Disabled (Acceleration as set.
With a heavy load, the motor
may stall.)
1: Enabled (Acceleration
stopped when L3-02 level is
exceeded. Acceleration starts
again when the current is
returned.)
2: Intelligent acceleration mode
(Using the L3-02 level as a
basis, acceleration is
automatically adjusted. Set
acceleration time is
disregarded.)
Effective when L3-01 is set to 1
or 2.
Set as a percentage of Inverter
rated current.
Usually setting is not necessary.
The factory setting reduces the set
values when the motor stalls.
Sets the lower limit for stall pre-
vention during acceleration, as a
percentage of the Inverter rated
current, when operation is in the
frequency range above E1-06.
Usually setting is not necessary.
Acceleration and Deceleration Characteristics
Control Methods
Change
Setting Factory during
V/f
Range Setting Opera-
V/f with
tion
PG
0 to 2 1 No A A
0 to
150% No A A
200
0 to
50% No A A
100
MEMO
Open Open
BUS
Flux
Loop Loop
Regis-
Vec-
Vector Vector
ter
tor
1 2
A No No 48FH
A No No 490H
A No No 491H
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