YASKAWA Varispeed G7 Series Instruction Manual page 194

Stall Prevention: L3
User constants for the stall prevention function are shown in the following table.
Con-
stant
Number
Stall pre-
vention
selection
during accel
L3-01
StallP
Accel Sel
Stall pre-
vention
level during
accel
L3-02
StallP
Accel Lvl
Stall pre-
vention
limit during
L3-03 accel
StallP CHP
Lvl
Stall pre-
vention
selection
during
decel
L3-04
StallP
Decel Sel
-62
5
Name
Description
Display
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
prevention 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.
0: Disabled (Deceleration as
set. If deceleration time is
too short, a main circuit
overvoltage may result.)
1: Enabled (Deceleration is
stopped when the main
circuit voltage exceeds the
overvoltage level.
Deceleration restarts when
voltage is returned.)
2: Intelligent deceleration
mode (Deceleration rate is
automatically adjusted so
that the Inverter can
decelerate in the shortest
possible time. Set
deceleration time is
disregarded.)
3: Enabled (with Braking
Resistor Unit)
When a braking option (Brak-
ing Resistor, Braking Resistor
Unit, Braking Unit) is used,
always set to 0 or 3.
Control Methods
Change
Setting Factory during
Range Setting Opera-
V/f with
tion
0 to 2 1 No A
0 to
150% No A
200
0 to
50% No A
100
0 to 3
1 No Q
*1
MEMO-
Open Open
BUS
V/f Loop Flux Loop
Regis-
Vec- Vec- Vec-
ter
PG tor tor tor
1 2
A A No No 48FH
A A No No 490H
A A No No 491H
Q Q Q Q 492H
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