YASKAWA VARISPEED-616G5, Instruction Manual

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D
L2-06
¸
0
The motor is decelerated to the KEB frequency level using the momentary power loss ridethru time
(L2-02) and then is accelerated to the original frequency reference using acceleration time 1 (C1-01).
The KEB frequency level is calculated from the KEB frequency rate using the following equation.
KEB frequency level = Output frequency before power loss [1
− (setting of L2-06)/100)]%
KEB command
OFF
ON
OFF
(H1-01 to H1-06 = 65 or 66)
Output frequency
Momentary power loss ride-thru time(L2-02)
KEB frequency level
J
Stall Prevention Function Settings: L3-01 to L3-06
D
A stall occurs if the rotor cannot keep up with the rotating magnetic field on the motor stator side when
a large load is applied to the motor or a sudden acceleration/deceleration is performed.
D
In the Inverter, stall prevention functions can be set independently for accelerating, running, and decel-
erating. (Some functions are restricted depending on the control method.)
Stall Prevention Selection During Acceleration: L3-01
User
Change
during Setting Factory
Valid Access Levels
User
Constant
Number
Name
g
during
Opera-
tion
Setting
Range
Unit Factory
Setting
V/f
Control
V/f with
PG
Open
Loop
Vector
Flux
Vector
L3-01
Stall prevention
selection during ac-
cel
×
0 to 2 − 1 B B B
×
D
Settings
Setting Function
0 Disabled. (Accelerate according to the settings. Stalls may occur with large loads.)
1
Enabled. (Stop acceleration if L3-02 setting is exceeded. Accelerate again when current recov-
ers.)
2 Optimum acceleration (Adjust acceleration so that the L3-02 isn’t exceeded by much. Disregard
the acceleration time setting.)
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When setting 1 (enabled) is selected, acceleration is stopped if the motor current exceeds the accelera-
tion stall prevention level. Acceleration is started again when the current falls below this level. The
acceleration time can be longer than the setting depending on the load.
D
When setting 2 (optimum acceleration) is selected, acceleration is performed using the acceleration
stall prevention level as a basis. In this case, the acceleration time is disregarded.
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