7-89
Stall Prevention Selection During Decel: L3-04
User
Change
Valid Access Levels
Constant
Number
Name
during
Opera-
tion
Setting
Range
Unit
Factory
Setting
V/f
Control
V/f with
PG
Open
Loop
Vector
Flux
Vector
L3-04
Stall prevention
selection during de-
cel
×
0to3 − 1
B B B B
D
Settings
Setting Function
0
Disabled. (Decelerate according to the settings. Main circuit overvoltage may occur if the decel-
eration time is too short.)
1
Enabled. (Stops deceleration if the main circuit voltage exceeds the overvoltage level. Decelerate
again when voltage recovers.)
2
Optimum deceleration. (Decelerate as fast as possible judging from the main circuit voltage.
Disregard the deceleration time setting.)
3
Enabled (with braking resistor)
D
When setting 1 (enabled) is selected, the deceleration time is extended automatically so that a main
circuit overvoltage doesn’t occur.
D
Always select setting 0 or 3 when a braking option (Braking Resistor, Braking Resistor Unit, or Brak-
ing Unit) is being used. If setting 1 or 2 is selected, the braking option won’t be used and the decelera-
tion time can’t be shortened.
D
L3-04 cannot be set to 2 for open-loop vector control mode. (Settings can be made for SPEC:F and
later)
D
L3-04=3 cannot be set in open-loop vector control mode.
The deceleration time is controlled
to prevent overvoltage.
Output frequency
Time
Deceleration time
(setting)
Fig 7.49 Deceleration Stall Prevention Function: L3-04 = 1
Stall Prevention Selection During Running: L3-05
User
Change
Valid Access Levels
Constant
Number
Name
during
Opera-
tion
Setting
Range
Unit
Factory
Setting
V/f
Control
V/f with
PG
Open
Loop
Vector
Flux
Vector
L3-05
Stall prevention
selection during run-
ning
×
0to2 − 1
B B
× ×
D
Settings
Setting Function
0
Disabled. (Run according to the settings. Stalls may occur with large loads.)
1
Enabled − deceleration time 1. (Use deceleration time in C1-02 for stall prevention function.)
2
Enabled − deceleration time 2. (Use deceleration time in C1-04 for stall prevention function.)
D
When setting 1 or 2 (enabled) is selected, deceleration is started if the current of the stall prevention
level during operation continues for more than 100 ms. The motor is accelerated back to the reference
frequency again when the current falls below this level.
7
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