Yaskawa G5HHP Drive - Manual (Page 254)

Advanced Operation
7.5.6 Protective Functions: L
7 - 90
Stall Prevention Selection During Decel: L3-04
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
L3-04
Stall prevention selec-
tion during decel
x 0 to 2 -- 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. Dis-
regard the deceleration time setting.)
D
When setting 1 (enabled) is selected, the deceleration time is extended automatically so that a main cir-
cuit overvoltage doesn’t occur.
D
Always select setting 0 when a braking option (Braking Resistor, Braking Resistor Unit, or Braking
Unit) is being used. If setting 1 or 2 is selected, the braking option won’t be used and the deceleration
time can’t be shortened.
D
L3-04 cannot be set to 2 for vector control modes.
The deceleration time is controlled
to prevent overvoltage.
Output frequency
Time
Deceleration time
(setting)
Fig 7.45 Deceleration Stall Prevention Function: L3-04 = 1
Stall Prevention Selection During Running: L3-05
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
L3-05
Stall prevention selec-
tion during running
x 0 to 2 -- 1 B B x x
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 fre-
quency again when the current falls below this level.
7