Omron SYSDRIVE 3G3RV, User Manual

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Acceleration and Deceleration Characteristics
6-
25
K K K K
Preventing Overvoltage During Deceleration (Stall Prevention During
Deceleration Function)
The
Stall Prevention During Deceleration function makes the rate of deceleration more gentle to suppress
increases
in DC bus voltage when the DC bus voltage exceeds the set value during motor deceleration.
This
function automatically lengthens the deceleration time with respect to the bus voltage, even if the decel-
eration
time has been set to a considerably small value.
If
L3-04 is set to 1 or 2, when the main circuit DC voltage approaches the stall prevention level during decel-
eration,
deceleration stops, and when deceleration falls below the level, is restarted. Using this operation,
deceleration
time is automatically lengthened. If L3-04 is set to 1, deceleration time returns to the set value,
and
if L3-04 is set to 2, deceleration is automatically adjusted to a faster deceleration time within the range of
the
stall prevention level during deceleration.
n
Related Parameters
Param-
eter
Num-
ber
Name
Description
Setting
Range
Factory
Setting
Change
during
Opera-
tion
Control Methods
V/f
V/f
with
PG
Open
Loop
Vec-
tor
LCD Display
L3-04
Stall
prevention selection
during
deceleration func-
tion
selection
0:
Disabled (Motor decelerates according to
setting.
When the deceleration time is short,
there
is a risk of main circuit overvoltage (0V)
occurring.)
1:
Enabled (Prevents deceleration when main
circuit
voltage reaches the overvoltage level.
Deceleration
restarts after voltage has been
restored.)
2:
Intelligent deceleration mode (Minimizes
deceleration
judging from main circuit
voltage.
The deceleration time setting is
ignored.)
3:
Enabled (with dynamic braking)
If
using the dynamic brake option (braking resis-
tor,
Braking Resistor Units, and Braking Units), be
sure
to set parameter L3-04 to 0 or 3.
0
to 3
1 No Q Q Q
StallP
Decel Sel