6-23
6
îš‹ Accelerating and Decelerating Heavy Loads (Dwell Function)
The dwell function holds the output frequency temporarily when starting or stopping heavy loads. When using
the dwell function, deceleration to stop must be set as stopping method (b1-03 = 0).
îš„Related Parameters
îš„Applying an Output Frequency Dwell
An output frequency dwell can be applied to prevent a stalling of the motor at start if the static friction and the
inertia are large or to prevent a coasting of the motor at stop. The frequency level at which the dwell function
starts can be set separately for the start and the stop in the parameters b6-01 and b6-03. The times can be set in
the parameters b6-02 and b6-04 (refer to Fig 6.26)
Fig 6.26 Output Frequency Dwell Settings
îš‹ Preventing the Motor from Stalling During Acceleration (Stall Prevention
During Acceleration Function)
The Stall Prevention During Acceleration function prevents the motor from stalling if a heavy load is applied
to the motor, or sudden rapid acceleration is performed.
If L3-01 is set to 1 (enabled) and the Inverter output current reaches 85 % of the set value in L3-02, the accel-
eration rate will begin to slow down. When L3-02 is exceeded, the acceleration will stop.
If L3-01 is set to 2 (optimum adjustment), the motor accelerates so that the current is held at the level set in
L3-03. With this setting, the acceleration time setting is ignored.
îš„Related Parameters
Parameter
No.
Name
Factory
Setting
Change
during
Opera-
tion
Control Methods
V/f
V/f with
PG
Open
Loop
Vector
Closed
Loop
Vector
b6-01Dwell frequency at start 0.0 HzNo AAAA
b6-02 Dwell time at start 0.0 s No AAAA
b6-03Dwell frequency at stop 0.0 HzNo AAAA
b6-04 Dwell time at stop 0.0 s No AAAA
Parameter
No.
Name
Factory
Setting
Change
during
Opera-
tion
Control Methods
V/f
V/f with
PG
Open
Loop
Vector
Closed
Loop
Vector
L3-01 Stall prevention selection during acceleration 1 No A A A No
L3-02 Stall prevention level during acceleration
150%
* 1
* 1. Shows the initial value when C6-01 is set to 0 (default). If C6-01 is set to 1 or 2, the initial value is 120%
No A A A No
L3-03 Stall prevention limit during acceleration 50% No A A A No
Run command
Output frequency
Time
ON
b6-03
OFF
b6-01
b6-04
b6-02
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