range setting
V/f
Control
V/f with
PG
Open Loop
Vector
Flux
Vector
d5-05 Speed Lmt Bias 0 to 120 % 10 Not applicable. Advanced
Note This parameter cannot be changed during operation.
Set the speed limit bias as a percentage of the maximum frequency. (The max. frequency is
100%.)
The speed limit bias can be used to add margins to the speed limit.
When
the speed limit bias is used, it is possible to set the same speed limit value in both the for
-
ward
and reverse directions. For example, the following settings establish speed limits of 50%
of
the maximum frequency in both the forward and reverse directions.
Speed limit setting: Zero (with d5-04 as the speed limit: d5-03 = 2, d5-04 = 0)
Speed limit bias setting: 50% (d5-05 = 50)
When
a forward speed limit and a speed limit bias have been set, the speed range of the torque
control
is from the “–speed limit
bias setting” to the “speed limit setting + speed limit bias setting.” In
effect, the speed limit range is extended by the speed limit bias in both the forward and reverse
directions.
When the speed exceeds the reverse
speed limit, the torque is increased in
the forward direction.
Reverse
rotation
Forward
rotation
Motor speed
Torque reference value
Output torque Forward
direction
Reverse
direction
When the speed exceeds the forward
speed limit, the torque is increased in
the reverse direction.
Effective range of
torque control
Speed limit setting
Limit opposite
to speed limit
setting
d5-05 d5-05
H Torque Reference Adjustment
D Primary Delay Time Constant for Torque Reference Filter
• The time constant of the primary filter in the torque reference section can be adjusted.
Advanced Operation Chapter
6
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