6
-112
Speed Limit Bias Setting
The speed limit bias can be set to limit both the forward and reverse speed to the same value. This differs from
the operation of the speed limit setting. To use the speed limit bias, set d5-04 to 0 and set the bias in d5-05 as a
percentage of the maximum output frequency.
To set 50% forward and reverse speed limits, set the speed limit setting to 0 (d5-03 = 2, d5-04 = 0, and d5-05
= 50). The range of torque control will be from -50% to 50% of the maximum output speed.
When using both the speed limit and the speed limit bias, the range of torque control will be positive and neg-
ative speed limits with the speed limit bias added to each.
The range of torque control when the forward speed limit is 50% and the speed limit bias is 10% is shown in
the following figure. This figure does not take the priority circuit into account.
Fig 6.68 Speed Limit Bias Setting
Option card (AI-14B)
(0 to ±10 V)
Between TC1 and TC4
b1-01 = 3
F2-01 = 0
If H3-09 is set to 0, the sum of the input
between TC2 and TC4 will be added the
input between TC1 and TC4 to determine
the speed limit.
IMPORTANT
The direction in which speed is controlled is determined by the sign of the speed limit signal and the direction
of the Run Command.
• Positive voltage applied: The speed in the forward direction will be limited for forward operation.
• Negative voltage applied: The speed in the reverse direction will be limited for reverse operation.
If the direction of motor rotation and the command direction are not the same, speed will be limited to 0 as
long as b5-05 is set to 0.
Speed Limit Input Method
Location of
Reference
Parameter
Settings
Remarks
Positive torque
Negative torque
Reverse
operation
Forward
operation
Speed Limit Bias
(d5-05) 10%
Speed Limit at forward
operation side
(d5-04) 50%
Δ
N%
Δ
N is set as follows:
Motoring operation:
Torque reference (%)
C5-01
Regeneration operation:
or d5-05 that is smaller.
Torque reference (%)
C5-04
