YASKAWA A1000 Technical Manual page 208

5.4 d: Reference Settings

Speed Limitation and Speed Limit Bias
The speed limit setting is read from the input selected in parameter d5-03. A bias can be added to this speed limit using
parameter d5-05 while parameter d5-08 determines how the speed limit bias is applied.
between these settings.
Table 5.20 Speed Limit, Speed Bias and Speed Limit Priority Selection
Run Command Forward
Torque Reference
Positive (Forward) Positive (Forward) Negative (Reverse) Negative (Reverse) Negative (Reverse) Negative (Reverse) Positive (Forward) Positive (Forward)
Direction
Speed Limit
Positive (Forward) Negative (Reverse) Negative (Reverse) Positive (Forward) Positive (Forward) Negative (Reverse) Negative (Reverse) Positive (Forward)
Direction
Motor Rotation
Direction
Torque
Limit
Internal
Torque
Bidirectional Speed
Reference
Limit Bias
(d5-08 = 0)
<1>
Speed Limit
Bias d5-05
Torque
Limit
Internal
Torque
Unidirectional
Reference
Speed Limit Bias
(d5-08 = 1)
<1>
Speed
Limit Bias
d5-05
Line Direction
Application Example
<1> The value of delta n in the drawings depends on the ASR setting in parameters C5-.

Indicating Operation at the Speed Limit
A digital output can be programmed to close when the drives is operating at or beyond the speed limit (H2- = 32).
Use this output to notify a PLC or some other control device of abnormal operating conditions.
208
Reverse Forward
Forward
Torque
Torque
Speed Limit
Δn
Limit
Bias d5-05
Speed
0
Speed
Limit
Speed Limit
Torque
Bias d5-05
Limit
Torque
Torque
Δn
Δn
Limit
Speed
0
Speed
Limit
Torque
Limit
Winder
Speed Torque
Line Direction
M
Operating Conditions
Reverse Forward
Reverse
Torque
Torque
Limit
Speed Limit
Bias d5-05
Speed
Limit
Speed
0
Internal
Torque
Internal
Reference
Torque
Reference
Torque
Δn
Limit
Torque
Torque
Limit
Speed
Speed Limit
Limit
Bias d5-05
Speed
0
Internal
Torque
Reference
Δn
Torque
Δn
Limit
Torque
Speed Torque
M
YASKAWA ELECTRIC SIEP C710616 27G YASKAWA AC Drive A1000 Technical Manual
Table 5.20 explains the relation
Reverse Forward
Forward
Torque
Torque
Limit
Speed Limit
Bias d5-05
Speed
Speed Limit
Limit Bias
Speed
d5-05
0
Δn
Torque
Δn
d5-05
Limit
Torque
Torque
Limit
Speed Limit
Bias d5-05
Internal
Speed Limit
Torque
Reference
Speed
0
Internal
Torque
Reference
Δn
Torque
Δn
Limit
Unwinder
Speed Torque Speed
Line Direction
M
Reverse
Reverse
Torque
Δn
Δn
Internal
Torque
Reference
Speed
0
Speed
Limit Bias
Speed
d5-05
Limit
Torque
Limit
Torque
Δn
Δn
Speed
0
Speed
Limit Bias
Speed
d5-05
Limit
Torque
Limit
M Line Direction