YASKAWA A1000 Series Technical Manual page 190

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 b5-08 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
Torque Reference
Positive (Forward)
Direction
Speed Limit
Positive (Forward)
Direction
Normal Operation
Direction
Torque
Limit
Internal
Torque
Reference
Generated Torque
(d5-08 = 0)
<1>
Speed Limit
Bias d5-05
Torque
Limit
Internal
Torque
Generated Torque
Reference
(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-
Use this output to notify a PLC or some other control device of abnormal operating conditions.
Switching Between Torque and Speed Control
■
A digital output can be used to switch Torque Control and Speed Control (H1-
Control to Torque Control, the torque limit becomes the torque reference and the speed reference becomes the speed
limit. This change is reversed when switching back to Speed Control.
If required by the application, a delay time can be set up using parameter d5-06. The reference values (torque reference/
speed limit in Torque Control or speed reference/torque limit in Speed Control) are held during this switch delay time. Be
sure to change the reference values from the controller within this delay time.
Note: 1. The switching delay time d5-06 is not applied when the Stop command is entered. Here the operation switches immediately to speed
control and the drive decelerates to stop at the torque limit.
190
Forward
Forward
Torque
Torque
Δn Speed Limit
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
Forward
Negative (Reverse)
Negative (Reverse)
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 27C YASKAWA AC Drive A1000 Technical Manual
Table 5.20 explains the relation
Forward
Negative (Reverse)
Positive (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
.
= 71). When switching from Speed
Forward
Positive (Forward)
Negative (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
Limit d5-05
Torque
Limit
Line Direction
M
= 32).