Individual Functions
6-
133
Rewinding Operation
In a rewinding operation, the line (speed) and torque generated by the motor are in the opposite directions. (In
this example, we’ll assume that the line speed is positive and the torque reference input is negative.) For the
rewinding operation, the speed limit is positive and the torque reference input is negative. If the motor turns
faster than the speed limit, a negative compensation value is output from the speed limiter circuit. If the motor
is rotating in reverse, a negative compensation value is output. If the speed is 0 or is below the speed limit, a 0
compensation value is output. In this way, the output from the speed limiter is used to maintain the motor
speed between 0 and the speed limit. When the sum of the torque reference and the torque compensation out-
put by the speed limiter is the same as the actual load, the motor will stop accelerating and run at a constant
speed.
Rotation Direction Limit Operation Selection (Valid Only for PRG: 102
in Open-loop
Vector 2 Control)
In applications where the machine is not rotated in the opposite direction to the sign of the speed limit (i.e., in
winding operation), use with d5-07 set to 1. If the sign of the calculated speed is the opposite to that of the
speed limit, a torque will be output to prevent the motor from accelerating in the opposite direction.
Torque Reference Adjustment
Consider the following information when adjusting the torque.
Torque Reference Delay Time: d5-02
The time constant of the primary filter in the torque reference section can be adjusted. This constant is used to
eliminate noise in the torque reference signal and adjust the responsiveness to the host controller. Increase the
setting if oscillation occurs during torque control.
Winding Operation
Rewinding Operation
Configuration
Normal Rotation
Direction
Forward
Reverse
Forward
Reverse
Torque Reference
Polarity (TREF)
Speed Limit
Polarity (SLIM)
Generated Torque
X
M
Line direction
Line direction
N
T
N
T
X
M
X
M
Line direction
Line
direction
X
M
N
T
N
T
Speed
SLIM
0
∆
N
(d5-05)
TREF
Torque
limit
Torque
N(%) =
TREF(%)
C5-01
Torque
limit
Speed
SLIM
0
Ǎ
N
TREF
(d5-05)
N(%) =
TREF(%)
C5-01
Torque
limit
Torque
limit
Torque
SLIM
0
∆
N
TREF
(d5-05)
TREF(%)
The lower value of
∆
N(%) =
or d5-05(%)
C5-01
Torque
limit
Torque
limit
Torque
Speed
SLIM
0
∆
N
TREF
(d5-05)
Torque
limit
Torque
limit
Torque
Speed
TREF(%)
The lower value of
∆
N(%) =
or d5-05(%)
C5-01