YASKAWA Varispeed G7 Series User Manual

Individual Functions
6- 135
Winding Operation
In a winding operation, the line (speed) and torque generated by the motor are in the same direction. For the
winding operation, both the speed limit and the torque reference input are positive. The motor will accelerate
when the torque reference input is larger than the load and will decelerate when it is smaller than the load. If
the motor turns faster than the speed limit, a negative compensation value is output from the speed limiter cir-
cuit. When the speed then drops below the speed limit, a positive compensation value is output. The torque
compensation is proportional to the ASR proportional gain. When the sum of the torque reference and the
torque compensation output by the speed limiter is the same as the actual load, the motor will stop accelerating
and run at a constant speed.
Unwinding Operation
In an unwinding 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 unwinding 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 compensa-
tion output 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.
Winding Operation Unwinding 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
NT NT
X
M
X
M
Line direction
Line
direction
X
M
NTNT
Speed
SLIM
0
ΔN
(d5-05)
TREF
Torque
limit
Torqu
e
N(%) =
TREF(%)
C5-01
Torque
limit
Speed
SLIM
0
ǍN
TREF
(d5-05)
N(%) =
TREF(%)
C5-01
Torque
limit
Torque
limit
Torqu
e
SLIM
0
ΔN
TREF
(d5-05)
TREF(%)
The lower value of ΔN(%) =
or d5-05(%)
C5-01
Torque
limit
Torque
limit
Torque
Speed
SLIM
0
ΔN
TREF
(d5-05)
Torque
limit
Torque
limit
Torque
Speed
TREF(%)
The lower value of ΔN(%) =
or d5-05(%)
C5-01
TOE-S616-60.1.book 135 ページ ２０１７年８月４日 金曜日 午後３時４１分

YASKAWA Varispeed G7 Series Specifications

General

Brand	YASKAWA
Model	Varispeed G7 Series
Category	Inverter
Language	English