Veichi AC90 Manual page 77

AC90 TENSION CONTROL FREQUENCY INVERTER MANUAL
1: Torque mode. Inverter takes the motor output torque as control objectives, and applies tension control needs
occasions. Under torque control, the inverter output frequency is determined by the set torque and load torque. If the
set torque is greater than the load torque, motor speed will increase; if the set torque is less than the load torque, motor
speed will decrease.
Torque control is effective only when set as vector control without PG or with PG.
While take motor torque as the control aim, the F7 group parameters are valid. Torque giving set by the parameter
[F7.00 to F7.03]. Under this mode, the frequency set channel is still valid, and used to limit the maximum speed of
motor. While set torque is greater than the load resistance torque, motor speed will rise to set frequency as set
acceleration time [F0.14], and limit at the set frequency value. Right acceleration time settings can effectively relieve
the impact to the stretch material while motor speed rises. However, while the load resistance torque is greater than the
set torque, the inverter make the motor quickly reduce the speed without the deceleration time impact; While the
resistive torque and setting torque in balance, the inverter will allow motor steady speed running. Right set frequency to
prevent the motor coaster phenomenon.
Run order
Giving torque
Load torque
Giving
frequency
Tension control what is torque control aimed at set giving tension, is one function of torque control. No need tension
sensor under this mode.
When the material tension is the control aim, the F7.00 is set to 7, then the the F9 parameter group is valid. The inverter
can automatically calculate the output torque of the motor via paramerters such as giving tension, roll diameter and
mechanical drive ratio, suitable for the occasion needs tension control. Roll diameter is important parameter which must
be gain under tension control. Roll diameter calculation method of the inverter includes the linear speed calculation, the
thickness calculation, and time calculation. It can also receive analog signals, communications number given to get the
current roll diameter. Detials see parameters [F9.11]. You can use a variety of given mode for tension settings. While
tension taper can be set to make it keeps tight-in-easy-out in the process of winding to ensure that rolling molding,
detailed parameters [F9.01 to F9.06].
Tension
Constant tension
Set
tension
Intial roll
diametor
Tension
Set
tension
Intial roll
diametor
Output torque
Output frequency Torque DEC time
ACC time
Relationship between torque and speed under
Finall roll
X
diametor
Intial roll
diametor
Current roll
diametor
X Finall roll
Tape
diametor
tension
Intial roll
diametor
Current roll
Diameter calculate
diametor begin time
Tension control under torque control mode
ON
Torque ACC time
DEC time
Roll
diameter
=
Diameter calculate
Time
begin time
Roll
diameter
=
Time
72
Function Parameter specifications
ACC time
Torque
Finall
Torque
Actual output
torque
Initial
Torque
Time
Intial roll
diametor
Torque
Finall
Torque
Actual output
Initial
torque
Torque
Intial roll
diametor
Time