Tension control parameter group 14
PARAMETER DESCRIPTION 267
3.
Torque memory enable
When the upper roll to be changed has contacted with the material and the lower roll hasn`t been changed,no
matter which torque control mode is selected,the lower roll inverter will be switched to torque control mode by
the torque memory signal.The given torque command is the torque memorized by the previous inverter
memory.
4.
Torque increase function
When torque memory signal is enabled,the inverter will control the torque according to the memorized
torque.Through setting the torque increase delay time,the output torque will increase according to the the set
torque increase proportion to keep a larger tension at the moment for easy cut off.
When roll change is finished, the pre-drive signal of the replaced upper roll`s inverter will be revoked.The
replaced roll`s inverter operates in tension control mode.The process of roll change is ended after the lower
roll inverter stops
Pre-drive command, torque memory signal and torque memory enable signal mentioned aboved achieved by
setting the corresponding function of digital input terminals.
14-41
(P.645)
is used to set the pre-drive speed gain.In order to meeting the technological requirements and fixing
the linear speed error,the synchronous matching frequency can be adjusted.The formula is:
V2 = V1 * (1 + 14-41
(P.645)
).
When 14-41
(P.645)
< 0, the linear speed of the pre-drive roll will be lower than the material linear speed
During the auto roll change process, when the torque memory enable signal is valid,the lower roll inverter will first
control the torque according to the memorized torque.After the delay time set by 14-43
(P.647)
,the output torque will
be increased according to the torque increase proportion set by 14-42
(P.646)
.
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