Parameter Description
Parameters
190
• To enhance productivity, generally, the winding shaft will be switched without stopping the
machine (auto winding up and rolling down the material). To realize the smooth and
well-off auto roll alternation and avoid causing too large shock, it is necessary to rotate
the wind-up roll (roll-down roll) in advance and the rotating line speed shall be consistent
with the line speed of the materials in operation (
V1≈V2). This is the pre-drive function.
• Auto roll alternation control logic
On the occasion of continuous working, the auto roll alternation control logic is used to
alternate the roll smoothly to enhance productivity. The auto roll alternation function is
realized with the cooperation of the control signal provided by external controller.
Wherein, the motion of B, C and D is only active when the replacing lower roll inverter
works in the close loop vector control mode (P.300=4).
A. Pre-drive process
When the replacing upper roll inverter receives the pre-drive reference, no matter
what value P.600 is set, it will operate according to the matching frequency
calculated by the given line speed and the initial curling radius until the line speed
of replacing upper roll is consistent with the system line speed. When the pre-drive
signal disappears, the control mode switches to the setting tension control mode.
B. Torque memory signal
Before replacing the roll, the torque memory signal makes the replacing lower roll
inverter remember the current output torque for the use of later process.
C. Torque memory enable
When the replacing upper roll has contacted with the material and the replacing lower
roll hasn’t been replaced, no matter which torque control mode is adopted, the
replacing lower roll inverter will be switched to the torque control mode by the torque
memory enable signal. The given Torque reference is the torque remembered by the
previous inverter.
D. Torque increase function
When the torque memory enable signal is valid, the inverter will control the torque
according to the memory torque. After the setting torque increase delay time, the
output torque will increase according to the setting torque increase proportion to
keep a large line tension at the moment for easy cutting off.
At the end of roll alternation, the pre-drive signal of the replaced upper roll inverter is
revoked. Then the replaced upper roll inverter operates in the setting tension control
mode. The process of roll alternation is end after the replacing lower roll inverter
stops.
• The pre-drive reference, torque memory signal and torque memory enable signal
mentioned above in the point 3 are realized all by setting the corresponding function of
external terminals.
• P.645 is use to set the pre-drive speed gain. For meeting the technological requirements
and revising the line speed error, it can be adjusted on the basis of synchronous
matching frequency. The adjustment formula: V2 = V1 * (1 + P.645 ).
When P.645<0, the line speed of pre-drive roll will be lower than the material line speed.
