Mitsubishi LE-40MTA-E, Instruction Manual

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• When fine adjustment of the gain is required, first set the integral time, then adjust the proportional gain
according to the following procedure.
• The dead zone gain and dead zone width are not required to be changed in normal cases. However,
adjust these values if it takes too long time to reach the target tension when starting the system, switch-
ing to a new reel, changing the tension settings.
• Select "MANUAL" on the "GAIN" screen within "GAIN" on the engineer screen.
Set the value to as large a value as possible as long as the follow-
up action is not too slow when changing the tension setting, or no
hunting occurs while nearing the minimum diameter.
(Guideline: A value smaller by approximately 20% than the value
at which hunting occurs.)
Not necessary to change in normal cases. If required to change, change
the dead zone gain first to obtain the optimum value. Then, reduce the
dead zone width to a smaller value.
[1] Integral time (Initial set value: 50%)
The integral time determines the time responsibility against the deviation between the target tension
value and the operating tension value.
When a small value is set, the controllability is improved but hunting easily occurs. When a large val-
ue is set, the control is stabilized but the responsibility at the time when the unit is activated, the new
axis is changed over, the tension set value is changed, etc. is deteriorated.
Set a large value with which the follow-up delay generated when the tension set value is changed is
acceptable and hunting does not occur with a value near the minimum diameter.
[2] AProportional gain (Initial set value: 50%)
The proportional gain corrects the output in proportion to the deviation between the target tension val-
ue and the operating tension value.
When a large value is set, the target tension is reached faster but hunting easily occurs.
Set a value with which overshoot slightly remains when the target tension is changed.
The dead zone gain and the dead zone width are not required to be set (so that they remain in the
initial setting) usually. However, if it takes considerable time to reach the target tension value when
the unit is activated, the new axis is changed over, the tension set value is changed, etc., adjust them
together with the integral time and the proportional gain.
[3] Dead zone width (Initial setting: 50%)
The dead zone width specifies the deviation generated when the proportional gain is changed over.
When a small value is set, the responsibility becomes faster but hunting easily occurs.
[4] Dead zone gain (Initial setting: 0%)
When the deviation is larger than the dead zone width, the dead zone gain set here is added to the
proportional gain to increase the gain.
When a large value is set, the time required until the deviation enters the dead zone range can be
made shorter. However, if the set value is to large, hunting easily occurs. Enter a value with which
appropriate responsibility can be obtained when combined with the dead zone width and the propor-
tional gain.
1. Manual gain adjustment
G I N S E L E C T A U T O / M A N U A L G A I N T U N I N G
A U T O : „ M A N U A L
A
Select "MANUAL"
T
M N U . G T U N E M A N U A L G A I N T U N I N G
„ P R O P . G A I N
→
# # # % : I N T G . T I M E
→
# # # % :
A
M N U . G T U N E M A N U A L G A I N T U N I N G
A D D G A I N
→
# # # % :
„
D E A D Z O N E
→
# # # %
A
X
W
Reduce this value if deviation
between the target tension and
the actual tension remains.