Determining Preset B (Stop Point); Determining Preset A (Deceleration Count Setting); Automatic Reset; Electrical Control Adjustments - Web Techniques WT-25 Owner's Manual And Manual To Operations

Roll label rewind machines
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While it is possible for the counter to become unlocked
(possibly due to line noise, electrical storms, etc.), it is
important to note that this will disable the counter from
performing as it should. In order to correct the
situation, the counter will need to be re-programmed.
For your convenience, we have provided re-
programming instructions located in the final section of
this manual in the event that this occurs

DETERMINING PRESET B (STOP POINT)

The counter registers one count per ten inches of web
travel when using the standard ten-inch circumference
counter drive roll. This makes it easy to calculate the
appropriate number to enter into the counter in order
to wind a roll of a given number of labels. The number is
calculated as follows:
( ����. ���� �������������� ������������ ) (������������ ������������)
���������� =
EXAMPLE: To wind a roll of 1000 labels of 3 inch repeat
length, the number 300 would be entered as the final
count (Preset B).
( �������� ) (��)
���������� =
Figure 2 Counter Package
DETERMINING PRESET A (DECELERATION COUNT
SETTING)
The point at which deceleration should begin depends
on many factors (rewind speed, finished roll diameter,
etc.). Therefore you probably will need to test your de-
celeration count setting each time you rewind a new
type of label. The desired technique is to have the ma-
chine stop shortly after it decelerates fully and has sta-
bilized at the lower speed. For the first attempt try a
setting that is fifty counts less than the final count. This
����
= ������
����
means that the counter will begin to decelerate the
machine 50 counts before the end of the roll.
EXAMPLE: If the final count (Preset B) is 300, then the
deceleration count (Preset A) should be set at 250.

AUTOMATIC RESET

After winding a roll (and reaching the final preset num-
ber), the counter will reset to zero automatically when
the start pushbutton is pressed to start a new roll. This
is the only time automatic resetting can occur. Counting
will proceed normally each time the machine is stopped
and started (without resetting) until Preset B has been
reached. You may reset the counter to zero at any time
by pushing the "RST" button on the counter.
ELECTRICAL CONTROL
ADJUSTMENTS
The following list of settings has been pre-adjusted by
Web Techniques, Inc. to cover most applications. If
these settings are not optimal for your requirements,
adjustments may be made with discretion. These set-
tings are located on the printed circuit board closest to
the terminal blocks on the motor control. The motor
control is located inside the control cabinet.

MINIMUM SPEED

If a higher than zero minimum speed is desired, readjust
the minimum speed by turning the main speed control
knob on the front of the machine to zero setting (full
counterclockwise position). Then adjust the trim poten-
tiometer marked MIN to the desired setting.

DECELERATION RATE

If your labels become loose during the deceleration
period with the web tension set at the necessary level,
you should increase the deceleration rate by turning the
trim potentiometer marked DECEL clockwise. If you feel
that the deceleration period is too long, turn the decel-
eration trim potentiometer counterclockwise to reduce
the deceleration rate.

ACCELERATION RATE

Turning the trim potentiometer marked ACCEL clock-
wise increases the amount of time required for the mo-
tor to reach full speed. The setting should be such that
the web does not break when the motor is started.
5

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