45
Check the system as per the following procedure if the zero/span adjustment would not complete.
Item Problem Disposal
Input signal
The contact signal
and the analog volt-
age signal are not
input properly.
• Compare the ON/OFF status of the input contact signal with the sta-
tus shown on the monitor screen. In addition, check the input contact
for poor contact. If the input signal is properly turned ON and OFF
but the ON/OFF status is not displayed on the monitor, the LE-
40MTA-E tension controller is defective.
• Compare the voltage of the analog input terminal with the voltage val-
ue displayed on the monitor. Also check that noise is not influencing
the input line.
Others
Material gets loose
during acceleration
or deceleration.
•
The material tends to get loose if the acceleration/deceleration time is
too short or the material inertia is too high. Use gain 1 or gain 2 to
compensate the inertia during acceleration and deceleration.
Material is displaced
or gets too tight dur-
ing winding.
•
The taper control is recommended.
Item Problem Disposal
Tension
detector
Zero adjustment is
not possible.
Check the wiring in
accordance with
page 5.
• If the voltage between the terminals [RED] and [BLK] is not approxi-
mately 5.0 VDC, remove the wiring of this terminal and measure
the voltage. If the specified voltage is not obtained, the LE-40MTA-
E is defective.
If the specified voltage is obtained, the external wiring or tension de-
tector is defective.
• Remove the wiring in the tension detector.
Short-circuit the terminals [WHR] and [GRR] as well as the terminals
[WHL] and [GRL] . If zero adjustment is not possible still, the LE-
40MTA-E is defective.
• Connect the terminals [RED] and [BLK] exclusively to the tension de-
tec tor. If the voltage between the white and green cables in the ten-
sion detec tor is 120 mVDC (150mV DC x 0.8)or less with which the
current is not applied in the material and zero adjustment is not pos-
sible, the LE- 40MTA-E is defective. If the measured voltage ex-
ceeds 120mV, the tension detector selected is not appropriate .
(The tare weight is 80% or more of the rated load.)
Span adjustment is
not possible.
Check the wiring in
accordance with
page 5.
• Perform zero adjustment at first. Connect the terminals [RED] and
[BLK] exclusively to the tension detector. Measure the voltage be
tween t he wh it e a nd gr ee n c ables in the ten si on de tecto r.
• When span adjustment is not possible even if the difference between
the voltage measured when the material tension is set to 0 and the
voltage measured when the material tension is set to full scale value
is 30mV (150mVDC x 0.2) or more, the LE-40MTA-E is defective .
• When the difference in voltage is less than 30mV, the tension load ap-
plied on the tension detector is insufficient and the tension detector
selected is not appropriate. Even if the span adjustment is normally
completed, the tension detection error increases.
Use a tension detector having a less rated load.
• If the load is changed while the span is adjusted, adjustment may be-
come disabled .
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