Mitsubishi LE-40MTA-E Instruction Manual page 49

Item Problem
The contact signal
and the analog volt-
Input signal
age signal are not
input properly.
Material gets loose
during acceleration
or deceleration.
Others
Material is displaced
or gets too tight dur-
ing winding.
Check the system as per the following procedure if the zero/span adjustment would not complete.
Item Problem
Zero adjustment is
not possible.
Check the wiring in
accordance with
page 5.
Tension
detector
Span adjustment is
not possible.
Check the wiring in
accordance with
page 5.
• 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.
• 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.
• The taper control is recommended.
• 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.)
• Perform zero adjustment at first. Connect the terminals [RED] and
[BLK] exclusively to the tension detector. Measure the voltage be
tween the white and green cables in the tension detector.
• 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 .
45
Disposal
Disposal