Unintended Operation - Mitsubishi LE-40MTA-E Instruction Manual

10.4 Unintended operation

Check the abnormality of the major components during trial operation and adjustment and during actual op-
eration using the following procedure.
Item Problem
When the POWER
Power switch is turned ON,
supply the POWER LED is
not lit.
On the display, the
tension value or the
unit of the tension
flashes.
When restarting after
stopping the mate-
rial, the tension read-
ing goes beyond the
scale from the begin-
Tension
ning.
display
and
The output increases
abnormal
while the machine
tension
halts.
After replacement of
the material, an
extremely high or low
tension is applied.
Fluctuating tension
control
Output cannot be
Actuator obtained in the man-
ual mode.
• Make sure the supply voltage between the terminals [PSL] and [PSN] is
100 to 240VAC (+10% to -15%), 50/60 Hz. If this value is not correct,
perform the correct wiring.
• The fuse may be melted by insertion of foreign objects or abnormal loads.
If simply replacing the fuse may not solve the problem. Contact our ser-
vice department.
• The tension signal from the tension detector is too high. The applied
load may exceed the rated load of the tension detector. Lower the ten-
sion set value.
• Check the rated load of the tension detector. If no problem is detected,
increase the full-scale tension value. (After changing the full-scale ten-
sion value, be sure to tune the zero point and the span.)
• Turn ON or OFF the [MC1] input signal depending on the run/stop status
of the machine . If the [MC1] input signal is kept at on status, restarting
operation may send out the maximum control output, and an extremely
high tension may be applied.
• When stopping the machine, if the turning-OFF timing of the [MC1] input
signal is delayed, the control output may be extremely increased, and
an extremely high tension may be applied at starting operation. To pre-
vent this problem, be sure to turn OFF the [MC1] input signal when
stopping the machine.
• The [MC1] input signal may not be turned OFF.
• While the machine is stopped, be sure to turn off the [MC1] input signal.
• Check that the output set for the OFF status of the [RUN] input signal is
optimum for the reel diameter of the replaced material.
• Reset the stall memory.
• Check whether similar fluctuations occurs during manual operation.
• Fluctiations during manual operatinon is generally caused by changes in
tension as a result of machine vibration ,mechanical loss,etc. In this
case please check the machine.
• If fluctuations do not occur during manual operation, this is generally
caused by high control gain set by the LE-40MTA-E tension controller.
In this case, please adjust the control gain factor refer to Sec. 7.5.
• Make sure that the OUTPUT ON/OFF switch is turned on.
• When 0 to 24 V output is obtained between the terminals [P] and [N] by
the manual torque setting, check the wiring to the powder clutch/brake.
When no abnormality is detected , the clutch/brake is defective or se
lected inappropriately.
• If the output voltage is not obtained in the no-load condition when the
power is changed from off to on ,the LE-40MTA-E is defective.
If the short-circuit protection function between the terminals [P] and [N]
is actuated, the unit becomes the normal condition when the wiring is
corrected and the power is turned on again.
~
• If 0 5V output is not obtained between the terminals[SA] and [SN] and
the terminals [NRO] and [AOC], remove the external load (1kΩ or more)
~
and check whether 0
~
• If 4 20mA output is not obtained between the terminals [EAP] and
[EAN] , remove the E/P regulator (470Ω or less),connect the ammeter
between the terminals [EAP] and [EAN] , then check whether 4
output is obtained.
• While the memory cassette is attached, the control output is not gener
ated.
44
Disposal
5V is obtained.
~
20mA