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10. Inspection and Maintenance
10.1 Initial inspection
1. Confirmation of selection
• Before starting operation, make sure that the tension detector, actuator, power-amplifier, servo ampli-
fier and E / P regulator are selected correctly.
• The P-N output of the tension controller LE-40MTB-E is designed as 24 VDC, 4 A or less.
The actuator capacity is selected based on the line speed multiplied by the operating tension.
A larger tension can be set in the LE-40MTB-E. However, in the case, the actuator may be burned out.
Make sure that the operator is instructed appropriately as to the allowable maximum operating tension.
• If the set tension is too small, the tension fluctuation become too large compared with the operation
tension when the unit is started or stopped, and operation may be difficult.
Make sure that the operator is instructed appropriately as to the allowable minimum operating tension
also. The guideline of the minimum operating tension is shown below.
2. Operation sequence
• Check the operation sequence and emergency stop sequence.
Especially when the servo motor is used as actuator, the motor may become out of order if the material
is cut.
Use the material cut detector and the zero tension detection output of the LE-40MTA-E together , and
set the speed limit input of the motor to 0 when the material is cut.
3. Wiring check
• Erroneous connection of the power terminal (Pay attention to the phase order in the motor system al-
so.), contact of the DC I/O cable with the power cable, and short-circuit of the output cable may cause
serious damage.
Before turning on the power, make sure that the power and ground are connected correctly and that
the I/O cable is wired correctly.
• Never perform the megger test (measurement of insulation resistance).
10.2 Maintenance
• Check periodically the following items:
The temperature inside the panel is not abnormally high due to heat generating substance or direct
sunlight.
Dusts and conductive dusts are not inserted into the panel.
Incorrect wiring, loose terminals and other abnormality are not detected.
• It is ideal to adjust the zero point and span in the tension detector again at each periodic inspection.
Especially when a tension detector used has a larger rated load compared with the actual tension, the
mechanical stress of the tension detector may contribute considerably to aging deterioration.
• The zero tension relay offers the service life of 500,000 ( five hundred thousands ) times against the
load of 35 VA or less. Accordingly, no problem will occur in the zero tension relay if it is not actuated
abnormally frequently.
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