Cleaning - Mitsubishi LE-30CTN Instruction Manual

11. Inspection and Maintenance
Item
Tuning of the zero point is
not possible.
Tuning of the span is not
possible.
Changing a set item or
set value is not possible.
11.5

Cleaning

If the LE-30CTN becomes dirty, wipe it with dry cloth.
48
Problem
• Check that the voltage is approximately 5 VDC between the terminals
[RED] and [BLK]. If no voltage is output, disconnect the wire, and check the
voltage. No voltage is output after disconnecting the wire, the LE-30CTN
tension controller is defective. If voltage is output after disconnecting the
wire, the external wiring or the tension detector is defective.
• Disconnect the cable of the tension detector, and then short the lines
between the [WHR] and [GRR] terminals and between the [WHL] and [GRL]
terminals. In this condition, if zero point adjustment is not possible, the LE-
30CTN is defective.
• Without threading the material through the machine, check the voltage
between the white and green lines of the tension detector. If the voltage
obtained is out of the 120 mV DC range, the selected tension detector is not
appropriate (the tare weight is 80% or more of the rated value). In this case,
check the mass of the detector roller, and if necessary, reduce the mass of
the detector roller, or replace the tension detector with the optimum
detector. If the above voltage is in the range of 120 mV DC, but zero point
adjustment is not possible, the LE-30CTN tension controller is defective.
• Perform zero tuning at first. Measure the voltage between [WHR] and
[GRR] terminals and between [WHL] and [GRL] terminals.
• When span tuning 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 or more, the LE-
30CTN is defective.
• When the difference in voltage is less than 30mV, the tension load applied
on the tension detector is insufficient and the tension detector selected is
not appropriate. Even if the span tuning 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 become
disabled.
• When the run/stop signal [RUN] is on, some items cannot be change the
setting, and items can be change the setting in the adjustment mode only.
• Refer to Notes [2] and [3] in Sec. 12.3.
Disposal
11.5 Cleaning