Mitsubishi Electric MELFA RH-3CRH Series, Инструкция по эксплуатации

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5-56 Maintenance and inspection procedures
5 Maintenance and Inspection
(2) Timing belt tension measurement
Rotate the timing pulley A to one direction while visually checking its position, and measure the belt tension
at every 90 degrees, four times in total. The average of the four measurements is used as the timing belt
tension value.
The timing belt must be pulled tight before the tension is measured. For this purpose, rotate the timing
pulley A 90 degrees before measurement. Measure the tension of the belt to be pulled by the movement of
the timing pulley A.
When the temperature of the robot arm is high, the timing belt tension is increased. To ensure reliability of
the measurement, take measurements at least 30 minutes after the robot stops its movement.
Low ambient temperature may make accurate measurements using a tension gauge impossible. In this
case, perform the automatic operation or jog operation at measuring target axis for a few minutes, then
measure the tension of the belt.
Fig.5-4:Timing belt tension measurement
The procedure is shown below.
1) Turn on the controller's power supply.
2) Rotate the timing pulley A to one direction in jog operation while visually checking its position, and
measure the belt tension at every 90 degrees, four times in total (for one turn of the timing pulley A).
The amount of movement of each axis when the timing pulley A is rotated 90 degrees are shown in
Page 58, "(5) Amount of movement of each axis during the timing belt tension measurement" .
3) Take an average of the four measurements to determine the timing belt tension value.
During inspection of the timing belt, check that the belt tension exceeds the replacement guideline
value in
Page 58, "(4) Timing belt tension" . When the belt tension value becomes less than the
guideline value, the belt must be replaced immediately.
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