Operation; Maintenance - Mitsubishi Electric Super Helicross Series Instruction Manual

12. Operation

If a load is lifted up, do not release the brake using the manual brake release unit. The load may be dropped.
During inverter operation, be sure to observe the frequency range specified in the catalog. If the frequency is out of the specified range,
(1) Check the bolt tightening condition at each section.
the motor may be damaged.
Before turning on the switch
(2) Check the electric system.
Check that the foundation bolts, sprocket bolts, coupling bolts, etc. are tightened properly.
Check that the electric system is properly wired, and the terminal box cover is closed. Also check that the breaker capacity and over
current protective relay values are properly set.
Operation
(1) To operate the geared motor, observe the allowable loading torque range and the allowable starting frequency range,
(2) During operation, if the motor generates an abnormal noise, vibrates extremely, or shows abnormal characteristics, be sure to stop the
motor, and inspect or overhaul the motor.
(3) During operation, keep your body away from the geared motor. If you touch the geared motor during operation, you may be injured or get
burned.
Others
(1) At starting, apply a light load. When the motor speed is increased to the full speed, apply the specified load.
(2) To stop operation, be sure to turn off the power switch.
●Do not modify the geared motor.
●Be sure to turn off the power before inspecting or repairing the motor.

13. Maintenance

(1) Daily check
Check item
Current
Noise
Surface temperature
Vibration
Lubricant leak
Chain
(2) Periodical inspection
Periodically check the motor and replace the damaged parts while referring to the table below (the table show the standard values
determined for daily operation of 8 hours,300days/year):
Check item
* Grease replacement
* Oil seal replacement
Chain tension
Looseness of foundation bolts
* Bearing replacement
Motor coil insulation resistance
Gap adjustment
Brake lining
Brake
thickness
O-ring replacement
(For brake cover)
For the item marked with an asterisk "*", please contact our system service department.
Notes: Just after replacement of the brake lining, the braking torque may be less than the specified torque. In this case, fit the friction surfaces
of the brake by applying the brake several times with a light load.
(3) Others
When oil oozes from set field of motor, if it does not develop, it can be used as it is because there is no problem on a performance. When oil
poses a problem, use after wiping off oil. This oil is a grease ingredient applied to very small quantity at the time of the assembly in a factory.
Check method
Check that the actual current value is equal to the rated current value specified on the
Using ammeter
nameplate or less.
Directly check the noise with your ear using a noise detector bar. The motor should
Hearing
not generate any abnormal noise.
Obtain the motor frame surface temperature rise value by subtracting the ambient
Thermometer temperature value from the motor frame surface temperature value. The temperature
rise should be 55℃ to 65℃.
Check the vibration of the gear case and frame. The obtained vibration values should
Vibration meter
be 4.9m/s
Visual check Check that no grease or oil leaks from the geared motor.
Check that the chain is not extremely sagging or too tight. Also check that the chain
Visual check
moves smoothly.
Schedule
（ 4 years）
Replace the grease every 10,000 hours of operation or every 4 or 5 years,
whichever is earlier.
Every10000Hours
<Grease>
With Extreme Pressure manufactured by JX Nippon Oil & Energy Corporation
Every 8000Hours
If the grease leaks from the seal, replace the oil seal.
( 3 years)
Every 6 months If the chain is loose, readjust the tension.
Every 6 months If the foundation bolts are loose, retighten the bolts.
Every8000Hours
If the bearing generates an abnormal noise, replace the bearing.
(3 years)
Check the insulation resistance of the motor coil using a 500V megger. The
Every 6 months insulation resistance should be 1 MΩ, dry the coil at 90℃ or less in a drying
furnace.
Every 6 months Adjust the gap to the range specified in Table 3.
If the lining thickness is less than the limit thickness specified in Table 3,
Annually
replace the brake lining.
Every 8000Hours
Periodically check the O-ring. If the O-ring is damaged, replace the O-ring.
(3 years)
Description
2
or less.
0.1~0.4kW : NLGI NO.00 of Lithium Complex Grease
0.75~2.2kW : NLGI NO.000 of Urea Grease
－ 15 －
Description