Mitsubishi Electric GM-SHY, Instruction Manual

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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,
the motor may be damaged.
Before turning on the switch
(1)
Check the bolt tightening condition at each section.
Check that the foundation bolts, sprocket bolts, coupling bolts, etc. are tightened properly.
(2)
Check the electric system.
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.
13. Maintenance
●
Do not modify the geared motor.
●
Be sure to turn off the power before inspecting or repairing the motor.
(1) Daily check
Check item Check method Description
Current Using ammeter
Check that the actual current value is equal to the rated current value specified on the
nameplate or less.
Noise Hearing
Directly check the noise with your ear using a noise detector bar. The motor should
not generate any abnormal noise.
Surface temperature Thermometer
Obtain the motor frame surface temperature rise value by subtracting the ambient
temperature value from the motor frame surface temperature value. The temperature
rise should be 55
℃
to 65
℃
.
Vibration Vibration meter
Check the vibration of the gear case and frame. The obtained vibration values should
be 4.9m/s
2
or less.
Lubricant leak Visual check Check that no grease or oil leaks from the geared motor.
Chain Visual check
Check that the chain is not extremely sagging or too tight. Also check that the chain
moves smoothly.
(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 Schedule Description
* Grease replacement
Every10000Hours
（
4 years
）
Replace the grease every 10,000 hours of operation or every 4 or 5 years,
whichever is earlier.
<Grease> 0.1~0.4kW : NLGI NO.00 of Lithium Complex Grease
0.75~2.2kW : NLGI NO.000 of Urea Grease
With Extreme Pressure manufactured by JX Nippon Oil & Energy Corporation
* Oil seal replacement
Every 8000Hours
( 3 years)
If the grease leaks from the seal, replace the oil seal.
Chain tension Every 6 months If the chain is loose, readjust the tension.
Looseness of foundation bolts Every 6 months If the foundation bolts are loose, retighten the bolts.
* Bearing replacement
Every8000Hours
(3 years)
If the bearing generates an abnormal noise, replace the bearing.
Motor coil insulation resistance Every 6 months
Check the insulation resistance of the motor coil using a 500V megger. The
insulation resistance should be 1 MΩ, dry the coil at 90
℃
or less in a drying
furnace.
Brake
Gap adjustment Every 6 months Adjust the gap to the range specified in Table 3.
Brake lining
thickness
Annually
If the lining thickness is less than the limit thickness specified in Table 3,
replace the brake lining.
O-ring replacement
(For brake cover)
Every 8000Hours
(3 years)
Periodically check the O-ring. If the O-ring is damaged, replace the O-ring.
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.
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