Periodical Inspection; Troubleshooting - Nidec RINDCODE NRX Series Instruction Manual

4

Periodical Inspection

4-1 Daily inspection
1.Check to ensure that the speed drive housing temperature is not extremely high during operation.
＊ A temperature of up to approximately 50ºC higher than the ambient temperature will not cause any problems.
2.Check to ensure that there are no abnormal rolling sounds with the bearings and/or friction
transmission parts.
3.Check to ensure that abnormal vibration is not being generated from the speed drive.
＊ If any of these abnormal events occur, stop operation immediately, disassemble and inspect the unit, or contact us.
4.Confirm that oil has been supplied at the specified level of the oil gauge (Check when the unit stops).
5.Check to ensure that the oil has not been contaminated. Check to ensure that oil gauge is
transparent enough.
6.Check to ensure that there is no oil leakage anywhere (for example, in oil seals on the input and
output shaft parts, O-rings, oil gauge, and/or the area around the oil filling and drain ports, etc.).
＊ If any oil leakage occurs, replace the necessary parts, or contact us.
5

Troubleshooting

Symptoms
The unit does not
rotate (drive)
When load is applied
The unit rotates
(drives)
The unit does not rotate (start)
When no load is applied
The unit rotates
(starts)
● Oil leakage occurs
Fuse has blown
Load is excessive
The mated machine and its connecting mechanism have malfunctioned
Temperature has
increased abnormally
(overheating)
Slipping occurs
The rotation speed
has been unstable
Slipping does not
occur
The unit may be running with the missing phase
(Three phases may be functioning as one phase)
Sound has changed
Abnormal sound
when changing the
is heard
speed
Sound has not
changed even when
changing the speed
The unit rotates
in the reverse direction
The rotation speed
has not increased
Sound has changed
when changing the
speed
Abnormal sound
is heard
Sound has not
changed even when
changing the speed
4-2 Periodical inspection
1.Check to ensure that there is no excessive overload.
2.Check to ensure that pulleys, sprockets, and speed drive mounting
bolts are not loose.
3.Check to ensure that there are no problems in the electrical system.
4. Inspect and maintain major parts.
* If abnormal sounds occur inside of the speed drive, stop operation immediately,
disassemble and inspect the unit, or contact us.
5.Check to ensure that the specified time of replacement for
lubricating oil has not passed.
* Check to ensure that oil level has not decreased, and that it's not dark in
color. Check the specified replacement interval.
Possible causes
Abnormal load may have been applied
Fuse capacity may be insufficient
Speed drive capacity may be insufficient
Pressure contact of the driving
surface may be defective
Pressure contact of the driving surface
may be excessive
Voltage may decrease
Load is excessive
High viscosity oil
The amount of oil may be excessive,
insufficient, or oil may be deteriorated
The connecting part with the mated
machine may be defective
High viscosity oil
Load is excessive
Pressure contact of the driving
surface may be defective
The driving surface may have been worn
Electric power may decrease
Load is excessive
Bearing on the output side may be damaged
The drive surface on the output side
may be damaged
Bearing on the input side may be damaged
The drive surface on the input
shaft side may be damaged
The motor key section may be damaged
The ring and cone may be disconnected
The ring and cone may have contact failure
Fuse may have blown
The switch may have contact failure
The stator coil may have been disconnected
The connecting wire may have been
disconnected
Bearing may be damaged
The connecting wire may have been
disconnected in one phase
Wiring connection may be incorrect
The switch may have contact failure
(Governor switch on the single phase)
The stator coil may have been
short-circuited in one phase
The rotor may come into contact with the stator Replace the bearing, or repair at a specialized factory
High viscosity oil
The driving surface may have been worn
Bearing on the output side may be damaged
The drive surface on the output side
may be damaged
Bearing on the input side may be damaged
The drive surface on the input shaft side
may be damaged
The motor key section may be damaged
O-ring may be defective
Oil seal may be defective
Mounting bolts may be loose
Lubricating oil may be excessive
Packing or bonding agent
may not have been fixed
The pressure-release rubber plug
may have been left
11
(approximately at least
every three months)
Remedies
After inspection, decrease load to the specified level
Replace with a fuse with the specified capacity
Check the model and type again
Inspect the pressure contact condition, and replace worn
parts, if necessary
After inspection, adjust or repair
Adjust the pressure contact condition
Consult the power company
After inspection, decrease load to the specified level
Replace with the specified or equivalent oil
Replace with the specified or equivalent oil
(in the specified amount)
After inspection, adjust or repair
Replace with the specified or equivalent oil
After inspection, decrease load to the specified level
Adjust the pressure contact condition
Replace the ring and cone with normal parts
Consult the power company
After inspection, decrease load to the specified level
Inspect electric wires, and/or consult the power company
Replace the bearing
Replace the ring and cone with normal parts
Replace the bearing
Replace the ring and cone with normal parts
Replace the key and shaft with normal parts
Reapir the unit
Adjust the shim
Adjust terminal contact, or replace the fuse
Adjust the contact part
Repair at a specialized factory
After inspecting the disconnected part, replace
Replace the bearing
Replace with a complete set
Replace two of three power leads
Adjust the contact part
Repair at a specialized factory
Replace with the specified or equivalent oil
Replace the driving part with a normal part
Replace the bearing
Replace the ring and cone with normal parts
Replace the bearing
Replace the ring and cone with normal parts
Replace the key and shaft with normal parts
Replace the deformed or cracked O-ring with a normal part
Replace the hardened or deformed oil seal with a normal part
Tighten the bolts properly
Adjust to the specified amount
Apply the bonding agent evenly Replace the packing
with a normal part
Remove the rubber plug