12.4
Maintenance
12.4.1
General
Synchronous motors of the MK series operate without wear within the given
operating conditions. However, operation under unfavorable conditions can
lead to limitations in availability.
●
Increase availability with regular preventive maintenance measures. Ob‐
serve the instructions in the maintenance schedule of the machine man‐
ufacturer and the described service measures.
WARNING
Danger of injury due to moving elements! Danger of injury due to hot
surfaces!
⇒ Do not carry out any maintenance measures when the machine is running.
⇒ During maintenance work, secure the system against restarting and unau‐
thorized use.
⇒ Do not work on hot surfaces.
12.4.2
Cleaning
Excessive dirt, dust or shavings may affect the function of the motors adversely,
may in extreme cases even cause a failure of the motors. For that reason, you
should clean
Cooling ribs
●
the cooling ribs of the motors at regular intervals, in order to obtain a suf‐
ficiently large heat radiation surface. If the cooling ribs are dirty in part,
sufficient heat dissipation via the environmental air is not possible any
longer.
An insufficient heat radiation may have undesired consequences. The bearing
service life is reduced by operation at impermissibly high temperatures (the
bearing grease is decomposing). Switchoff caused by overtemperature despite
operation on the basis of selected data, because the appropriate cooling is
missing.
12.4.3
Bearings
The nominal lifetime of the bearings is L10h = 30,000 h according to
DIN ISO 281, ed. 1990, provided the permissible radial and axial forces are not
exceeded (
chapter 9.10.2 "Radial Load, Axial Load" on page 86
). Even if the
bearings are loaded with higher forces to a minor degree only, their service life
is affected negatively.
The motor bearings should be replaced if
●
the nominal bearing service life has been reached,
●
running noises occur.
We recommend that bearings be replaced by the Bosch Rexroth
Service.
12.4.4
Connection Cables
Check connection cables for damage at regular intervals and replace them, if
necessary.
Check any optionally present energy management chains (drag chains) for de‐
fects.
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and Controls
Rexroth MKE Synchronous Motors | Project Planning Manual
Startup, Operation and Maintenance
