16-2 Startup, Operation, and Maintenance Synchronous Motors MKD
19.05.2004 Version7.0 DOK-MOTOR*-MKD*******-PR07-EN-P
16.3 Maintenance
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
• the cooling ribs of the motors at regular intervals, in order to obtain a
sufficiently 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.
Bearings
The nominal service life of the bearings is L10h = 30.000 h according to
DIN ISO 281, ed. 1990, if the permissible radial and axial forces are not
exceeded (see Chapter 16.7). 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 noise can be heard.
Note: We recommend that bearings are replaced by the Rexroth
Indramat Service.
Connection Cable
Check connection lines for damage at regular intervals and replace
them, if necessary.
Check any optionally present energy management chains (drag chains)
for defects.
DANGER
Electrocution by live parts of more than 50 V!
⇒ Do not repair any connection lines provisionally. If
the slightest defects are detected in the cable
sheath, the system must be put out of operation
immediately. Then the cable must be replaced.
Check the protective conductor connection for proper state and tight
seat at regular intervals and replace it, if necessary.
Cooling ribs
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