Technical data

5. Switch off the main switch of the machine.
6. Secure the machine against accidental movements and against unau-
thorized operation.
7. Wait for the discharge time of the electrical systems to expire and then
disconnect all electrical connections.
8. Before dismantling, secure the motor and fan unit against falling or move-
ment before disconnecting the mechanical connections.
12.4 Maintenance
12.4.1 General
Synchronous motors of the IndraDyn S series operate mainenance-free within
the given operating conditions. However, operation under unfavorable condi-
tions can lead to limitations in availability.
● Increase availability with regular preventive maintenance measures. Heed
the information in the maintenance schedule of the machine manufacturer
and the service measures described below.
WARNING
Danger of burning via hot surfaces with temperatures over 100°C!
⇒ Touch the motor only after cooling! A cooling time up to 140 minutes can be
necessary! The stated thermical time constant in the technical data is a meas-
ure for the necessary cooling
⇒ Do not work on hot surfaces.
⇒ Use safety gloves.
WARNING
Danger of injury due to moving elements!
● Do not carry out any maintenance measures when the machine is running.
● During maintenance work, secure the system against restarting and un-
authorized use.
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. Clean the cooling fins
of the motors in regularly intervals (after one year at the latest) to reach a
sufficiently high heat emission surface. If the cooling ribs are dirty in part, suf-
ficient heat dissipation via the environmental air is not possible any longer.
An insufficient heat radiation may have undesired consequences. The bearing
lifetime is reduced by operation at impermissibly high temperatures (the bearing
grease is decomposing). Switchoff caused by overtemperature despite opera-
tion on the basis of selected data, because the appropriate cooling is missing.
12.4.3 Bearing
The nominal lifetime 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. 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 comes up
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and Controls
Rexroth IndraDyn S | Project Planning Manual
Commissioning, Operation and Maintenance