Siemens SIMOTICS-T 1FW68 Engineering Manual page 62

Mechanical properties
3.5 Service and inspection intervals
Indications that maintenance work is necessary
● Unusual sounds emitted by the machine
● Problems with positioning accuracy
● Higher current consumption
Test and replacement intervals of the cooling medium
The test and replacement intervals for the cooling medium should be agreed with the
manufacturers of the anti-corrosion agent and the cooling system.
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1FW68 radial segment motors
Configuration Manual, 04/2017, 6SN1197-0AE02-0BP1