2 Engineering
2.8 Safe Torque Off (STO)
Rapid Link 5 · RAMO5 · RASP5 05/20 MN034004EN www.eaton.com 59
2.8.10 Regular maintenance
During the corresponding inspection and testing, the variable frequency
drive’s installation and operating environment must be checked:
• The ambient temperature must fall within the admissible range.
• The heat sink and fan must be free of dust and other foreign particles.
The fan must be able to rotate freely.
• The enclosure in which the variable frequency drive is installed must be
free of dust and condensation.
• The enclosure fan and air filter must provide the required airflow.
• Check all electrical connections:
The screw terminals must be properly tightened and the power cables
must not show any signs of heat damage.
DANGER
The STO function should always be included in a scheduled
maintenance process (at least every three months) so that the
function will be tested on a regular basis to make sure it is intact
and complete - especially after changes are made to the safety
system and after repairs are made.
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