Eaton Rapid Link RAMO5, Manual

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2 Engineering
2.8 STO function
Rapid Link 5 · RAMO5 · RASP5 10/19 MN034004EN www.eaton.com
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2.8.9 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.
• All electrical connections must be checked:
The screw terminals must be properly tightened and the power cables
must not show any signs of heat damage.
2.8.10 “Safe stop” function
The purpose of the STO function is to prevent the drive from making the
motor produce a torque when there is no input signal at terminals 3 and 4.
This makes it possible to integrate the drive into a complete safety system
in which the “safe stop” function needs to be fully implemented.
The STO function eliminates the need to use electro-mechanical contactors
with self-monitoring auxiliary contacts in order to implement safety func-
tions.
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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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DANGER
The STO function cannot prevent an unexpected restart or an
automatic restart if the STO inputs receive a signal.
Accordingly, it must not be used to perform maintenance or
cleaning work on the machine.