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Functional safety components
The mission time of functional safety components is 20 years which equals the
time during which failure rates of electronic components remain constant. This
applies to the components of the standard Safe torque off circuit as well as any
modules, relays and, typically, any other components that are part of functional
safety circuits.
The expiry of mission time terminates the certification and SIL/PL classification
of the safety function. The following options exist:
•
Renewal of the whole drive and all optional functional safety module(s) and
components.
•
Renewal of the components in the safety function circuit. In practice, this is
economical only with larger drives that have replaceable circuit boards and
other components such as relays.
Note that some of the components may already have been renewed earlier,
restarting their mission time. The remaining mission time of the whole circuit is
however determined by its oldest component.
Contact your local ABB service representative for more information.
Cleaning the heatsink
The drive module heatsink fins pick up dust from the cooling air. The drive runs
into overtemperature warnings and faults if the heatsink is not clean. When
necessary, clean the heatsink as follows.
WARNING!
Use the required personal protective equipment. Wear protective gloves and
long sleeves. Some parts have sharp edges.
WARNING!
Use a vacuum cleaner with antistatic hose and nozzle, and wear a grounding
wristband. Using a normal vacuum cleaner creates static discharges which
can damage circuit boards.
1.
Stop the drive and do the steps in section
precautions (page 16)
2. Remove the module cooling fan(s). See the separate instructions.
3. Blow dry, clean and oil-free compressed air from bottom to top and
simultaneously use a vacuum cleaner at the air outlet to trap the dust. If there
is a risk of dust entering adjoining equipment, do the cleaning in another room.
4. Reinstall the cooling fan.
before you start the work.
Electrical safety
Maintenance 87
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