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2.4
Residual risks
Residual risks are special hazards involved in handling of the frequency inverter which cannot be elim-
inated despite the safety-compliant design of the device. Residual risks are not obviously identifiable
and can be a potential source of injury or a health hazard.
Typical residual hazards include:
Electrical hazard
Danger of contact with energized components due to a defect, opened covers or enclosures or im-
proper working on electrical equipment.
Danger of contact with energized components in frequency inverter if no external disconnection de-
vice was installed by the operator.
Electrostatic charging
Touching electronic components entails the risk of electrostatic discharges.
Thermal hazards
Risk of accidents by hot machine/plant surfaces, e.g. heat sink, transformer, fuse or sine filter.
Charged capacitors in DC link
The DC-link may have dangerous voltage levels even up to three minutes after shutdown.
Danger of equipment falling down/over, e.g. during transport
Center of gravity is not the middle of the electrical cabinet modules.
2.5
Safety and warning signs on frequency inverter
•
Comply with all safety instructions and danger information provided on the frequency inverter.
•
Safety information and warnings on the frequency inverter must not be removed.
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2.6
Warning information and symbols used in the Operating Instruc-
tions
2.6.1
Hazard classes
The following hazard identifications and symbols are used in the Operating Instructions to mark par-
ticularly important information:
DANGER
Identification of immediate threat holding a
high
risk of death or serious injury if not
avoided.
WARNING
Identification of immediate threat holding a
medium
risk of death or serious injury if
not avoided.
CAUTION
Identification of immediate threat holding a
low
risk of minor or moderate physical
injury if not avoided.
NOTE
Identification of a threat holding a risk of material damage if not avoided.
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