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 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 inside of the frequency inverter if no external discon-
nection device was installed by the operator.
Electrostatic charging
Touching electronic components bears 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 electric cabinet modules.
2.5 Safety and warning signs at 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.
04/13 CM-CAN ACU 13
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