•
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 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.
12
ACU
Spindle Applications 11/13
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