2.4 Safety Information and Warnings
DANGER
Hazardous Voltage!
● Always follow the proper lock-out/tag-out procedures before beginning any maintenance
or troubleshooting work on the VFD.
● Always follow standard safety precautions and local codes during installation of external
wiring. The installation must follow wiring practices and insulation systems as specified in
IEC 61800-5-1.
● Hazardous voltages may still exist within the VFD cabinets even when the disconnect
switch is open (off) and the supply power is shut off.
● Only qualified individuals should install, operate, troubleshoot, and maintain this VFD. A
qualified individual is "a person, who is familiar with the construction and operation of the
equipment and the hazards involved."
● Always work with one hand, wear electrical safety gloves, wear insulated electrical hazard
rated safety shoes, and safety goggles. Also, always work with another person present.
● Always use extreme caution when handling or measuring components that are inside the
enclosure. Be careful to prevent meter leads from shorting together or from touching other
terminals.
● Use only instrumentation (e.g., meters, oscilloscopes, etc.) intended for high voltage
measurements (that is, isolation is provided inside the instrument, not provided by isolating
the chassis ground of the instrument).
● Never assume that switching off the input disconnector will remove all voltage from internal
components. Voltage is still present on the terminals of the input disconnector. Also, there
may be voltages present that are applied from other external sources.
● Never touch anything within the VFD cabinets until verifying that it is neither thermally hot
nor electrically alive.
● Never remove safety shields (marked with a HIGH VOLTAGE sign) or attempt to measure
points beneath the shields.
● Never operate the VFD with cabinet doors open. The only exception is the control cabinet
which contains extra low voltages (ELV).
● Never connect any grounded (i.e., non-isolated) meters or oscilloscopes to the system.
● Never connect or disconnect any meters, wiring, or printed circuit boards while the VFD
is energized.
● Never defeat the instrument’s grounding.
● When a system is configured with VFD bypass switchgear (e.g. contactors between line
and motor, and VFD and motor), these switches should be interlocked so that the line
voltage is never applied to the VFD output if the medium input voltage is removed from
the VFD.
Safety Notes
2.4 Safety Information and Warnings
SINAMICS PERFECT HARMONY GH180 6SR41 manufactured in NMA Nuernberg, Germany
24 Operating Instructions Rev.201706301306
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