Safety Information and Precautions
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Electrical Installation - Safety
Electrical shock risk is always present within an AC Drive including the output cable leading to the motor
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to live contact with the brake resistors, terminals which are at high DC voltage and potentially lethal. Cables
from the AC Drive to the dynamic brake resistors should be double insulated as DC voltages are typically 600
to 700 VDC.
Mains power supply isolation switch should be fitted to the AC Drive. The mains power supply must be
disconnected via the isolation switch before any cover of the AC Drive can be removed or before any
servicing work is undertaken stored charge in the DC bus capacitors of the PWM inverter is potentially lethal
after the AC supply has been disconnected. The AC supply must be isolated at least 10 minutes before any
work can be undertaken as the stored charge will have been discharged through the internal bleed resistor
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Whenever possible, it is good practice to check DC bus voltage with a VDC meter before accessing the
inverter bridge. Where the AC Drive input is connected to the mains supply with a plug and socket, then upon
disconnecting the plug and socket, be aware that the plug pins may be exposed and internally connected to
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in the DC bus capacitors to be dissipated by the bleed resistors before commencing work on the AC Drive.
Electrical Shock Hazard
Ensure the protective earthing conductor complies with technical standards and local safety regulations.
Because the leakage current exceeds 3.5 mA in all models, IEC 61800-5-1 states that either the power
supply must be automatically disconnected in case of discontinuity of the protective earthing conductor or
a protective earthing conductor with a cross-section of at least 10 mm
2
(Cu) or 16 mm
2
(Al) must be used.
Failure to comply may result in death or serious injury.
When using an earth leakage circuit breaker, use a residual current operated protective device (RCD) of
type B (breaker which can detect both AC and DC). Leakage current can cause unprotected components to
operate incorrectly. If this is a problem, lower the carrier frequency, replace the components in question with
parts protected against harmonic current, or increase the sensitivity amperage of the leakage breaker to at
least 200 mA per drive.
Factors in determining leakage current:
Size of the AC drive
AC drive carrier frequency
Motor cable type and length
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