Safety Information and Precautions
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Safety Information and Precautions
This guide is packaged together with the product for MD310 AC Drive� It contains basic information for quick start of the drive�
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Electrical Safety
Extreme care must be taken at all times when working with the AC Drive or within the area of the AC Drive� The voltages used in the AC
Drive can cause severe electrical shock or burns and is potentially lethal. Only authorized and qualied personnel should be allowed to
work on AC Drives�
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Machine/System Design and Safety of Personnel
Machine/system design, installation, commissioning startups and maintenance must be carried out by personnel who have the necessary
training and experience� They must read this safety information and the contents of this manual� If incorrectly installed, the AC Drive may
present a safety hazard�
The AC Drive uses high voltages and currents (including DC), carries a high level of stored electrical energy in the DC bus capacitors
even after power OFF� These high voltages are potentially lethal�
The AC Drive is NOT intended to be used for safety related applications/functions� The electronic “STOP &START” control circuits
within the AC Drive must not be relied upon for the safety of personnel� Such control circuits do not isolate mains power voltages from
the output of the AC Drive� The mains power supply must be disconnected by an electrical safety isolation device before accessing the
internal parts of the AC Drive�
Safety risk assessments of the machine or process system which uses an AC Drive must be undertaken by the user and or by their
systems integrator/designer� In particular the safety assessment/design must take into consideration the consequences of the AC
Drive failing or tripping out during normal operation and whether this leads to a safe stop position without damaging machine, adjacent
equipment and machine operators/users� This responsibility lies with the user or their machine/process system integrator�
The system integrator/designer must ensure the complete system is safe and designed according to the relevant safety standards�
Inovance Technology and Authorized Distributors can provide recommendations related to the AC drive to ensure long term safe
operation�
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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 terminals� Where dynamic brake
resistors are tted external to the AC Drive, care must be taken with regards 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 tted 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 tted
across the DC bus capacitors�
Whenever possible, it is good practice to check the 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 the DC bus capacitors (via the internal bridge rectier in reversed bias). Wait
10 minutes to allow stored charge in the DC bus capacitors to be dissipated by the bleed resistors before commencing work on the AC
Drive�
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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 across-section of at least 10 mm
2
(Cu) or 16
mm
2
(Al) must be used� Or use two PE wires and each wire must satisfy the IEC requirements independently� 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 100 mA per drive�
Factors in determining leakage current:
•
Size of the AC drive
•
AC drive carrier frequency
•
Motor cable type and length
•
EMI/RFI lter
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