MAINTENANCE Service Manual M4 - M10
24.01.2003 Page 20
6.2 Re-forming of DC bus electrolytic capacitors
6.2.1 Precautions and safety notices
Do not perform these instructions unless you are familiar with safety
regulations in electric and safe electrical workshop practices. Only a
competent, factory trained service technician is authorised to attempt to
service and repair works, where internal circuitry of the drive is subjected to
be under measures.
Note, that it is not possible for manufacturer to anticipate all of the ways or
conditions under which drive may be serviced or to provide cautions as to all
of the possible hazards that may result.
Always when you are attempting to service/repair measures, make sure that
unit at repair is not powered up, if not intended to be. Make sure there are no
remaining dangerous voltages in circuitry and there are no other voltage
sources for life threatening dangerous potentials.
Make sure environment you are working at is safe and won’t cause increased
risk for personal injury, damages for unit, or environment. Remember also to
follow local / national safety rules and regulation.
Internal components and circuit boards are at mains potential when the
frequency converter is connected to the mains. This voltage is extremely
dangerous and may cause death or severe injury if you come contact with it.
Terminals for the process control (I/O terminals) are normally potential free
and isolated from the main circuit but this must be always confirmed. Relay
outputs may carry high energies entering from the external control devices,
even if unit is unpowered.
When the unit is connected to the line, all power terminals are alive, including
output terminals even if the drive is not enabled by the start command.
Note, that drive has some amount of leakage capacitance from the main
circuit to ground due to protection capacitors for input rectifier and due to
parasitic capacitance.
To maintain safe construction, designed isolation, clearances, creepage
distances and especially correct operation of the complete drive, use only
spare parts delivered by Producer.
All rights reserved by Producer.
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