Considering The Pelv Requirements At Sites Above 2000 M (6562 Ft) - ABB ACS850 Hardware Manual

with noise attenuating circuits (varistors, RC filters [AC] or diodes [DC]) in order to
minimize the electromagnetic emissions at switch-off. If not suppressed, the
disturbances may connect capacitively or inductively to other conductors in the
control cable and form a risk of malfunction in other parts of the system.
Install the protective component as close to the inductive load as possible, not at the
relay output.
Relay output
Relay output
Relay output

Considering the PELV requirements at sites above 2000 m (6562 ft)

The relay outputs of the drive do not fulfill the Protective Extra Low Voltage (PELV)
requirements at installation sites above 4000 meters (13123 feet) if used with a
voltage greater than 48 V. At installation sites between 2000 meters (6562 feet) and
4000 meters (13123 feet), PELV requirements are not fulfilled if one or two relay
outputs are used with a voltage greater than 48 V and the remaining relay output(s)
are used with a voltage lower than 48 V.
Varistor
230 VAC
RC filter
230 VAC
Diode
24 VDC
Planning the electrical installation
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