ABB RCNA-01 Bedienungsanleitung Seite 11

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Contents of this manual 7
ACH550-01 User's Manual
WARNING! Even when the power is switched off from the input
terminals of the ACH550, there may be dangerous voltage (from
external sources) on the terminals of the relay outputs
RO1…RO3 and, if the relay extension board is included in the
installation, RO4…RO6.
WARNING! When the control terminals of two or more drive
units are connected in parallel, the auxiliary voltage for these
control connections must be taken from a single source which
can either be one of the units or an external supply.
WARNING! Disconnect the EMC filter when installing the drive
on an IT system (an unearthed power system, a high-resistance-
earthed [over 30 ohms] power system or a power system
equipped with residual current circuit breakers), otherwise the
system will be connected to earth potential through the EMC
filter capacitors. This may cause danger or damage the drive.
Disconnect the EMC filter when installing the drive on a corner-
earthed TN system, otherwise the drive will be damaged.
Note: When the EMC filter is disconnected, the drive is not EMC
compatible.
For disconnecting the EMC filter, see Disconnecting the internal
EMC filter on page 45.
WARNING! The ACH550 is not a field repairable unit. Never
attempt to repair a malfunctioning unit; contact the factory or
your local Authorized Service Centre for replacement.
WARNING! The ACH550 will start up automatically after an
input voltage interruption if the external run command is on.
WARNING! The heat sink may reach a high temperature. See
chapter Technical data.
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