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Installation Supplement for ACS550-U2 Drives
Safety
General
In this manual, ACS550 refers, unless otherwise stated, to type ACS550-U2.
Warning! The ACS550 adjustable speed AC drive should ONLY be installed by
a qualified electrician.
Warning! Even when the motor is stopped, dangerous voltage is present at the
Power Circuit terminals U1, V1, W1 and U2, V2, W2 and UDC+, UDC-.
Warning! Even when power is removed from the input terminals of the
ACS550, there may be dangerous voltage (from external sources) on the
terminals of the relay outputs RO1...RO3 or on option modules.
Warning! Dangerous voltage is present when input power is connected. After
disconnecting the supply, wait at least 5 minutes (to let the intermediate circuit
capacitors discharge) before removing any covers.
Warning! The ACS550-U2 is field repairable by qualified personnel only. To
service or repair a malfunctioning unit, contact your local Authorized Service
Center.
Warning! The ACS550 will start up automatically after an input voltage
interruption if the external run command is on.
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
form a single source, which can either be one or the units, or an external
supply.
Warning! The heat sink may reach a high temperature. See Technical Data
chapter in User's Manual.
Use of Warnings and Notes
There are two types of safety instructions throughout this manual:
• Notes draw attention to a particular condition or fact, or give information on a
subject.
• Warnings caution you about conditions which can result in serious injury or death
and/or damage to the equipment. They also tell you how to avoid the danger. The
warning symbols are used as follows:
Dangerous voltage warning warns of high voltage which can cause physical injury
and/or damage to the equipment.
General warning warns about conditions, other than those caused by electricity,
which can result in physical injury and/or damage to the equipment.
3
Safety
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