Use Of Warnings And Notes - ABB ACH550 Installation, Operation And Maintenance Manual

2
Safety

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:
Electricity warning warns of hazards
from electricity which can cause
physical injury and/or damage to the
equipment.
• WARNING! The ACH550 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 (L1, L2,
L3) and U2, V2, W2 (T1, T2 T3) and,
depending on the frame size, UDC+ and
UDC-, or BRK+ and BRK-.
• 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 the
cover.
• WARNING! Even when 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.
• WARNING! When the control terminals of
two or more drives 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 drives
or an external supply.
• WARNING! Disconnect the internal EMC
filter when installing the drive on an IT
system (an ungrounded power system or a
Safety
ACH550 Installation, Operation and Maintenance Manual
high-resistance-grounded [over 30 ohm]
power system).
• WARNING! Do not attempt to install or
remove EM1, EM3, F1 or F2 screws while
power is applied to the drive's input
terminals.
General warning warns about
conditions, other than those caused
by electricity, which can result in
physical injury and/or damage to the
equipment.
• WARNING! Do not control the motor with
the disconnecting device (disconnecting
means); instead, use the control panel keys
or commands via the I/O board of the drive.
The maximum allowed number of charging
cycles of the DC capacitors (i.e. power-ups
by applying power) is five in ten minutes.
• WARNING! Never attempt to repair a
malfunctioning ACH550; contact the factory
or your local Authorized Service Center for
repair or 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.
Note: For more technical information, contact
the factory or your local ABB representative.