ABB ACH550-01 User Manual page 20

Use of warnings and notes
There are two types of safety instructions throughout this
manual:
• Warnings caution you about conditions which can result in
serious injury and death and/or damage to the equipment.
They also tell you how to avoid the danger.
• Notes draw attention to a particular condition or fact, or give
information on a subject.
The warning symbols are used as follows:
Danger; electricity warns of high voltage which can
cause physical injury and/or damage to the equipment.
General danger warns about conditions, other than those
caused by electricity, which can result in physical injury
and/or damage to the equipment.
Safety instructions
WARNING! The ACH550 should ONLY be installed by a
qualified technician.
WARNING! Even when the motor is stopped, dangerous voltage
is present at the power circuit terminals U1, V1, W1 and U2, V2,
W2, and, depending on the frame size, UDC+/BRK+ and
UDC-/BRK-.
WARNING! Dangerous voltage is present when input power is
connected. After disconnecting the supply, wait at least 5
minutes before removing the cover. To check, measure for zero
voltage at the DC terminals, which are, depending on the frame
size, UDC+/BRK+ and UDC-/BRK-.
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
R01...R03 and, if the relay extension board is included in the
installation, R04...R06.
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ACH550 User's Manual
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