ABB ACH550-UH-011A-6 User Manual page 14

ACH550-01 User's Manual
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
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! If you install the drive on an IT system (an
ungrounded power system or a high-resistance-grounded [over
30 ohms] power system) or a power system equipped with
residual current circuit breakers), disconnect the internal EMC
filter, otherwise the system will be connected to ground potential
through the EMC filter capacitors. This can cause danger or
damage the drive.
If you install the drive on a corner-grounded TN system,
disconnect the internal EMC filter, otherwise the system will be
connected to ground potential through the EMC filter capacitors.
This will damage the drive.
Note: Disconnecting the internal EMC filter increases the
conducted emission and reduces the drive EMC compatibility
considerably.
Contents of this manual
Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com
9