ACS 400 User’s Manual iii
Safety
Warning! The ACS 400 should ONLY be installed by a qualified electrician.
Warning! Dangerous voltages are present when input power is connected. Wait at least 5
minutes after disconnecting the supply before removing the cover. Measure the
voltage at DC terminals (U
c+
, U
c-
) before servicing the unit. See Section E.
Warning! Even when the motor is stopped there are dangerous voltages present at Power
Circuit terminals U1, V1, W1 and U2, V2, W2 and U
c+
, U
c-
.
Warning! Even when power is removed from the input terminals of the ACS 400, there may
be dangerous external voltages at relay terminals RO1A, RO1B, RO1C, RO2A,
RO2B, RO2C.
Warning! The ACS 400 is not a field repairable unit. Never attempt to repair a
malfunctioning unit; contact the factory or your local Authorized Service Center for
replacement.
Warning! The ACS 400 can start up automatically after an input voltage interruption if
programmed for Automatic Restart after power outage.
Warning! When the control terminals of two or more ACS 100/140/400 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! The heat sink may reach a high temperature. See “Specifications” on page 21.
Note! For more technical information, contact the factory or your local ABB sales representative.
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