ABB ACS880-1604, Hardware Manual

Page: 60 / 222

60 Guidelines for planning electrical installation
Selecting the energy storage
WARNING! ABB is not responsible for the customer ‘s energy storage selection or
protection of the energy storage.
The customer must equip the DC/DC converter with a suitable energy storage system.
Parallel DC/DC converters can have a common energy storage:
•
Dimension the energy storage so that it withstands the required current cycles and the
stored energy is sufficient. Take the depth of discharge into account in energy storage
lifetime calculations.
•
The energy storage must withstand the current ripple of the converter. See Ratings on
page 148 .
•
The output voltage (energy storage voltage) is not allowed to exceed the DC/DC
converter DC bus voltage. Add sufficient voltage margin in the design to prevent this in
case of voltage dips or grid faults.
•
The recommended energy storage operating voltage is:
U
storage
= 150 V … 80% of U
DC
•
The DC voltage values of the drives are:
•
with diode supply units with modules (ACS880-304 +A003, ACS880-304 +A018):
•
with IGBT supply units with modules (ACS880-204) typically
•
with regenerative rectifier units with modules (ACS880-904):
•
where
•
We recommend to measure the energy storage voltage. If you use a super capacitor
as the energy storage, voltage measurement is obligatory. If the converter is equipped
with the optional BAMU voltage/current measurement unit, the converter measures its
output voltage (and thus also the energy storage voltage) automatically. You do not
need any additional measurement for the converter. If there is no BAMU, you must
arrange the voltage measurement separately, and send the measured value to the
converter control program, eg, via a fieldbus communication (if in use), or by some
other means. For more information, see section
Energy storage voltage measurement
and estimation and parameter description in ACS880 DC/DC converter control
program firmware manual (3AXD50000024671 [English]).
•
The energy storage must have a disconnecting device and contactor. See
Disconnection of energy storage at the storage end and Implementing load current
switch-off .
U
DC
= 1.35 × U
AC
U
DC
= 1.41 × U
AC
(can be changed with supply unit parameter group 123 DC
volt ref)
U
DC
= 1.35 × U
AC
U
DC
= Drive DC voltage (in the DC bus)
U
AC
= Drive input voltage (AC)