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54 Guidelines for planning electrical installation
Selecting the energy storage
WARNING!
ABB is not responsible for the energy storage selection or protection of the energy
storage.
The energy storage does not belong to the converter unit delivery. The customer (or the
system integrator) must equip the DC/DC converter with a suitable energy storage system.
The customer (or the system integrator) must also connect parallel modules (if any) to the
same energy storage. Additional guidelines:
•
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.
•
Make sure that the energy storage withstands the current ripple of the converter. See
the technical data.
•
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
= 150 V ... 80% of U
storage
•
Typical DC voltage values:
•
with diode supply units with modules (ACS880-304 +A003, ACS880-304 +A018):
U
= 1.35 × U
DC
•
with IGBT supply units with modules (ACS880-204):
U
= 1.41 × U
DC
ref.
•
where
U
= Drive DC voltage (in the DC bus)
DC
U
= Drive input voltage (AC)
AC
•
We recommend to measure the energy storage voltage. If the energy storage is a super
capacitor, voltage measurement is obligatory unless the capacitor withstands the
maximum DC voltage of the drive or contains internal overvoltage protection.
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.
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]).
•
Equip the energy storage with a circuit breaker capable of opening the circuit if there is
a failure in the energy storage or cable. See
the energy storage
DC
AC
(can be changed with supply unit parameter group 123 DC volt
AC
and
Energy storage disconnecting
Selecting the protective circuit breaker of
device.
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