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Selecting the protective circuit breaker of the energy storage
￭
WARNING!
ABB is not responsible for the energy storage selection or protection of the energy
storage.
The customer (or the system integrator) must equip the energy storage with a protective
circuit breaker. The energy storage protective circuit breaker does not belong to the drive
delivery.
The breaker must be able to switch the load current on and off. The breaker must also
provide the overload and short-circuit protection for the energy storage. If there is no other
protection devices for the cables at the energy storage end, the breaker must also provide
the overload and short-circuit protection for the cable(s).
The customer (or the system integrator) must verify the operation of the circuit breaker by
short circuit calculations taking into account impedances of the drive, filter, if any), cabling
and energy storage, and minimum and maximum state of charge of the energy storage.
The customer (or the system integrator) must take into account the impact of ageing to
storage impedances.
Energy storage disconnecting device
￭
The customer (or the system integrator) must equip the energy storage with an disconnecting
device. The disconnecting device does not belong to the drive delivery.
Protecting the energy storage cable
￭
ABB equips the DC feeder unit with fuses as standard. The fuses protect the unit and cables
in a cable short-circuit situation.
The customer (or the system integrator) must equip the energy storage with overload and
short circuit protection for the cable.
Energy storage discharging device
￭
When necessary, the customer (or the system integrator) must equip the energy storage
with a discharging device. If the energy storage is a super capacitor, ABB recommends to
have it.
Implementing an interlocking for the DC
switch/disconnector
Unit equipped with DC switch/disconnector ([Q11], option F290): Implement a supply which
activates the interlocking of the DC switch disconnector when the energy storage is connected
to the drive. Interlocking is active when the supply is de-energised and inactive when
energized. Interlocking prevents the closing (but not the opening) of the DC
switch/disconnector under load. The user must not close or open the DC switch/disconnector
under load as this can cause damage.
Specification: 24 V / 7W. For the connection terminals, see the connection diagrams.
WARNING! Do not operate (close or open) the DC switch/disconnector (Q11)
under load. It can damage the switch.
Guidelines for planning the electrical installation 25
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