ABB Buffer module CP-B 24/20.0 Data Sheet
Data sheet
Buffer module CP-B 24/20.0, ultra-capacitor based
Accessory for power supplies
(e.g. switch mode power supplies CP range)
The CP-B 24/20.0 serves to ensure a short-
term uninterrupted power supply system with a
voltage of 24 V DC by buffering the load in case of
power loss.
The buffer module features a new technology
of storing energy by using ultra-capacitors
which entirely obviate the need for maintenance
and exempt deep discharge in comparison to
batteries.
The energy storage can be expanded with
additional extension modules for longer buffering
times and is therefore utmost adaptable.
2CDC 271 003 S0010
Characteristics
– Buffer module for supporting the supply system
in case of mains failure
– Rated input voltage 24 V DC
– Rated output voltage 24 V DC
– Rated input current 20 A
– Rated output current 20 A
– Typical charging time < 135 s at 100 % load current
– Typical buffering time > 15 s at 100 % load current
– 2 relay contacts, normally open, ‘INPUT OK’ and ‘BUFFER STATUS’ status signal
– 1 relay contact, change-over, ‘FAILURE’ status signal
– 4 LEDs for indication of operational states
– 1 control signal input for specifical switch off, ‘SHUT-DOWN’
– Expandable with up to 2 extension modules CP-B EXT.2
– Maintenance free
– Temperature resistant
– No deep discharge
Order data
Buffer module
Type Rated input voltage Input voltage range Rated output voltage Rated output current Order code
CP-B 24/20.0 24 V DC 23.4-27.4 V DC 24 V DC 20 A 1SVR 427 060 R2000
Accessory
Type Rated voltage Voltage range Order code
CP-B EXT.2
24 V DC 0-26.4 V DC
1SVR 427 065 R0000
Functions
max. 20
nl
Operating controls and terminals
1
Signalling
SHUT-DOWN+, SHUT-DOWN-: Input signal terminals
INPUT OK, BUFFER STATUS, FAILURE:
Signalling contact – terminals
2
1
Input terminals
L+IN, L-IN, L-IN: Input voltage terminals
2
3
Indication of operational states
OPERATION: Buffer module in operation (standby or
3
buffering)
INPUT OK: Input voltage applied
2CDC 271 003 S0010
4
BUFFER STATUS, FAILURE: details see table ‘LEDs,
status information and fault messages’ on page 4
4
Output terminals
L+
, L-
, L-
OUT
OUT
EXT+, EXT-:
: Output voltage terminals
OUT
Connection terminals for extension module
Application
In most areas of energy management and automation technology power supply systems have to be highly reliable. Often
batteries are used for supporting the supply system in case of mains failures. Batteries have limited lifetimes depending on
environmental parameters and, therefore, have to be maintained regularly, which causes efforts and costs.
Using the latest ultra-capacitor technology, ABB offers an innovative and completely maintenance-free new product for
buffering the 24 V DC supply at 20 A in case of interrupted mains on the primary side of the power supply.
The CP-B 24/20.0 buffer module provides an ultra-capacitor buffered energy storage for power supply units. It ensures a
short-term uninterrupted power supply system. In case of power loss, the energy stored in the capacitors guarantees that
the load is continually provided, depending on the load current, up to several hundred seconds.
Additional extensibility
In order to ensure a longer uninterrupted power supply, the energy storage can be easily extended with up to 2 additional
extension modules.
Example of application
L+
L
-
IN
IN
EXT+
-
EXT
CP-B 24/20.0
L
-
L+
OUT
OUT
A
L+
-
L
load 1load
buffered
L
N
CP-C 24/20.0
L+
-
L
max. 20 A
EXT+
-
EXT
CP-B EXT.2
unbuffered
L+
-
L
...
...
oad 1load n
2CDC 273 010 F0210
2 - Buffer module CP-B 24/20.0, ultra-capacitor based | Data sheet
Operating mode
60
70
Temperature [°C]
Years
A power supply has to be connected to the buffer module‘s terminals L+IN and L-IN. Once the input voltage has been
applied, the buffer module starts loading its ultra-capacitors. Having achieved an energy level greater than 80 % of the
nominal capacitance, the LED ‘BUFFER STATUS’ glows. Regardless of the energy level, the buffer module provides the
according output voltage after having applied the minimum charging potential on the input side for about 2 s.
In case of interrupted mains on the primary side of the power supply the buffer module guarantees that the load connected
to terminals L+
OUT
and L-
is continually provided. In order to display the interrupted supply on the primary side the LED
OUT
‘INPUT OK‘ turns off while the capacitors are being discharged. When the energy level drops below 30 % of the nominal
capacitance, the LED ‘BUFFER STATUS’ turns off.
The LED ‘FAILURE’ indicates faults due to overvoltage at the internal capacitors as well as overcurrent at the output.
The messaging relays ‘INPUT OK’, ‘BUFFER OK’ and ‘FAILURE’ are coupled with the correspondent LED which glows
while the according relay is energized.
Important operating features
To trigger a safe shut-down of connected loads, a 24 V DC control signal can be applied to the terminals labelled
‘SHUT-DOWN+’ and ‘SHUT-DOWN-’. This effects that buffered loads can be switched off in a defined state. Furthermore
the shut-down can be used if a specific energy level of the capacitors has to be conserved.
Its advantage is that a subsequent charging of the capacitors can be shortened.
For applications where higher currents are needed for a short time (e.g. energization of contactors), the buffer module is
able to provide double of its rated output current for 1.5 s. To use this feature, completely charged capacitors are required.
Decommissioning
To put the buffer module out of operation, the power supply has to be turned off. Subsequently the buffer module continues
to supply the load until the capacitors are discharged.
In order to circumvent the subsequent buffering operation and the discharge of the capacitors, the module can be directly
switched off by activating the shut-down without buffering. All LEDs turn off immediately.
Functional interaction of power supply and buffer module in charging operation
The buffer module’s ultra-capacitors require a minimum charging potential, which has to be provided by the power supply.
The minimum charging potential is necessary to charge the capacitors or to preserve the energy level in case of fully loaded
capacitors. The charging process and the charging time of the buffer module depend on the input and the load current.
Having buffered and unbuffered loads connected to the power supply result in a split up of its provided current into parallel
divided circuits (see ’Example of application’ on page 2).
In order to use the maximum available current provided by the power supply, the buffer module acts as a variable load.
The module decreases its load, if the rated input current of the buffer module would cause the power supply to cut the
output voltage down (load limiting function) or to perform a slow lowering of the output voltage, resulting in an input voltage
lower than the specified minimum charging potential. In this way the buffer module ascertains the fastest possible charging
process according to the power supply used.
Note: It is highly recommended that loads which do not need an uninterrupted supply are connected directly, in parallel
to all buffered loads, with the power supply. Buffering such loads would only reduce the buffering time which is load
dependent. Therefore loads should be selected as small as necessary in order to achieve high buffering times.
Note: The capacitor’s life span depends on the temperature
exposed to as shown in the figure below as well as on the load
50
40
current. The end of the life span is reached, when its capacitance
drops below 70 % of its nominal capacitance. Using
the buffer
module continuously at its specified maximum applicable
temperature, the expected product lifetime is approximately 5 years.
30
20
10
0
Capacitor’s life span over temperature
302010
40 50
60
2CDC 272 031 F0210
Data sheet | Buffer module CP-B 24/20.0, ultra-capacitor based - 3
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