Application Note

Application Note
The Power of Reliability
Application Note
ICT DIGITAL SERIES POWER SUPPLIES
Battery Backup and Parallel Operation
OVERVIEW
The new ICT Digital Series is a high-current, high-efficiency DC power supply for
wireless communications, broadband, industrial power, transportation, process control
and DC in-building applications. It provides 1350 watts of output power in 12, 24 or
48 volts DC, and features a space saving 1RU design with 90 to 93% percent
efficiency. The isolated design allows operation in positive or negative ground
installations. Power factor correction helps further reduce power consumption. The
Intelligent Power Control interface on the front panel displays system status, and
allows the output voltage, current limit settings and the LVD disconnect and reconnect
voltage set points to be adjusted quickly and accurately. The interface can be
password protected.
The battery backup option is designed and rated to be used in a single
power supply application. A ‘B’ version Digital Series should not be
paralleled with one or more additional power supplies, otherwise damage
may occur due to the potential for too much current to flow through the LVD
relay (see Diagram 2).
TCP/IP Ethernet is available for remote monitoring and control of the power supply, and
an available Battery Backup function provides float charging and automatic revert with
an adjustable low-voltage disconnect. With the TCP/IP option installed, the power
supply can be remotely monitored and controlled using a standard web browser. ICT
Smart Parallel Operation allows up to six Digital Series power supplies to provide up to
8000 watts of output power.
A Digital Series power supply using the battery backup option should not
be connected in parallel to two or more additional power supplies. This
could result in damage due to too much current flowing through the LVD of
the power supply with the BAT terminal.
TECHNICAL NOTE
Battery current through the BAT terminal on power supplies with the battery
backup option must not exceed the maximum current limit rating of the
Digital Series power supply. Always use a suitably rated over current
protection device and disconnect in line with the BAT terminal.
Diagram 2
+
BATTERY BACKUP/LVD FUNCTION
-
DC LOAD
TCP/IP
The Digital Series Battery Backup option (models with ‘B’ designation) is intended for
use in a single power supply installation, where the load is connected to the main
output bus bars of the power supply, and a battery is
connected to the positive BAT output terminal of the
power supply (see diagram 1 and 1A for negative and
positive ground examples).
BAT
+
-
+
-
Diagram 1A - Positive Ground Sites
ICT Digital Series With Battery Backup/LVD Option powers DC loads,
provides float charging of battery, automatic revert when AC fails, and
LVD to protect battery from over discharging in negative ground sites.
ICT Digital Series With Battery Backup/LVD Option can be used in positive
ground sites. Refer to Technical Note and Owner’s Manual for important
installation information.
+
+
-
DC LOAD
BATTERY
Warning:
Never connect the BAT terminal of the power supply to the negative output of a battery.
The BAT terminal is connected internally through the LVD relay to the positive terminal of
the power supply. Damage may result. Always connect the battery + terminal to the BAT
(+) connector of the power supply.
To Load
+
-
BAT
ICT DIGITAL SERIES DC POWER SUPPLY
+
-
BATTERY
Page 1
ICT DIGITAL SERIES DC POWER SUPPLY
+
ICT DIGITAL SERIES DC POWER SUPPLY
AC Input
+
-
BATTERY
TCP/IP
TCP/IP
BAT
+
-
-
DC LOAD
AC Input
-
+
BAT
Diagram 1 - Negative Ground Sites
ICT DIGITAL SERIES DC POWER SUPPLY
AC Input
The BAT terminal provides a current limited charge up to the maximum rated output of
the supply. When AC fails, the load is automatically and seamlessly transferred to the
battery so that the load is not interrupted. When AC returns, the power supply picks up
the load, and resumes charging the battery to an optimal state of charge. A built-in
low voltage disconnect (LVD) protects the battery voltage from dropping too low,
thereby avoiding damage to the battery. The voltage disconnect and reconnect set
points can be adjusted by the user.
The intelligent battery backup option has been designed so that once AC power is
restored, the constant voltage, constant current output of the Digital Series will
simultaneously charge the battery and supply the load, thereby maintaining uptime
while restoring the battery to its optimum state of charge as quickly as possible.
ICT DIGITAL SERIES DC POWER SUPPLY
AC Input
-
+
BATTERY
TECHNICAL NOTE:
When using the LVD in a positive ground system (Diagram 1A), do not ground the positive terminal of
the battery. System must only have a single ground connection, normally located at the power
distribution or load point. An additional ground connection at the battery will allow current to bypass
the LVD contactor, preventing the disconnection of the battery during a low voltage event.
Innovative Circuit Technology Ltd.
Application Note 109
26921 Gloucester Way, Langley, BC, Canada V4W 3Y3
Tel: 604-856-6303 | Fax: 604-856-6365 | Email: sales@ictcorporate.com | www.ict-power.com
The Power of Reliability
Application Note
DIGITAL SERIES FOR CHARGING
For installers who want the high-availability benefits of connecting their loads directly to the battery, the ICT Digital Series power supply makes an ideal dedicated
charging system (see Diagram 3). The battery and DC load can be directly connected to the main output terminals of the power supply.
Since the ICT Digital Series features a fully isolated design, it can be installed in either positive ground or negative ground configurations (see Diagram 3A and 3B).
Diagram 3A - Negative Ground Systems
+
Diagram 3B - Positive Ground Systems
+
-
DC LOAD
-
DC LOAD
TCP/IP
TCP/IP
+
+
-
-
ICT DIGITAL SERIES DC POWER SUPPLY
ICT DIGITAL SERIES DC POWER SUPPLY
AC Input
AC Input
-
+
-
+
BATTERY
BATTERY
PARALLEL OPERATION - Creating a Scalable DC Power System
The ICT Digital Series power supply can be connected in parallel, up to a maximum of six units, to create a
scalable high power system capable of producing 8000 watts of output power for running DC loads directly,
or for high current battery charging (see diagram 4).
Diagram 4
Up to six Digital Series DC power supplies can be connected in
parallel to the load and the battery for constant charging. In this
configuration a standalone LVD can be used provided it is
appropriately rated for the current.
+
-
DC LOAD
TCP/IP
LVD
+
-
+
-
ICT DIGITAL SERIES DC POWER SUPPLY
ICT DIGITAL SERIES DC POWER SUPPLY
AC Input
+
BATTERY
MASTER/SLAVE
The Digital Series utilizes
Smart Parallel operation.
When equipped with the
TCP/IP Ethernet option, each
Digital Series is connected
with a jumper cable, and load
balancing
is
completely
automatic and optimized.
Additionally, the user can
select one Digital Series
power supply to be the Master, which then
monitors and controls all remaining power
supplies in the stack. Features such as
output voltage adjust and current limit
setting can be done from the Master,
which in turn will adjust all remaining
Slave units.
The TCP/IP Ethernet connection allows the
LAN port of the Master unit to
communicate with the entire power
system, and remote monitoring and control
of the entire stack is achieved quickly and
easily.
WARNING:
Units connected in parallel should not use the Battery Backup/LVD option, as there is a risk that the potential current could be higher than the rating of the low voltage disconnect relay,
causing potential damage. Users wishing to use paralleled Digital Series power supplies should use an external LVD that is appropriately rated for the total current load of the system
(see Diagram 4).
Page 2
Innovative Circuit Technology Ltd.
26921 Gloucester Way, Langley, BC, Canada V4W 3Y3
Tel: 604-856-6303 | Fax: 604-856-6365 | Email: sales@ictcorporate.com | www.ict-power.com
Application Note 109
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