INNOVATIVE CIRCUIT TECHNOLOGY ICT24012-20CM Instruction Manual

ICT CM SERIES POWER SUPPLY
The CM Series off-line power supplies from ICT provide a
reliable 275 Watts of dc power with a built-in battery back-up
port and low current float charger for powering 12, 24 or 48Vdc
based systems. With an efficient wide range power factor
corrected input the units are useable world-wide, and their built
in flange mounting points and terminal block connections make
installation simple. Temperature controlled fan cooling ensures
long life operation over a wide range of ambient temperatures.
CONNECTION DIAGRAM
AC Input
(100-264Vac)
Ground
Neutral
Line
6-32 Threaded mounting
inserts (4)
WARNINGS
Risk of personal injury or damage to equipment and
property! Always observe the following:

Install and operate unit in a Restricted Access location,
such as an enclosed equipment rack

Operate the supply from a grounded 3-pin 120Vac or
230Vac outlet (50 or 60Hz) with a branch circuit breaker
rated 20A or less

Use an appropriate dc over-current protection device in
line with the optional battery connection

Use wire and connectors rated for the maximum load
current and size of battery fuse or circuit breaker

Ensure battery polarity is correct before connecting

Ensure required load current does not exceed max rating
of unit

Do not replace input fuse F1. Failure of this fuse indicates
the unit should be sent for factory service
INSTALLATION
Mount the unit on a horizontal flat surface in a restricted access
environment such as an equipment rack or cabinet, (ensuring
air vents are not blocked) using four 6-32 mounting screws (not
supplied). Make the following connections using wire and
connectors appropriately rated for the maximum input and
output current rating of the unit:

Connect the supply POS output terminal to the load
positive input

Connect the supply RTN output terminal to the load
negative input terminal

Connect an optional external battery if dc back-up
capability is desired
o
Choose a lead-acid battery with a float voltage rating
that matches the Panel Mount Series output voltage,
and has a 10 Amp-hour (Ahr) capacity rating or
greater. Larger capacity batteries will provide a longer
back up time in the event of an AC power failure
o
Connect the battery negative to the supply RTN
battery terminal
DC Output
o
Connect the battery positive to an over current
protection device (fuse or breaker)
+ Load
o
With the battery fuse removed or breaker open
RTN
connect the fuse or breaker to the supply BAT(+)
RTN
terminal
+ Battery
o
Either the POS or NEG lead may be connected to
earth ground if required by the application, as the
supply output is isolated from the chassis and ground.

Connect a de-energized AC power cord to the AC input
terminals of the supply, then plug into a grounded 3
terminal 120Vac or 230Vac 50/60Hz outlet.
DIMENSIONS (inches)
OPERATION
Once the unit is mounted and all wiring is connected per the
INSTALLATION section instructions, connect a dc voltmeter to
the output load terminals and apply AC power to the input.
Check that the DC output voltage is within the normal range for
the model in use.
The unit will now power the load and trickle charge the optional
back up battery at the rated output voltage setting of the unit.
The output will continue to be powered directly from the
battery if the AC input is off for any reason; ensuring critical
loads are powered continuously.
USING the OPTIONAL BACKUP BATTERY
The CM Series uses an isolation diode between the BAT
terminal, and the Load + output. When in back-up mode the
voltage supplied to the load will be the external battery voltage
less the drop across the diode, which is approximately 0.6V. So
for example a battery at a voltage of 12.7V will provide
approximately 12.1V to the load.
For prolonged AC outages, the battery may be discharged to a
very low level, as there is no internal low-voltage-disconnect
device. It is good practice to ensure the battery has enough
capacity to power the load for long durations and still ensure it
is not discharged below approximately 11V. This will help to
prevent permanent loss of battery capacity due to over-
discharge.
Excessive load current from the battery is limited by an internal
ATO type fuse. A short circuit or other over-current event on
the load wiring will cause this fuse to open, protecting the
internal circuitry. This fuse may be replaced by disconnecting
the unit from all power sources, removing the cover, and
replacing fuse F3 with an ATO fuse rated 25A (12V model) 15A
(24V model) or 15A FKS-ATO (48V model)
The output voltage may be adjusted slightly to better match the
float voltage ratings of specific batteries, by setting the trim-pot
as shown with an insulated adjusting tool.
Disconnect any loads or battery, and connect an accurate
voltmeter to the output terminals. With the unit powered
observe the output voltage and slowly adjust the output setting
to the desired level using an insulated adjusting tool.
Output Voltage Adjustment Trim Pot
Switch off the AC power and reconnect all output wiring.