Model C2197B PT L120C-D Dual PSU/Battery Charger0 pages

Powerterm L120C-D Dual Voltage PSU/Battery Charger
Model C2197B 120W 12/24Volt Power Supply/ Battery Charger

DATASHEET
•

Supply both 12Vdc 1Amp and 24Vdc 3 Amps
average power to loads in a single product.

•

Ideal for RTU’s, dataloggers, remote field
instrumentation, alarm systems, etc. where
24Volts is required for instrumentation and
12Volts is required for radios etc.

•

Battery Management Functions include Low
Voltage Cut-out, temperature compensation
and current limited dual mode battery charging .

Features
•
•
•

True 12/24Volt Split Battery Charge Equalisation
Under-voltage cut-out to protect battery from deep
discharge.
AC detect output for mains monitoring.

OVERVIEW
The Powerterm L120C-D is a combined Power Supply and
Battery Charger for small uninterruptible instrument supply
applications where 12Volts and 24Volts are required.
Providing both 24Volts and 12Volts in battery standby systems
can be inconvenient and costly. While 12Volts is available in
24Volt battery systems by centre-tapping the two series
connected 12Vdc batteries, this has been impractical to use
until now because of the different charging requirements of the
two batteries.
The unique PTL120C-D dual voltage charger now makes this
possible by the provision of true split rail battery charging to
provide balanced charging to both batteries even when 12Volts
loads are tapped from the battery set.
The Powerterm L120C-D is the only charger component
required for the system , reducing space and cost.
And unlike the use of 24V to 12V converters, the 12Volt load is
connected to the battery, providing a low impedance supply
required by some radio transmitters. This configuration also
allows larger currents to be drawn intermittently from the
12Volts such as radio transmit currents which can be much
larger than the average current required when receiving.
Applications include RTU’s, dataloggers, remote field
instruments and alarm systems where the requirement exists to
power both 12Volt equipment (s uch as radios) and 24Volt
instruments .

BATTERY MANAGEMENT
During prolonged power outages, the back-up batteries will
eventually discharge. If the load remains connected, the
batteries can enter their “deep” discharge phase, which can
cause irreparable damage to the batteries, and reduce their
capacity and life expectancy.

•
•
•

Temperature compensation for optimum battery
float voltage in changing ambient temperatures.
Universal 85-264Vac mains supply
DIN Rail mounting with small panel footprint

The PTL120C-D incorporates a low voltage cut-out that
disconnects the loads when either battery voltage falls below its
low voltage threshold.
The maximum float voltage necessary to ensure full charge, but
not overcharge, is temperature dependent for lead-acid
batteries. If the installation is in an environment with widely
fluctuating temperature, then fixed voltage chargers will either
under-charge or over-charge the batteries.
The PTL120C-D is provided with external temperature
compensation so that the float voltage to the batteries is held at
its optimum value at all times. Use Model C0003 Temperature
probe (supplied separately).

DUAL MODE CHARGING
All sealed lead acid battery manufacturers specify a maximum
charging current for the correct life and safe operation of sealed
lead acid batteries. This maximum charging current for a battery
is based upon the Ampere-hour capacity of the battery. Many
conventional switch mode power supplies do not control their
maximum delivered current and can cause batteries to be
charged from flat with current levels that exceed the
manufacturer’s recommendation. The PTL120C-D provides
dual-mode charging, with a well defined battery current limit, so
that even when the batteries are discharged, the charging
current will be controlled.

SYSTEM MONITORING
The PTL120C-D provides an AC OK contact output. This output
can be used to detect power failures without the need for an
additional mains detection relay.

BATTERY TESTING
Using the Test Input, the health of the batteries can be
checked. This function can be included in programmable
remote equipment for highest availability of the standby system.

Copyright Omniflex ♦ Subject to change without notice

Datasheet DSC2197BR08 sheet 1 of 5

http://www.omniflex.com
®