Computronic Controls Guardian - Manual (Page 3)

CCL Guardian series installation and operation ci0003 issue 4 2014-05-06 p3/8
BEFORE BEGINNING INSTALLATION OF THIS PRODUCT
Disconnect all electrical power to the charger
Make sure the charger cannot operate during installation
Follow all safety warnings of the battery manufacturer
Read and follow all installation instructions
WARNING
Description & operation
The Guardian range provides automatic, current limited
and voltage controlled charging of vented lead acid, sealed
lead acid or NiCd batteries. The units may be
used in a wide range of industrial charging applications,
including standby engines, pumps and generators.
Each charger consists of a transformer, rectifier and
thyristor control circuit. The Guardian range is available as
either an open frame module for mounting in an enclosed
panel, or as a wall-mounted enclosure with DC charge
ammeter and voltmeter. (Note: In the event of no AC supply
to the charger, the voltmeter displays the DC voltage of the
battery or connected DC equipment.)
Electrical connection of the AC supply, battery and
(boost/alarm) control circuits is via spring-clamp terminals.
(For more information on these terminals, see Computronic
Controls Product Change Ref: CCL PC Release 1
– April
2003)
Float charge operation
In normal charging mode, the Guardian maintains the
battery at a pre-calibrated float voltage (see table right),
while supplying any additional DC load up to the specified
current limit (see Specification right).
When fully charged, a battery will only accept the charge
required to replace internal losses (approx. 1mA per AH of
battery). E.g. for a system with a 1 Amp standing load and a
fully charged 50 AH lead acid battery, Guardian will typically
supply 1.05 Amps.
Auto boost (equalising) operation
Auto boost operation gives a temporary increase in output
voltage (see table right), equalising the charge between
cells and maximising battery capacity and service life.
Once the batteries have reached the boost voltage level,
Guardian automatically reverts to its normal float charge
mode, preventing battery over-charge and gassing.
Auto boost is triggered automatically when the battery falls
below a preset voltage. An Auto Boost cycle can also be
manually initiated (regardless of battery voltage) by linking
two ‘boost’ terminals, e.g. via a panel switch or push-button.
Temperature compensation
For both lead acid and NiCd batteries, the optimum charge
voltage varies with ambient temperature. On all Guardian
models, circuit board links allow output compensation to be
disabled, or enabled with an on-board temperature sensor,
or enabled with a remote sensor (RTC option, with 3 metre
lead for mounting on or near the battery). With this feature
enabled, output voltage decreases as ambient temperature
increases at a rate of 3mV/°C/cell (see calibration table
above for figures at 20°C).
Alarm outputs
Guardian provides 3 x NFPA110 compliant alarm relay
outputs: battery low volts and battery high volts (each with a
120 sec delay), and charge fail.
Warranty and servicing
Guardian chargers are supplied with a 2 year warranty on
parts and workmanship.
WARNING: Guardian battery chargers contain
no user serviceable parts, and should be
returned to the supplier in the event of failure.
No attempt should be made to repair the
charger. Any attempt to do so may invalidate
warranties, cause damage to the charger and
equipment, and result in serious personal injury.
GENERAL INFORMATION
Please read the following before installing. A visual inspection of this product for damage during shipping is
recommended before installation. It is your responsibility to ensure that qualified mechanical and electrical
technicians install this product. Failure to follow the recommended installation instructions will invalidate the
product warranty. If in doubt, please contact your local Computronic representative.
Product specification
power supply:
operating voltages
operating frequency 110 – 120 VAC ±6% or
230 VAC ±10% (specify)
50 or 60 Hz (specify)
DC charge output:
nominal voltage 12 or 24 V DC
float / boost voltages see table below
maximum current limit:
(E)G150-12V, (E)G300-24V
(E)G300-12V, (E)G600-24V
10 A
20 A
voltage ripple < 1%
alarm outputs:
charge fail, low volts &
high volts relays SPDT volt free contacts
contact rating 1A @ 30 V DC (resistive load)
general:
operating temperature -10 to +55°C
dimensions see ‘dimensions/assembly’ overleaf
weight see ‘dimensions/assembly’ overleaf
EMC emission / immunity EN61000-6-4 / EN61000-6-2
Output calibration
Battery type float volts
(V DC)
boost volts
(V DC)
12V Vented lead acid (6 cells) 13.5 14.1
Calcium-Calcium (6 cells) 13.8 15.6
VRLA, AGM (6 cells) 13.5 14.4
VRLA, Gel (6 cells) 13.5 13.8
NiCd (10 cells) 14.1 14.5
24V Vented Lead acid (12 cells) 27.0 28.2
Calcium-Calcium (12 cells) 27.6 31.2
VRLA, AGM (12 cells) 27.0 28.8
VRLA, Gel (12 cells) 27.0 27.6
NiCd (18 cells) 25.6 26.1
NiCd (20 cells) 28.2 29.0
Note: Calibration figures at 20 deg C. Output voltage automatically
decreases by 3mV per cell per 1°C increase in temperature.
Phase-out
/ Discontinued
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