Computronic Controls Sentinel 70 - Manual (Page 3)

CCL – Sentinel 70/140 installation and operation ci0012 issue 3 6 th May 2011 p3/6
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 Sentinel range provides automatic, current limited
and voltage controlled charging of wet lead acid, VRLA or
NiCd batteries. The units may be used in a wide range
of industrial charging applications, including standby
engines, pumps and generators.
Sentinel uses switch mode power supply technology to
give a compact and lightweight construction, improved
efficiency and low heat dissipation, wide supply voltage
tolerance and low output ripple.
Sentinel chargers are available as a module for surface
mounting in an enclosed panel (SN models), or as a
stainless steel, wall-mounted enclosure with DC charge
ammeter (ESN models). SNS and ESNS models provide
basic charging, while SNL and ESNL models have
higher specification features. For all models, electrical
connection of the AC supply, battery and control circuits is
via screw terminals.
Float charge operation
Sentinel operates an intelligent, multi-stage battery charge
regime. In normal charging mode, the charger 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, Sentinel will
typically supply 1.05 Amps.
Auto boost operation
SNL and ESNL models include an Auto boost feature.
Auto boost provides a temporary increase in output voltage,
equalising the battery charge between cells
and maximising battery life and capacity.
Auto boost is triggered automatically when the battery
falls below a preset voltage, or can be initiated manually
by linking two ‘boost’ terminals, e.g. via a momentary
push-button or panel switch. Once the batteries have
reached the boost voltage level, Sentinel reverts to its
normal float charge mode, preventing battery over-charge
and gassing.
Temperature compensation and RTC option
The optimum charge voltage for lead acid and NiCd batteries
varies with ambient temperature. All Sentinel chargers
include on-board temperature sensing and output
compensation (3mV/cell decrease for each °C increase).
For even greater temperature accuracy, ‘RTC’ option units
include a remote temperature sensor with 3 metre lead
assembly (other lengths available to special order).
Alarm output
All Sentinel chargers include an alarm relay output. On
SNS models, the relay de-activates immediately during
a charge fail condition (e.g. AC supply/fuse failure, DC
fuse failure or low/no charge current). On SNL models,
the relay also de-activates on high or low battery
voltage faults, but only after a 120 second delay, to
allow for normal battery voltage variations, e.g. engine
cranking.
Warranty and servicing
Sentinel chargers are supplied with a 2 year warranty on
parts and workmanship.
WARNING: Sentinel 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. If in doubt, please contact your local Computronic representative.
Product specification
power supply: (E)SNS70
(E)SNL70 (E)SNS140
(E)SNL140
(24V)
(E)SNS140
(E)SNL140
(12V)
supply voltage, 120 V units:
240 V units:
operating frequency
85 – 135 V ac
185 – 305 V ac
47 – 63 Hz
DC charge output:
maximum current 5 5 10
nominal voltage 12 24 12
line regulation +/- 1%
load regulation +/- 1%
output ripple < 1%
float / boost voltages see table overleaf
alarm output:
output polarity
current rating negative DC during fault
(switched SPNC relay contact,
de-energising on fault),
1A max. @ 30 VDC
(resistive load)
general:
operating temperature -20 to +55°C
humidity 20% to 90% RH
dimensions see table overleaf
weights (approx.): SNS, SNL
ESNS, ESNL 0.55 Kg / 1.2 lb, 0.6 Kg / 1.3 lb
1.3 Kg / 2.9 lb, 1.4Kg / 3.1 lb
EMC emission / immunity EN50081-2 / EN50082-2
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.
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