Page 1
PHASE OUT / DISCONTINUED
Check Availability
Sentinel 70/140 series
Automatic Battery Chargers
INSTALLATION AND OPERATION
THIS MANUAL REFERS TO THE FOLLOWING MODULES
SNS70
SNS140
SNL70
SNL140
ESNS70
ESNS140
ESNL70
ESNL140
For safe and correct use of these chargers, read and save the safety
information that precedes the installation and operation instructions.
This guide contains 6 pages (including this one). If any pages are missing,
contact the battery charger supplier or manufacturer for replacement
documentation.
Sentinel (SNS shown) Enclosed Sentinel
A division of Frank W Murphy Ltd.
41 – 46 Railway Terrace, Nechells, Birmingham, B7 5NG, United Kingdom
tel: +44 121 327 8500
fax: +44 121 327 8501
email: sales@computroniccontrols.com
web: www.computroniccontr ols.com
CCL – Sentinel 70/140 installation and operation ci0012 issue 3 6th May 2011 p1/6
Page 2
PHASE OUT / DISCONTINUED
Check Availability
IMPORTANT SAFETY INFORMATION – READ AND SAVE THESE INSTRUCTIONS
This manual contains important safety and operating instructions for all (non UL approved) SN and ESN models.
Do not expose the battery charger to rain, snow or wet environments.
The use of any attachment not recommended or sold by the battery charger manufacturer may result in risk of fire,
electric shock or injury to persons.
Do not operate charger if it has received a sharp blow, been dropped, or otherwise damaged in any way: return to
supplier.
Do not disassemble the charger: return to supplier when service or repair is required. Incorrect re-assembly may result in
a risk of electric shock or fire.
WARNING – RISK OF EXPLOSIVE GASES
WORKING IN THE VICINITY OF A LEAD ACID BATTERY IS DANGEROUS. BATTERIES GENERATE EXPLOSIVE
GASES DURING NORMAL BATTERY OPERATION.
To reduce the risk of battery explosion, follow these instructions and those published by the battery manufacturers and the
manufacturer of any equipment you intend to use in the vicinity of the battery. Review cautionary marking on these products
and any attached equipment.
PERSONAL PRECAUTIONS.
(i) Someone should be within range of your voice or close enough to come to your aid when you work near a lead-acid
battery.
(ii) Have plenty of fresh water and soap nearby in case battery acid contacts skin, clothing or eyes.
(iii) Wear complete eye protection and clothing protection. Avoid touching eyes whilst working near batteries.
(iv) If battery acid contacts skin or clothing, wash immediately with soap and water. If acid enters eyes, immediately flood
eyes with running cold water for at least 10 minutes and get immediate medical attention.
(v) NEVER smoke or allow a spark or flame in vicinity of battery.
(vi) Be extra cautious to reduce risk of dropping a metal tool on to the battery. It may spark or short-circuit the battery or
other electrical part that may cause explosion.
(vii) Remove personal metal items such as rings, bracelets, necklaces and watches when working with a lead-acid
battery. A lead–acid battery can produce a short-circuit current high enough to weld a ring or the like to metal, causing a
severe burns.
(viii) Use the charger only for charging batteries as stated on the charger. Do not use the battery charger for charging
dry-cell batteries that are commonly used with home appliances. These batteries may burst and cause injury to persons
and damage to property.
(ix) NEVER CHARGE A FROZEN BATTERY
PRIOR TO INSTALLATION /COMMISSIONING
Clean battery terminals. Be careful to keep corrosion from coming into contact with eyes.
Add distilled water in each cell until the battery acid reaches a level specified by battery manufacturer. This helps purge
excessive gas from the cell. Do not overfill. For a battery without cell caps, carefully follow manufacturer’s recharging
instructions.
Study all battery manufacturer’s specific precautions, such as removing or not removing cell caps while charging and
recommended rates of charge.
Determine the voltage of battery by referring to engine manual and ensure this matches the charger’s output voltage.
CHARGER LOCATION AND CONNECTION
Never place the charger directly above battery being charged: gases from the battery will corrode and damage the
charger.
Never allow battery acid to drip on to the charger when reading specific gravity or filling battery.
Do not operate the charger in a closed-in area or restrict ventilation in any way.
The battery charger should be connected to a grounded, metal, permanent wiring system; or an equipment–grounding
conductor should be run with circuit conductors not connected to equipment-grounding terminal on the battery charger.
Connections to the battery charger should comply with all local codes and ordinances.
SNS/SNL models – these battery chargers should be installed so that they are not likely to be contacted by people.
ESNS/ESNL models – the AC wiring should be independent of the DC and alarm wiring. Use 2x 2.5mm (total wire
Ø=5mm²) or larger wire for DC (charger to battery) leads. Use 2.5mm² or larger for input and ground connections.
For safe and correct use of the charger, follow the following steps. Should you have any problems or the unit does not
function as expected, consult our troubleshooting guide at the end of these instructions.
Visually inspect unit for any signs of damage, caused by transport or storage.
Mount the charger as outlined above, paying attention to ambient temperature.
Ensure the mains AC supply is isolated, and ensure the correct rated input voltage before connection.
Ensure the charger is earthed at the marked earth stud.
Check batteries in accordance with the manufacturer’s guidelines.
Check that the charger is correct for battery type and voltage.
Connect the charger to the batteries, observing correct polarity and ensuring a secure and tight connection.
Switch on charger at the mains AC supply.
CCL – Sentinel 70/140 installation and operation ci0012 issue 3 6th May 2011 p2/6
Page 3
Prod
ifi
PHASE OUT / DISCONTINUED
Check Availability
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.
WARNING
BEFORE BEGINNING INST ALLATION 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
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).
uct spec
power supply:
supply voltage, 120 V units:
240 V units:
operating frequency
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
general:
operating temperature -20 to +55°C
humidity 20% to 90% RH
dimensions see table overleaf
weights (approx.): SNS, SNL
ESNS, ESNL
EMC emission / immunity EN50081-2 / EN50082-2
Output calibration
Battery type float volts
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.
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.
cation
(E)SNS70
(E)SNL70
(switched SPNC relay contact,
0.55 Kg / 1.2 lb, 0.6 Kg / 1.3 lb
1.3 Kg / 2.9 lb, 1.4Kg / 3.1 lb
(E)SNS140
(E)SNL140
(24V)
85 – 135 V ac
185 – 305 V ac
47 – 63 Hz
negative DC during fault
de-energising on fault),
1A max. @ 30 VDC
(resistive load)
(V DC)
(E)SNS140
(E)SNL140
(12V)
boost volts
(V DC)
CCL – Sentinel 70/140 installation and operation ci0012 issue 3 6th May 2011 p3/6
Page 4
PHASE OUT / DISCONTINUED
Check Availability
CAUTION: Sentinel chargers should be handled by the circuit board cover (on SNS/SNL modules) or steel
enclosure (ESNS/ESNL models). Care should be taken not to handle static sensitive components on exposed
circuit boards.
DIMENSIONS AND ASSEMBLY
SNS
ESNS/ESNL
SNL
Overall:-
W
H1
H2
D
Fixing holes:-
X
Y1
Y2
These chargers are designed for mounting on a vertical
facia inside an enclosed control panel or housing.
Mounting orientation should be as shown above.
For safe heat dissipation, mount Sentinel in the orientation
shown, with a minimum air-gap clearance of 40mm
above/below and 25mm at the sides. Consideration must be
given to ventilation for proper heat dissipation.
For surface mounting, use the 2 centre slots (Ø 6mm)
or 4 corner slots (Ø 6mm). Ensure that the mounting
studs/bolts/nuts/screws adequately support the charger,
and are tightened sufficiently to not to become loose during
normal use, e.g. due to engine/equipment vibration.
Optional clip for DIN rail mounting (2 required for each
charger), part number 045-0001.
SNS SNL
105mm / 4.13”
130mm / 5.19” 150mm / 5.91”
117mm / 4.61”
72mm / 2.83”
99mm / 3.90”
65mm / 2.56” 75mm / 2.95”
n/a 65mm / 2.56”
These chargers are designed for wall or frame mounting
Mounting is via the enclosure back-plate, using 4 holes
Access to the electrical connection terminals is via
Electrical cable entry is via knock-outs on either side
Connect the charger wiring as detailed in the following
Overall:-
W
H1
H2
D1
D2
Fixing holes:-
X
Y
in the orientation shown above, with enclosure air vents
uppermost. Adequate consideration should be given to
ventilation for proper heat dissipation.
(Ø 6mm) on the upper and lower edges. Ensure that the
mounting studs/bolts/nuts/screws adequately support the
charger weight, and are tightened sufficiently to not to
become loose during normal use (e.g. due to
engine/equipment vibration).
removable / hinged sections on the front facia. Remove the
6 x securing screws (marked F above), then remove or
rotate the upper and lower sections through 90 degrees.
of the enclosure, which must be carefully removed from the
enclosure sides. A suitable cable-gland (20mm/0.8” diam.)
must be used to prevent damage to cables and stop
unwanted entry into inner part of charger.
section, “Electrical connection”. When wiring is complete,
and before using the charger, re-secure the hinged
sections using the 6 fixing screws.
142mm / 5.59”
268mm / 10.55”
85mm / 3.35”
130mm / 5.12”
222mm / 8.74”
64mm / 2.52”
274mm / 10.79”
CCL – Sentinel 70/140 installation and operation ci0012 issue 3 6th May 2011 p4/6
Page 5
PHASE OUT / DISCONTINUED
Check Availability
WARNING: DANGER OF INJURY OR DEATH. During normal operation, Sentinel is
connected to high voltage AC circuits. Before connection, disconnection or handling of
DANGER !
HIGH VOLTS
these chargers, ensure isolation of all AC power supplies. Connection or disconnection
with live wiring can also cause hazardous sparking and component damage.
ELECTRICAL CONNECTION
General
Electrical connection is via screw terminal blocks on the
Sentinel circuit board.
For SNS models:-
For SNL models:-
On enclosed ESNS/ESNL models, an additional terminal
block provides convenient connection of AC supply and
DC output. The AC supply Earth must be connected to the
stud connector on the metal enclosure, as shown below.
For ESNL models:-
DC Output
Before DC connection or disconnection: Ensure AC supply input is isolated.
Disconnecting the batteries while the
AC supply is live can result in sparking at
the battery terminals, ignition of battery
gasses and serious personal injury.
Check that the charger output is compatible
with battery type & voltage. Incompatibility
may result in damage to the charger,
batteries and serious personal injury.
Connect the Sentinel output to the battery terminals,
observing the warnings above and the correct DC polarity.
The Sentinel output includes a self-resetting polyfuse
for protection of reverse polarity and short-circuit faults.
In the event of such faults, isolate the AC supply,
disconnect the output terminals and allow the fuse to reset;
replacement of the fuse should not be necessary. The
charger can then be re-connected and switched back on. If
the fuse fails to reset, return the charger to the supplier.
Auto Boost Initiate
On (E)SNL chargers, two terminals may be linked
(e.g. using an operator-controlled momentary push button
or panel switch) to give manual initiation of an Auto Boost
cycle (at any time, regardless of battery voltage).
Alarm output
All Sentinel models include a relay-based output for
remote signalling of faults. During fault conditions, the
relay de-energises and the output gives a negative DC
signal, rating 1A max. at 30 VDC.
(E)SNS models monitor charge fail faults, i.e. AC supply or
fuse failure, DC fuse failure or low/zero current output.
(E)SNL models monitor for charge fail faults, plus battery
low voltage and battery high voltage.
The alarm relay de-energises immediately on detection of
a charge fail fault, and 120 sec after detection of low or
high battery voltage faults (to allow for normal voltage
variations, e.g. during engine cranking).
AC Input (power supply)
Before AC connection, disconnection or fuse
replacement:-
Isolate the AC supply
Ensure a good earth connection to the earth
stud on the charger’s metal chassis.
Ensure the AC supply voltage is compatible
with the charger’s supply rating. Exceeding
the rated voltage may result in damage
to the charger and connected equipment,
and cause serious personal injury.
All Sentinel models are fitted with mains AC input fuses,
with ratings as labelled on each charger.
CCL – Sentinel 70/140 installation and operation ci0012 issue 3 6th May 2011 p5/6
Page 6
PHASE OUT / DISCONTINUED
Check Availability
TROUBLESHOOTING FLOWCHART
CCL – Sentinel 70/140 installation and operation ci0012 issue 3 6th May 2011 p6/6
Loading...