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IMPORTANT SAFETY INSTRUCTIONS -
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SAVE THESE INSTRUCTIONS - SAFETY INSTRUCTIONS
This manual contains important safety and operating instructions for models SNSUL70, SNSUL140, SNLUL70, SNLUL140
ESNSUL70, ESNSUL140, ESNLUL70 and ESNLUL140.
Do not expose charger to rain or snow
Use of an 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, otherwise damaged in any way; return to supplier.
Do not disassemble charger, return to supplier when service or repair is required. Incorrect reassembly may result in a
risk of electric shock or fire.
WARNING - RISK OF EXPLOSIVE GASES
WORKING IN 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 battery manufacturers and manufacturer of any equipment you intend to use in vicinity of the battery. Review cautionary marking on these products and
on 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 while 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 medical attention immediately.
(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 onto 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 bat-
tery. A lead-acid battery can produce a short-circuit current high enough to weld a ring or the like to metal, causing a
severe burn.
(viii) Use charger only for charging batteries as stated on the charger. Do not use 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 in contact with eyes.
Add distilled water in each cell until battery acid reaches level specified by battery manufacturer. This helps purge exces
sive gas from cells. 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 rec
ommended rates of charge.
Determine voltage of battery by referring to engine manual and ensure matches charger’s output voltage.
CHARGER LOCATION AND CONNECTION
Never place charger directly above battery being charged, gases from battery will corrode and damage charger.
Never allow battery acid to drip on charger when reading specific gravity or filling battery.
Do not operate 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 battery charger.
Connections to battery charger should comply with all local codes and ordinances.
Open Frame Models - These battery chargers should be installed so that they are not likely to be contacted by people.
Enclosed Models - The AC wiring should be independent of the DC and alarm wiring. Use 2.5mm
(Charger to battery) leads. Use 2.5mm2For input and ground connections.
2
For safe and correct use of the unit follow the following steps, should you have any problems and 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 charger as outlined above, paying attention to ambient temperature
Ensure mains supply is isolated and connect observing the correct rated input voltage
Ensure unit is earthed at the marked earth stud
Check batteries in accordance with manufacturer guidelines
Check charger is correct for battery type and voltage
Connect unit to batteries, observing correct polarity and ensuring a secure and tight connection
Switch on unit at mains supply
Sentinel Installation Instructions - June 07 - Page 2 of 6
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GENERAL INFORMATION (ctd)
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Current Limiting
The Sentinel Battery Charger is current limited and will
only output the rated current of the charger (see chart
below)
SENTINEL CURRENT RATINGS
MODEL RATING
SNxUL70 & ESNxUL70 5A
SNxUL140 & ESNxUL140 12V 10A
SNxUL140 & ESNxUL140 24V 5A
Dimensions
figure 1a - Open frame models
HEIGHT
WIDTH WIDTH
SNLUL Range
HEIGHT
SNSUL Range
Battery Charged Condition
When charged the battery will only accept a charge to
replace the losses within the battery (approx. 1mA per AH of
battery). If there is a standing load (i.e. the panel controller
etc) the charger will output the standing load plus the losses
to the battery i.e. if a standing load of 1A is present with
50AH Vented Lead Acid batteries then charger will supply
1.05 amps.
A charged battery with open circuit terminals (i.e. no load
connected) will always be higher than nominal battery voltage (i.e. 12.6 on a 12V lead acid battery)
figure 1b - Wall mounted enclosed models
HEIGHT
WIDTH DEPTH
W
SNLUL
SNSUL
W
105mm
4.1”
105mm
4.1”
D
70mm
2.75”
70mm
2.75”
H
150mm
5.9”
130mm
5.1”
Weight
0.6Kg
1.3lbs
0.55Kg
1.2lbs
ESNLUL
ESNSUL
D
115mm
4.5”
115mm
4.5”
140mm
140mm
5.5”
5.5”
H
281mm
11. 1”
281mm
11. 1”
IMPORTANT ASSEMBLY INSTRUCTIONS -
SAVE THESE INSTRUCTIONS
OPEN FRAME MODELS -
SNSUL70, SNSUL140, SNLUL70 & SNLUL140
The charger must be mounted as shown in Figure 2a, with heatsink fins
in vertical position.
2 or 4 screws should be used to mount charger to panel. Ensure screws
are tightened firmly as as not to become loose during normal use on
engine.
Adequate consideration should be given to ventilation for proper heat
dissipation.
WALL MOUNTED ENCLOSURE MODELS -
ESNSUL70, ESNSUL140, ESNLUL70 & ESNLUL140
The charger must be mounted as shown in Figure 2b.
By unscrewing the fixing screws the faces can be opened on their
hinges, to allow access to the internal connections.
Cable entry is via knock-outs on either side of the unit, these must be must
carefully removed from the enclosure sides.
A suitable cable-gland (20mm/0.8” DIA) should be used to prevent
damage to cables and stop unwanted entry into inner part of charger.
See “Electrical Connection” for details of terminal connections.
The lower face should be firmly screwed to the charger before use.
Four screws should be used to mount charger to panel. Ensure screws
are tightened firmly as as not to become loose during normal use on
engine.
Adequate consideration should be given to ventilation for proper heat
dissipation.
A
B
SNLUL Range SNSUL Range
SNSUL
All models (mm)
A
95
B
Figure 2a open frame models
A
SNLUL
All models (mm)
95
130
Weight
1.6Kg
3.5lbs
1.6Kg
3.5lbs
Fixing Holes
Fixing Holes
Fixing hole dimensions:
Width (between holes) - 66mm / 2.6”
Height (Between holes) -274mm / 10.75”
Fixing holes Ø=6mm (0.2”)
Figure 2b wall mounted enclosure models
CAUTION: When handling chargers, care should be taken not to place excessive strain on either the heatsink, PCB,
transformer or connecting wires. Unit should be handled by main heatsink/case (open frame models) or steel enclosure
(enclosed models).
Sentinel Installation Instructions - June 07 - Page 4 of 6
Page 5
IMPORTANT OPERATING INSTRUCTIONS -
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SAVE THESE INSTRUCTIONS
Before operating the battery charger, ensure that the charger is assembled and installed as per the
section listed in these instructions.
Terminal Connection Information
SN UL70, SN UL140,L L ESNLUL70, ESNLUL140
DC OUT
-Vdc
+Vdc
Output: DCOut(1+2)tobattery
Input: AC supply
ALARM INDICATION -
Boost:
THERM:
THERM
CAUTION: Observe correct polarity
CAUTION: Observe correct voltage as stated on unit
Over Voltage, Under Voltage and Charge Fail
3 - Change over contact for common alarm signal
(See notes on connection of alarms - see right)
4 + 5 - Boost Initiate - Link these 2 connections to force
the charger from into a single boost cycle of operation.
(Once the charger has completed a single boost cycle
as outlined on page 3 of these instructions the charger
returns to it’s normal mode of operation)
1 + 2 - Connect correct stated value of thermistor for
monitoring remote battery temperature.
N/C
N/C
(To -Vdc)
(To -Vdc)
LINK FOR
LINK FOR
BOOST
BOOST
AC IN
N
L
GND
SNSUL70, SNSUL140, ESNSUL70, ESNSUL140
DC OUT
-Vdc
+Vdc
Output: DCOut(1+2)tobattery
Input: AC supply
ALARM INDICATION -
THERM:
N/C
N/C
(To -Vdc)
(To -Vdc)
THERM
CAUTION: Observe correct polarity
CAUTION: Observe correct voltage as stated on unit
Over Voltage, Under Voltage and Charge Fail
5 - Change over contact for common alarm signal
(See notes on connection of alarms - see right)
3 + 4 - Connect correct stated value of thermistor for
monitoring remote battery temperature.
Thermistor Values
12V Models - 10K Thermistor
24V Models - 20K Thermistor
AC IN
N
L
GND
AC
supply
+
+
Battery
-
-
boost boost
Alarm Contact
(Charge Fail, Under
and Over Volts)
Connection to Mains Supply:
Ensure supply is isolated before connection is made to charging unit
Ensure unit is properly earthed at earth stud (enclosed) on chargers metal chassis
CAUTION: Ensure correct AC voltage is supplied to unit, applying 240VAC on a
Connection to Batteries:
Ensure mains supply is isolated before connecting charger to batteries
Ensure battery type and voltage are correct before connecting to batteries
WARNING: Charging either different voltage or type of batteries from stated type
Disconnection of Batteries:
Ensure mains supply is isolated before disconnecting charger from batteries
WARNING: Disconnecting the batteries whilst mains supply is connected to the
Boost Initiate Connection:
The charger will be in it’s normal mode of operation whilst the boost link is bro ken, upon connecting the two boost initiate terminals the charger will perform a
single auto-boost cycle, whereby the charger outputs a higher voltage, once battery voltage has reached this point, the charger returns to it’s normal float mode
of operation.
Over Voltage, Under Voltage and Charge Fail Connection (if fitted):
In a de-energised state the COM - N/C contact is alarmed. The relay energises
on power up and changes state. The contact is common to -Vdc and rated at 1A
@ 30VDC.
Fuses:
All Sentinel models are fitted with mains input fuses at the required ratings (see
markings on chargers). Before replacing any fuses, ensure charger is isolated
from mains supply.
120VAC unit will destroy it and could cause serious personal injury.
may result in damage to both the charging unit and/or batteries and
could result in serious personal injury.
charger could result in a spark at battery terminals, this could ignite
the hydrogen given off from the batteries.
The Sentinel Range are fitted with a self-resetting polyfuse on the dc output. If reverse polarity or short circuit faults are made, isolate supply, disconnect the
outputs and allow fuse to self-reset. The charger can then be re-connected and switched back on. No replacement of output fuse should be necessary.
If fuse fails to reset, the charger should be returned to supplier. Ensure correct rating when replacing input fuses.
AUTOMATIC BATTERY CHARGER
The Sentinel-L (SNL and ESNL)range are automatic battery chargers, if voltage falls below a preset voltage (12.2V on a 12V lead-acid battery) they
automatically enter an increased charging voltage state (boost). Once the batteries have reached this point, the charger will switch to it’s normal “float”
voltage. this prevents over-charge, which in turn prevents the battery from over-gassing and subsequently maximises battery life.
WARNING: The Sentinel range is not USER SERVICEABLE. No attempt should be made to replace or repair the charger, any attempt to do so may
invalidate any warranties and could cause serious personal harm or injury as well as damage to both the battery charger and any connected devices.
In event of failure the charger should be returned to supplier.
ELECTRICAL CONNECTION
WARNING: DANGER OF INJURY OR DEATH. Before connection, disconnection or handling
of SENTINEL battery charger, ensure that all AC power supplies are isolated. Connection to or discon nection from live wiring can also cause damage to internal components.
Sentinel Installation Instructions - June 07 - Page 5 of 6
Page 6
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TROUBLESHOOTING FLOWCHART
Are batteries charging?
NO
Is a battery charger
connected?
YES
Is correct mains supply
present on terminals?
YES
Is output voltage correct for
batteries?
YES
MEASURING CHARGING VOLTAGEAND CURRENT
A
+
CHARGER
-
Figure (ii)
CURRENT FLOW FROM CHARGER TO BATTERY
If voltage at terminals is less than nominal battery voltage then the maximum rated charger current should
be present.
Note: Once battery is fully charged, output current should be between 0/1% and 0.5% of battery's AH
capacity plus any standing loads.
VOLTAGE RISE AT BATTERY TERMINALS
A gradual rise of voltage should be seen slowing as float voltage is reached. - batteries should NOT be
boost charged continuously (see page 3)
Note: If the battery voltage increases rapidly during charge and no or minimum current is measured then
Lead Acid @ 20ºC
the battery may have become sulphated and will not hold charge and may be unrecoverable
+
BATTERY
-
V
NO
NO
PROBLEM SOLVED
To check charger is working, follow these steps then consult expected conditions
for relevant battery type below.
(1 ) VOLTA GE
(2) CURRENT
between positive from charger and positive of battery (A on fig ii)
Connect battery charger
Check mains supply, fuses
- Place voltmeter across battery terminals (V on fig ii)
- Break the positive line to the battery and place an ammeter
and wiring.
NO
CURRENT FLOW FROM CHARGER TO BATTERY
The current should stay constant or near to constant
whilst charging.
VOLTAGE RISE AT BATTERY TERMINALS
A gradual rise of voltage should be seen until float
voltage is reached, once fully charged a slight drop in
Wet NiCad
battery voltage will be measured - batteries should
NOT be boost charged continuously (see page 3)
Replace with correct voltage
charger.
YES
Is output voltage correct
polarity on terminals?
Float: 13.7V 27.4V
Acid
Boost: 14.1V 28.2V
Lead
All Sentinel Models - The precalibrated float voltage should be present
12V 24V
Wet
Typical output with no battery or load connected:
NiCad
NO
12V (10 Cell) 24V (20 Cell)
Float: 14.1V 28.2V
Boost: 14.6V 29.2V
Check fuses and wiring.
YES
Is battery charger correct size
for battery?
Refer to genset manual for sizing of battery chargers to generator set. If
installing your own chargers, battery manufacturers recommend the
following: -
Minimum
YES
Is there a standing load
present?
YES
Is standing load current
greater than charger output
current?
REMINDER
The battery charger will need
to provide both the standing
load and minimum charge
current
I.e. if a charging current of 2A
is required, and the standing
load is 1A then the charger
YES NO
needs to be able to output a
total of 3 amps
charge current should be approximately 5% battery AH capacity
Maximum
charge current to be equal to 25% battery AH capacity
NOTE:
When batteries are normally charged by a charging alternator, a
Lead Acid
float battery charger rated at lower than the minimum charge current is
sufficient to keep batteries in fully charged state.
NO
Are electrolyte levels correct?
FACTORS CONTRIBUTING TO
• Physical damage to cells can cause
• High charging voltages will evaporate
Check charging voltage against battery type
WARNING:
at above 20 DEGREES CELSIUS the
NO
chargers output voltage should be
temperature compensated at -3mV/ºC/Cell
NO
YES
ELECTROLYTE LOSS
electrolyte to leak or evaporate
electrolyte
and voltage
If the batteries are being used
Are batteries at end of life?
Min Charge Current = AH Capacity of batteries
10
Max Charge Current = AH Capacity of batteries
Wet NiCad
5
YES
Two possible methods:
(1) Using Hydrometer or (2) Using a digital DC voltmeter
Step 1. Fully charge the batteries
Step 2. Disconnect batteries and leads and leave for 24 hours
Step 3. Measure either specific gravity (hydrometer) or terminal voltage
(voltmeter) and compare with table below.
% Charge Specific Gravity Voltage (DC) on a 12V battery
100 1.265 12.8
75 1.225 12.5
50 1.19 12.4
25 1.155 12.0
Lead Acid
Discharged 1.12 11.5
If the voltage across the terminals shows around 10.5V, this may indicate
a shorted cell is present.
Step 4. If time is limited due to on-site testing, remove surface charge by
either applying a 20A load for 3 minutes or crank engine for 10 seconds,
then disconnect batteries and leads and leave for minimum of 10 mins.
NOTE: On this method, providing batteries have been sized correctly for
engine and charged correctly, an open terminal voltage of 12.5V or
greater should be present.
Replace with correct size
charger.
Replace batteries
Battery Charger may be faulty
- Contact manufacturer
Top up batteries as per
manufacturers
Replace charger with correct
recommendations
size unit.
Sentinel Installation Instructions - June 07 - Page 6 of 6
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