Computronic Controls Sentinel 150 User Manual

ci0033

issue 4, 2015-09-03

Sentinel 150 series

Automatic switch mode battery chargers
Installation, Operation and Maintenance

This Manual Refers to the Following Models

Standard models

UL recognised/listed models

Open frame

models

SNTL1501205CDxx
SNTL1502405CDxx
SNTL1501210CDxx

SNTLUL1501205CDxx
SNTLUL1502405CDxx
SNTLUL1501210CDxx

Enclosed

models

ESNTL1501205CDxx
ESNTL1502405CDxx
ESNTL1501210CDxx

ESNTLUL1501205CDxx
ESNTLUL1502405CDxx
ESNTLUL1501210CDxx

ESNTLUL1501210CDxxNFPA

Note: “xx” above refers to battery type options specified on order: see pages 3 and 6 (DC Output calibration) for battery types/voltages.

For safe and correct use of these chargers, read and save the safety
information that precedes the installation and operation instructions.

This guide contains 8 pages (including this one). If any pages are missing,
contact the battery charger supplier or manufacturer for replacement
documentation.

Sentinel 150 (open-frame, with protective cover)

SNTL150 model shown

Enclosed Sentinel 150

ESNTLUL150 (left) and ESNTLUL150xxNFPA (right) models shown

For sales & support, contact:

ENOVATION CONTROLS LTD.

Church Road, Laverstock,
Salisbury, SP1 1QZ, United Kingdom
Phone: [phone]
Fax: [phone]
E-mail: [e-mail]
Web: www.computroniccontrols.com
www.fwmurphy.eu/computronic

ENOVATION CONTROLS

5311 S 122nd East Avenue,
Tulsa, OK 74146, USA

Phone: [phone]
Fax: [phone]
E-mail: [e-mail]

[e-mail]

Web: www.fwmurphy.com

Sentinel 150 installation, operation & maintenance

ci0033 p2/8 issue 4 2015-09-03

Important Safety Information – Read and Save These Instructions

This manual contains important safety and operating instructions for all SNTL150, SNTLUL150, ESNTL150 & ESNTLUL150
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 the 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, fire or faulty operation.

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 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, eyes or clothing.
 (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 batteries. High

power batteries 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 battery types as stated on the charger. Do not use the 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.
 Open frame SNTL models – these chargers should be installed so that they are not likely to be contacted by people.

 Wiring for the AC supply input, DC charge output and DC control (e.g. alarm output) circuits must be physically

separate, e.g. using separate wire harnesses and cable gland access. For AC input and ground leads, use 1mm²/17
AWG or larger wire conductors rated to 90°C/194°F. For DC (charger to battery) leads, use 2.5mm²/13 AWG or larger
wire on standard charger models, and 4mm²/11 AWG or larger wire on NFPA models.

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 terminal/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 the charger at the mains AC power supply.

Sentinel 150 installation, operation & maintenance

ci0033 p3/8 issue 4 2015-09-03

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

W A R NING

Specifications

power supply:

(E)SNTL(UL)

1501205

(E)SNTL(UL)

1502405

ESNTLUL

1501210
xxNFPA

operating voltage range:
standard (non-UL) models:
UL approved models
operating frequency

95 – 265 V AC
95 – 250 V AC

47 – 63 Hz

DC charge output:

nominal voltage

12

24

12

float / boost voltages

see DC output calibration table

current limit

5 5 10

line regulation

< 2%

load regulation

< 2%

output ripple

< 1%

alarm outputs:

charge fail /
mains AC failure
(UL models only)

solid state relay (switched +DC),

energised (+DC) during normal charge,

de-energised (open circuit) during fault

low battery volts
(NFPA models only):

solid state relay

(volt free/dry SPNC contacts),

energised (open) during normal charge,

de-energised (closed) during fault

high battery volts
(NFPA models only)

solid state relay

(volt free/dry SPNO contacts),

de-energised (open) during normal charge,

energised (closed) during fault

current rating (all relays)

250mA max. @ 30 V DC

(resistive load), UL class 2

general:

operating temperature

-20 to +60 °C / -4 to +140 °F

humidity

20% to 90% RH

dimensions

see Dimensions & Assembly

weights

see Dimensions & Assembly

electrical safety

2006/95/EC (EN 60065)

electromagnetic compatibility

2004/108/EC

(EN 61000-6-2, EN 61000-6-4)

UL approval:

All UL models:

BBGQ: UL1236,

CSA 22.2 no 107.2

ESNTLUL1501210xxNFPA
models only

BBHH: UL1236 SE

DC output calibration

Battery type:

model
option

code

float

volts

(V DC)

boost

volts

(V DC)

12V

Vented lead acid (6 cells)

LA

13.5

14.1

Calcium-Calcium (6 cells)

CA

13.8

15.6

VRLA, AGM (6 cells)

AGM

13.5

14.4

VRLA, Gel (6 cells)

GEL

13.5

13.8

NiCd (10 cells)

10NC

14.1

14.5

24V

Vented Lead acid (12 cells)

LA

27.0

28.2

Calcium-Calcium (12 cells)

CA

27.6

31.2

VRLA, AGM (12 cells)

AGM

27.0

28.8

VRLA, Gel (12 cells)

GEL

27.0

27.6

NiCd (18 cells)

18NC

25.6

26.1

NiCd (20 cells)

20NC

28.2

29.0

Note: Calibration figures at 20 deg C. Output voltage will vary if
temperature compensation is enabled – see Electrical Connection &
Configuration section.

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.

The Sentinel 150 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 an open-frame module
(with protective cover) for surface or DIN rail mounting in
an enclosed panel, or as a stainless steel, wall-mounted
enclosure with DC charge ammeter (and voltmeter on
NFPA models). Electrical connection of the AC supply,
battery and control circuits is via screw terminal blocks.

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 Specifications 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.

AutoBoost operation

All Sentinel 150 models include an AutoBoost feature.
AutoBoost provides a temporary increase in output
voltage, equalising the charge between cells and
maximising battery life and capacity.

AutoBoost is triggered automatically when the battery
falls below a preset voltage, or can be initiated manually
(whatever the battery voltage) via a momentary switch
input. Once the batteries have reached the boost voltage
level, Sentinel reverts to normal float charge mode,
preventing battery over-charge and gassing.

Temperature compensation

The optimum charge voltage for lead acid and NiCd
batteries varies with ambient temperature. Sentinel
can be configured to sense ambient temperature and
automatically compensate the output charge voltage.

Configuration is by links on the circuit board: temperature
compensation can be disabled, or enabled for use with a
remote ‘RTC’ sensor (available separately as a standard
3 metre / 9.8 feet lead assembly, or other lengths to
special order).

Alarm outputs

UL models include a self-diagnostic circuit charge fail /
main AC fail relay output (switched positive contact),
for driving a remote alarm or annunciator circuit.

Enclosed NFPA models include two additional relay outputs
(volt-free/dry contacts) for independent signalling of high
and low battery voltage faults, and compliance with the
NFPA 110 standard.