yi6505

revision B, 2021-02-19

Sentinel 300P series

Automatic switch mode battery chargers
Installation, Operation & Maintenance
This manual refers to the following models
All models are UL recognised or listed
Open frame SNTL300P Base open-frame (protective cover) model.
models SNTL300PC As above, plus CAN J1939 communication.

Enclosed ESNTL300PM Enclosed model, analogue meters.

models ESNTL300PCL Enclosed model, CAN J1939 communications
and LCD display
ESNTL300PCLM Enclosed model, CAN J1939 communications,
LCD display and analogue meters.

For safe and correct use of these chargers, read and save the safety
information that precedes the installation and operation instructions.
This guide contains 12 pages (including this one). If any pages are
missing, contact the battery charger supplier or manufacturer for
replacement documentation.

Sentinel 300P (open-frame, with protective cover) Enclosed Sentinel 300P

SNTL300P model shown ESNTL300PCLM model shown
In order to consistently bring you the highest quality, full featured products, we reserve the right to change our specifications and designs at any time. MURPHY products and the Murphy
logo are registered and/or common law trademarks of Enovation Controls LLC. This document, including textual matter and illustrations, is copyright protected by Enovation Controls Ltd.,
with all rights reserved. © 2021 Enovation Controls Ltd. A copy of the warranty may be viewed or printed by going to https://www.enovationcontrols.com/warranty
 Important Safety Information – Read and Save These Instructions
This manual contains important safety and operating instructions for all SNTL300P and ESNTL300P 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, injury to persons or damage to property.
• 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 HIGH POWER BATTERY IS DANGEROUS. BATTERIES MAY GENERATE EXPLOSIVE
GASES DURING NORMAL OPERATION AND CHARGING.
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 or high
power 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 or chemicals contact skin or clothing, wash immediately with soap and water. If acid or chemicals enter the
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 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.
• For lead acid batteries, add distilled water in each cell until the battery acid reaches a level specified by the 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 battery voltage by referring to the engine manual and ensure this matches the charger’s output voltage.
CHARGER LOCATION AND CONNECTION
• Never place the charger directly above the battery being charged: battery gases will corrode and damage the charger.
• When reading specific gravity or filling batteries, never allow battery acid or chemicals to drip on to the charger.
• 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 supply and ground connections, use 1mm²/17 AWG or larger
wire conductors rated to 90°C/194°F. For DC (charger to battery) leads, use 4mm²/11 AWG or larger wire.
For safe and correct use of the charger, follow steps below. Should you have any problem or if 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 ventilation and ambient temperature.
• Ensure the mains AC supply is isolated, and of 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, number of cells 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.

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 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 Murphy representative.

Specifications

WARNING
Power supply
Operating voltage: 95 – 250 V AC
Operating frequency: 47 – 63 Hz.
DC Charge Output
Nominal voltage: programmable 12 or 24 V DC
Float/boost voltage: programmable, see ‘DC output calibration’ table
BEFORE BEGINNING INSTALLATION OF THIS PRODUCT Maximum current limit: 10 A
Disconnect all electrical power to the charger Voltage ripple: <1%
Make sure the charger cannot operate during installation Line regulation: <2%
Load regulation: <2%
Follow all safety warnings of the battery manufacturer
Read and follow all installation instructions Outputs x3 (optional x4 on non-CAN models):
All models:
1 x SPDT (RL1), 1 x SPNC (RL2), 1 x SPNO (RL3),
Sentinel 300P battery chargers provide new levels of DC dry/volt-free contacts (common feed for RL1, RL2 & RL3)
power control, monitoring and protection for standby battery Standard models (non-CAN configurations):
and engine starting applications. 1 x SPNC (RL4), dry/volt-free contacts
standard model output functions are compliant with NFPA 110
Advanced charger features included as standard: Rating (all relays): 1A max @ 30 VDC (resistive load), UL class 2
Switch mode charging technology: high power efficiency Inputs x2
and low heat dissipation, plus wide supply voltage tolerance,
Closed to negative DC to activate
in a compact and lightweight package.
Physical
Multistage charging: float, bulk, absorption and AutoBoost Operating temperature: –40 to +60°C / –40 to +140°F
stages ensure no compromise between rapid charge recovery Display viewability (LCD models only): 0 to 50°C / 32 to 122°F
and long term battery capacity and life. Humidity: 20% to 90% RH
Low output ripple: <1% ripple, beneficial for vented lead acid Dimensions: see Dimensions and Assembly section
Weights: see Dimensions and Assembly section
& NiCd cells, essential for VRLA, and configurable for use as
Electrical safety: 2014/35/EU, EN IEC 61204-7:2018
a stand-alone DC power supply. Electromagnetic compatibility:
AutoBoost: triggered automatically on low charge levels, or 2014/30/EU, EN55032:2015,
manually by remote switch, AutoBoost temporarily increases EN61000-6-2:2019, EN61000-6-4:2019
the charge voltage before returning to float mode. AutoBoost RoHS: EU 2015/863, EN IEC 63000:2018
equalises battery cell charge, maximising battery capacity and UL approvals
life, without overcharge and gassing. All (E)SNTL300P models:
BBGQ: UL1236, CSA 22.2 no. 107.2
Temperature compensation: ensures batteries are charged BBHH: UL1236 SE
at the optimal voltage, which varies significantly with ambient
temperature. Sentinel can measure temperature with a battery DC output calibration
mounted sensor and adjust output voltage to prevent under or
over charging.
float volts boost volts
In addition, the Sentinel 300P also provides:
Battery type: (V DC) (V DC)
Flexible configuration: microprocessor programmability for
12V Wet (vented) lead acid, 6 cells 13.5 14.1
automatic or manual configuration of output voltages (12 or
24V nominal), cell types/numbers and charging applications – Calcium-Calcium, 6 cells 13.8 15.6
all in one standard model. Programming is by circuit board Lead acid hybrid Sb-Ca, 6 cells 13.5 14.7
links and/or PC software configuration and monitoring tool. VRLA, AGM, 6 cells 13.5 14.4
Inputs & outputs: for remote charger control, and signalling VRLA, Gel, 6 cells 13.5 13.8
of charge fail, high/low battery volts and mains fail faults.
Standard model outputs comply with the NFPA 110 standard. NiCd, 10 cells 14.1 14.5
Non-standard input/output functions available to special order. 24V Wet (vented) Lead acid, 12 cells 27.0 28.2
Display, instrumentation and communication: options are Calcium-Calcium, 12 cells 27.6 31.2
available for LCD readout, analogue amp/volt metering and Lead acid hybrid Sb-Ca, 12 cells 27.0 29.4
CAN SAE J1939 communication. All models include RS485 VRLA, AGM, 12 cells 27.0 28.8
communication for configuration and control.
VRLA, Gel, 12 cells 27.0 27.6
The Sentinel 300P is available either as an open-frame NiCd, 18 cells 25.6 26.1
(UL-recognized) module for mounting in existing control
panels, or as a wall-mounted (UL-listed) stainless steel NiCd, 20 cells 28.2 29.0
enclosure with LCD and analogue metering options. Note: Calibration figures at 20 deg C. Output voltage will vary if
Electrical connection is by circuit board mounted screw temperature compensation is enabled – see Electrical Connection &
terminal blocks. On enclosed models, wiring harness access Configuration section.
is by knock-out cable gland holes in the case side.

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 Dimensions and Assembly
CAUTION: Sentinel 300P chargers should be handled by the circuit board cover (SNTL models) or steel enclosure
(ESNTL models). Care should be taken not to handle static sensitive components through exposed circuit boards
and terminals.

SNTL300P models ESNTL300P models

Overall:
W 158 mm / 6.22 in.
Overall:
H 208 mm / 8.19 in.
W 165mm / 6.50 in.
D 84 mm / 3.31 in. H1 300 mm / 11.81 in.
Fixing holes: H2 80 mm / 3.15 in.
X 150 mm / 5.91 in. D1 125 mm / 4.92 in.
Y 150 mm / 5.91 in. D2 130 mm / 5.12 in.
Fixing holes:
Weight:
X 63.5 mm / 2.50 in.
1.1 kg / 2.5 lb
Y 285.5 mm / 11.25 in.
Weight:
• These chargers are designed for mounting in a 2.0 – 2.1 kg / 4.4 – 4.6 lb
vertical plane inside an enclosed control panel or
housing. Mounting orientation should be as • These chargers are designed for wall or frame mounting in the orientation
shown above, with enclosure air vents uppermost. For safe heat
shown above, with electrical connection
terminals lowermost. dissipation, allow a minimum air-gap clearance of 40mm/ 1.5 in.
above/below and 25mm/1 in. at the sides. Consideration must be given to
• For safe heat dissipation, mount Sentinel in the ventilation for proper heat dissipation.
orientation shown, with a minimum air-gap
• Mounting is via the enclosure back-plate, using 4 holes/slots
clearance of 40mm/1.5 in. above/below and
25mm/1 in. at the sides. Consideration must be (Ø 6mm/0.24in.) on the upper and lower edges. Ensure that the
given to ventilation for proper heat dissipation. mounting studs/bolts/nuts/ screws adequately support the charger
weight, and are tightened sufficiently to not to become loose during
• For surface mounting, use the 2 centre slots (Ø normal use, e.g. due to engine/equipment vibration.
6mm/0.24in.) or 4 corner slots (Ø 6mm/0.24in.).
Ensure that the mounting studs/bolts/nuts/ • Access to the electrical connection terminals is via a hinged lower front
screws adequately support the charger, and are plate. Remove the 2 x securing screws (marked S above), and then rotate
tightened sufficiently to not to become loose the hinged section through 90 degrees.
during normal use, e.g. due to engine/equipment • Electrical cable harness entry is via knock-out ports on either side of the
vibration. enclosure, which must be carefully removed from the enclosure sides. A
• Optional clip for DIN rail mounting (2 required for suitable cable-gland (20mm/0.8in. diam.) must be used to prevent damage
each charger), part number 045-0001. to cables and stop unwanted entry into the inner part of charger. Wiring for
DC charge output (connector CN1), DC control (CN2) and AC supply input
(CN3) must be physically separate, e.g. using separate wire harnesses
and case access ports: see page 5 section Wire Harness Separation.
• Connect the charger wiring as detailed in the following Electrical
Connection section. When wiring is complete, and before using the
charger, re-secure the hinged front section using the 2 fixing screws.

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 Electrical Connection
WARNING: DANGER OF INJURY OR DEATH. During normal operation, Sentinel is
connected to high voltage AC circuits. Before connection, disconnection or handling of
these chargers, ensure isolation of all AC power supplies. Connection or disconnection
DANGER !
HIGH VOLTS with live wiring can also cause hazardous sparking and component damage.

Connection - General All models – wire harness separation

SNTL300P open-frame (protective cover) models: For all models, wire connections for the DC charge output
Open frame models use 3 circuit board mounted screw (connector block CN1), DC control signals (CN2) and AC
terminal blocks: input supply (CN3) must be physically separated, e.g. using
separate wiring harnesses to each connector block,
separately routed through the case/panel. For enclosed
ESNTL models, use separate cable gland access:

• CN1: a 4-way block for connection of the DC Charge

Battery DC Charge Output
Output. Use a 5 mm/0.2 in. flat-head screwdriver to
tighten/loosen the terminals. For the DC Output (10 Amp Before DC connection or disconnection:
max), use 4.0mm²/13 AWG or larger connecting wire.
• Ensure AC supply input is isolated.
For details of fusing, see the Battery DC Charge Output
Disconnecting the batteries while the AC
section following.
supply is live can result in sparking at the
• CN2: a 15-way block for connection of DC control signals: battery terminals, ignition of battery gasses
DC voltage sensing, temperature compensation remote and serious personal injury.
sensor, control inputs and outputs. Use a 2.5mm/ 0.1 in. • Check that the charger has been configured for
flat-head screwdriver to tighten/ loosen the terminals. compatibility with the battery type & voltage (see
Use 1mm²/17 AWG or larger wire for these connections. Configuration section below). Incompatibility
This connector block also includes terminals for RS485 may result in damage to the charger, batteries
and optional CAN (SAE J1939) communications: and serious personal injury.
use wiring in accordance with the appropriate data
communication standard (typically a twisted pair, with Connect the Sentinel output to the battery terminals,
shield grounded at one end only). observing the warnings above and the correct DC polarity:
• CN3: a 3-way block for connection of the mains AC live CN1 Function
and neutral power supply. Use a 5mm/0.2in flat-head pin
screwdriver to tighten/loosen the terminals. The AC supply 1, 2 + DC charge output
ground/earth must be connected to a separate M4 stud 3, 4 – DC charge output
marked FG (Frame Ground) on the charger chassis.
For all AC supply/ground wiring, use 1mm²/17 AWG or All (E)SNTL300P models include self-resetting electronic
larger wire conductors rated for 90°C/194°F. An AC fuse protection against reverse polarity, overload and short-circuit
holder is located next to CN3: for fuse details, see the AC faults. In the event of such faults, the DC output switches off,
Input (power supply) section following. protecting the charger. After a 4 second delay, Sentinel checks
the DC output connection: if the fault has cleared, the output
4 LEDs (coloured green, blue, yellow, red) above the terminal automatically re-activates; if the fault is still present, the output
blocks provide indication of configuration and operating status. deactivates again, and the delay/check cycle repeats.
Circuit board jumper J2 is for the configuration of automatic If the DC output fails to re-activate after a fault has cleared,
temperature compensation. For full details of LED and J2 contact your charger supplier for further advice.
operation, see Configuration and Operation section.
ESNTL300P (enclosed) models Float & AutoBoost output voltages
The DC charge output can be configured to give one of
Enclosed ESNTL models have the same circuit board several 12 or 24V ‘charge profiles’, each with Float and
terminal numbering as SNTL models. AutoBoost voltages that are optimised for the battery type
Access to the screw terminals, and access for the wiring and number of cells.
harness (via cable glands), is detailed in the Dimensions Charge profile configuration is either via circuit board DIP
and Assembly section. switches, or (on LCD models) using display menus and
control keys: see Configuration section below. Charge profile
can also be set using the SNTL300P-PCSUITE PC software
tool and RS485 communication link – see the separate
software manual for full details.

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 Electrical Connection (cont.)
Typical Connection:

Notes:
1. AC input fusing (F1): replaceable, circuit board mounted fuse, rating as shown on the product label.
2. DC output fusing: all models include a self-resetting electronic output fuse.
3. DC output is isolated from chassis.
4. connection shown for standard configurations with output RL4. (RL4 is not available on units configured for CAN communication.)

Battery DC voltage sense

J2 jumper Description
CN2 Function position /
pin mode
1 + DC voltage sense
(Factory default setting). Temperature
2 – DC voltage sense compensation is enabled automatically when a
These terminals are used to accurately measure battery remote RTC sensor is connected. For each 1°C
voltage, independently of the voltage drop that can occur change in ambient temperature above or below
External / 20°C (within the range -10 to +50°C), output voltage
between the battery and DC charge output (particularly at
disabled automatically varies by 3mV per cell. Increasing
higher charge currents, and with longer cables).
Accurate measurement of battery voltage allows Sentinel ambient temperatures cause decreasing output
to automatically compensate for volt drops in the charging voltages; decreasing ambient temperatures cause
circuit, by increasing charge voltage. increasing output voltages.
Connect the battery DC Sense terminals to battery positive If no RTC sensor is connected, temperature
and negative using 1mm²/17 AWG or larger wire. compensation is automatically disabled and the
output voltage does not vary with ambient
TC Temperature Compensation Sensor temperature.
Sensor connection and operating status is indicated
CN2 Function
by a blue LED – see Operation section for details.
pin
3 TC (temperature compensation) sensor Not for customer use. Temperature measurement
by internal sensor, for factory calibration only.
4 Ground (for RTC sensor)
These terminals allow optional connection of a Murphy Internal
RTC temperature sensor. With the sensor connected,
and the sensor head positioned to give the most accurate/ CN2 terminals 3 and 4 are designed for connection to a
representative measurement of battery temperature, Sentinel Murphy RTC sensor only. DO NOT connect other types of
automatically varies DC output voltage for optimal charging. temperature sensor, such as thermocouples, thermistors or
Circuit board jumper J2, located between terminal blocks CN2 resistance probes.
and CN3, must also be in the correct position: The standard RTC sensor (part code 42.70.3900) includes a
3 metre/10 foot lead assembly. Non-standard lead lengths
are available to special order.
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 Electrical Connection (cont.)
Inputs (control) CAN (Control Area Network) communications
All (E)SNTL300P models include two switch inputs for SNTL300PC, ESNTL300PCL and ESNTL300PCLM models
control purposes. On standard models: may be configured with a CAN 2.0B port for data exchange
CN2 Function and control with other CAN devices. The CAN connection
pin supports the SAE J1939 protocol commonly found in many
industrial engine applications, or custom CAN protocols to
5 Input 1: AutoBoost initiate. Allows the operator to OEM requirements. Connection:
manually initiate one AutoBoost cycle, regardless of
battery voltage. Activation is by momentary CN2 Function
connection to battery negative DC, e.g. using a pin
push-to-make panel button. 12 CAN Hi
6 Input 2: reduce output to nominal 12 or 24V. 13 CAN Lo
Connect input 1 to battery negative (e.g. via a switch These terminals include an internal 120 Ohm terminating
or relay contact) for as long as the output needs to resistor, designed for connection at the end of the CAN
be reduced, e.g. for remotely controlled battery test network. Connection wiring must be in accordance with
equipment. In this mode, Sentinel continues to the CAN 2.0B standard, typically a twisted pair and shield
support any DC load up to the 10 Amp current limit. cable of maximum network length 40 metres (132 feet), with
Non-standard control input functions are available to special the shield grounded at one end only.
order. RS485 communication
Outputs (alarm) All 300P models include an RS485 MODBUS data port:
All (E)SNTL300P models include at least three relay outputs, CN2 Function
RL1 – 3. An additional output RL4 is available on standard pin
(non-CAN) models/configurations. All output contacts are 14 RS485 A
dry/volt-free (RL1, RL2 and RL3 have a common power 15 RS485 B
feed), rated 1A @ 30VDC max.
These terminals include an internal 120 Ohm terminating
The standard, NFPA 110 compliant output functions are resistor, for connection at the end of an RS485 network.
shown below, but non-standard functions are available to Connection wiring must be in accordance with the RS485
special order: standard, typically a twisted pair and shield cable with the
CN2 Function shield grounded at one end only.
pin The RS485 port allows remote communication, configuration
7 Common power feed for RL1 – 3. Connect to the and monitoring with a PC running SNTL300P-PCSUITE
positive or negative DC supply as required. software. The port can also be used to transmit RS485
8 RL1 normally open (N/O) contact. Modbus data about battery and charger parameters, e.g. to a
9 RL1 normally closed (N/C) contact remote PLC, SCADA or other control/monitoring system. For
further details, please see separate literature for SNTL300P-
Standard function: charge fail. Relay RL1: PCSUITE software.
• energises (pin 8 closes to pin 7, pin 9 opens from
pin 7) during normal charging conditions. AC Input (power supply)
• de-energises (pin 8 opens from pin 7, pin 9 closes Before AC connection, disconnection or fuse
to pin 7) if a charge fail fault occurs for longer replacement:
than 2 minutes. • Isolate the AC supply
10 RL2 normally closed (N/C) contact. • Ensure a good ground/earth connection to
Standard function: low battery volts. Relay RL2: the ground/earth stud (marked FG) on the
• energises (pin 10 opens from pin 7) during normal charger’s metal chassis.
charging conditions. • Ensure the AC supply voltage is
• de-energises (pin 10 closes to pin 7) if a low battery compatible with the charger’s supply
DANGER !
voltage fault occurs for longer than 2 minutes. HIGH VOLTS rating. Exceeding the rated voltage may
11 RL3 normally open (N/O) contact. result in damage to the charger and
Standard function: high battery volts. Relay RL3: connected equipment, and cause
• de-energises (pin 11 opens from pin 7) during serious personal injury.
normal charging conditions • Fit only the fuse types/ratings shown on
• energises (pin 11 closes to pin 7) if a high battery each product’s label.
voltage fault occurs for longer than 2 minutes.
CN3 Function
Models not configured for CAN J1939 communication pin
include access to relay RL4:
1 AC supply live, 95 to 250 VAC, 47 to 63 Hz
CN2 Function 2 AC supply neutral
pin
Connect these terminals to the AC power supply. The AC
12 RL4 common (COM) contact, volt-free/dry supply ground/earth must be connected to the M4 stud
13 RL4 normally closed (NC) contact, volt free/dry marked FG (Frame Ground), located inside the charger
Standard function: Mains fail. Relay RL4: case near connector CN3.
• energises (pin 13 opens from pin 12) when the For AC input and ground connections, use 1mm²/17 AWG or
mains AC supply is healthy. larger wire conductors rated for temperature 90°C/194°F. All
• de-energises (pin 13 closes to pin 12) when the models include a replaceable anti-surge fuse (20mm, type T,
mains AC supply is off or failed. 3.15A) in a circuit board mounted holder, located next to
connector CN3.
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 Configuration and Operation
Operation
Power-up and POST sequence
At power up, Sentinel goes through a POST (Power On Self Test) sequence, including status indication using 4 LEDs
(located on the main circuit board above connector CN2). The sequence is:
POST LED display
1) LED test: all lit for 2 sec, all off for 2 sec:

2) Indication confirming standard 300P calibrations, 2 sec: Flashing sequence:

3) Indication confirming selected charge profile, 2 sec:

Nominal Battery type Profile name DIP switch settings
voltage (0 = off/down, 1 = on/up)

1 2 3 4 5 6
Auto / 12 or 24 wet (vented) lead acid AUTO DETECT 0 0 0 0 0 0 Flashing:
local (Local)
Auto / AUTO DETECT 0 0 0 0 1 0 Flashing sequence:
remote (Remote)

12V Wet (vented) lead acid, 6 cells 12V WET LA 0 0 0 1 0 0

Calcium Calcium, 6 cells 12V CA/CA 0 0 1 0 0 0
Lead acid hybrid Sb-Ca, 6 cells 12V LA HYBRID 0 0 1 1 0 0
VRLA, AGM, 6 cells 12V VRLA – AGM 0 1 0 0 0 0
VRLA, Gel, 6 cells 12V VRLA – GEL 0 1 0 1 0 0
NiCd, 10 cells 10 CELL NiCd 0 1 1 0 0 0
12V power supply 12V POWER SUPPLY 0 1 1 1 0 0
24V NiCd, 18 cells 18 CELL NiCd 1 0 0 0 0 0
NiCd, 20 cells 20 CELL NiCd 1 0 0 1 0 0
Wet (vented) lead acid, 12 cells 24V WET LA 1 0 1 0 0 0
Calcium Calcium, 12 cells 24V CA/CA 1 0 1 1 0 0
Lead acid hybrid Sb-Ca, 12 cells 24V LA HYBRID 1 1 0 0 0 0
VRLA, AGM, 12 cells 24V VRLA - AGM 1 1 0 1 0 0
VRLA, Gel, 12 cells 24V VRLA - GEL 1 1 1 0 0 0
24V power supply 24V POWER SUPPLY 1 1 1 1 0 0
After the POST sequence, the LEDs revert to indication of battery missing fault, it checks for reconnection once every
operating status. See LED Indication section below. minute (non-adjustable).
Auto mode battery detection Sentinel does not check for ‘battery missing’ during
Immediately after power-up, if an ‘Auto’ charge profile has AutoBoost operation, to ensure maximum charge rate is
been selected, the Sentinel 300P measures the connected maintained.
battery voltage and operates as follows: AutoBoost
Measured Operation If measured battery voltage falls below the Boost Initiate
voltage threshold (below 12.5 V for 12V nominal batteries, or below
<1V No output: battery missing fault signalled. 25.0 V for 24V nominal batteries), Sentinel adopts
1 to 16.0 V Charge output: 12V vented lead acid. AutoBoost mode (indicated by a slow-flashing yellow LED)
16.1 to 32 V Charge output: 24V vented lead acid. and charge output increases to the higher Boost voltage
Float mode level.
If measured battery voltage is within normal limits (above Once measured battery voltage has increased to the Boost
12.5 V for 12V nominal batteries, and above 25.0 V for 24V level, Sentinel enters a Boost Extension period (360 mins on
nominal batteries), Sentinel adopts float mode charging, standard units), during which time Boost voltage is
indicated by a constantly lit yellow LED. Sentinel maintains maintained and the yellow LED flashes rapidly.
the battery at the float voltage (appropriate for the selected At the end of the Boost extension period, output voltage and
battery type), and supplies any additional DC load current current reduces, but the yellow LED continues to flash
(up to the maximum rated 10 Amps). rapidly. In this Boost Decay phase, battery voltage naturally
Battery check decreases back towards float level. Sentinel then reverts to
float mode charging, indicated by a continually lit yellow
When in float charge mode, Sentinel periodically checks for LED.
a ‘battery missing’ fault. During this check, output current
reduces to nominal (12 or 24V) for approx. 30 seconds and AutoBoost can also be initiated manually by an operator,
the yellow LED goes off. regardless of battery voltage. This is achieved on standard
units through input 2: after input activation, e.g. by a
The default period for checking ‘battery missing’ is every 30 momentary push-to-make panel switch, Sentinel goes
minutes, but this time can be adjusted using the SNTL300P- through a single AutoBoost cycle.
PCSUITE configuration tool. Once Sentinel registers a
Sentinel 300P installation, operation & maintenance yi6505 revision B 2021-02-19 p8/12
 Configuration and Operation (cont.)
DIP switch configuration
WARNING: AC and DC connections must be isolated during DIP switch configuration. The correct battery type
and cell number must be configured correctly before charger power-up and battery connection. Incorrect
configuration may result in under or over charge of batteries, which may cause failure or damage to the batteries,
charger and connected equipment, and result in serious personal injury.
All Sentinel models include a 6 way DIP switch for configuration of battery type and cell number. The DIP switch is accessible
through a cut-out in the case rear:
Open frame SNTL models Enclosed ESNTL models

DIP switch functions:

1–4 Sets the charge profile (battery type and cell number) when ‘local’ mode is selected – see switch 6 below.
5 Sets whether the Sentinel charge profile is set in local or remote mode:
Local mode: charge profile set by DIP switches 1 to 4. The default setting is ‘Local, Auto’, where Sentinel auto-
matically selects 12 or 24V operation based on the battery voltage measured at power up – see ‘operation’ below.
Remote mode: charge profile set by remote RS485 communication (e.g. SNTL300P-PCSUITE software), or (on
LCD models only) using display menu options. When remote mode is selected, the default charge profile is ‘Auto’.
6 Reserved use. Do not adjust from default (0/off/down) setting.
Nominal Battery type Profile name DIP switch setting voltage/time settings
voltage (0 = off/down,
1 = on/up)
1 2 3 4 5 6 float boost boost boost low high
(VDC) (VDC) initiate time alarm alarm
(VDC) (min) (VDC) (VDC)
DIP switches 1 – 4, local mode settings
12/24V Auto AUTO DETECT 0 0 0 0 0 0 13.5/ 14.1/ 12.5/ 360 12.0/ 16.0/
(12V or 24V wet lead acid) 27.0 28.2 25.0 24.0 32.0
12V Wet (vented) lead acid, 6 cells 12V WET LA 0 0 0 1 0 0 13.5 14.1 12.5 360 12.0 16.0
Calcium Calcium, 6 cells 12V CA/CA 0 0 1 0 0 0 13.8 15.6 12.5 360 12.0 16.0
Lead acid hybrid Sb-Ca, 6 cells 12V LA HYBRID 0 0 1 1 0 0 13.5 14.7 12.5 360 12.0 16.0
VRLA, AGM, 6 cells 12V VRLA – AGM 0 1 0 0 0 0 13.5 14.4 12.5 360 12.0 16.0
VRLA, Gel, 6 cells 12V VRLA – GEL 0 1 0 1 0 0 13.5 13.8 12.5 360 12.0 16.0
NiCd, 10 cells 10 CELL NiCd 0 1 1 0 0 0 14.1 14.5 12.5 360 12.0 16.0
12V power supply 12V POWER SUPPLY 0 1 1 1 0 0 12.0 n/a n/a n/a n/a n/a
24V NiCd, 18 cells 18 CELL NiCd 1 0 0 0 0 0 25.6 26.1 25.0 360 24.0 32.0
NiCd, 20 cells 20 CELL NiCd 1 0 0 1 0 0 28.2 29.0 25.0 360 24.0 32.0
Wet (vented) lead acid, 12 cells 24V WET LA 1 0 1 0 0 0 27.0 28.2 25.0 360 24.0 32.0
Calcium Calcium, 12 cells 24V CA/CA 1 0 1 1 0 0 27.6 31.2 25.0 360 24.0 32.0
Lead acid hybrid Sb-Ca, 12 cells 24V LA HYBRID 1 1 0 0 0 0 27.0 29.4 25.0 360 24.0 32.0
VRLA, AGM, 12 cells 24V VRLA - AGM 1 1 0 1 0 0 27.0 28.8 25.0 360 24.0 32.0
VRLA, Gel, 12 cells 24V VRLA - GEL 1 1 1 0 0 0 27.0 27.6 25.0 360 24.0 32.0
24V power supply 24V POWER SUPPLY 1 1 1 1 0 0 24.0 n/a n/a n/a n/a n/a
DIP switch 5: local / remote mode:
Local x x x x 0 0 Local mode, profile set by switches 1-4
Remote Auto Remote x x x x 1 0 Remote mode, profile set by LCD or PC
software. Default charge profile: ‘Auto’.
DIP switch 6: reserved
x x x x x 0 Default setting, do not adjust.

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 Configuration and Operation (cont.)
LED indication Normal charging: float and AutoBoost modes
In normal operation, the four circuit board LEDs indicate
operating status: fault conditions, charge mode, temperature At power-up, Sentinel displays an *******************
initial message that includes the unit * SENTINEL 300P *
compensation and AC supply: * V 3.0 *
firmware version, followed
*******************
LED operation Status
by...
on Fault condition (except AC supply &
Red battery connection errors). The default operating screen, 20/05/10 10:23
flashing, AC supply not available showing date, time, battery volts, VDC: 13.2 ADC: 8.5
slow (DC connected). charge current and charge mode.
FLOAT CHARGE
flashing, Battery connection error.
fast When Sentinel is in AutoBoost mode, the 4th
line changes to
show the current boost stage, displaying (in sequence)
off No fault conditions. ‘ramping to boost’, ‘boost extension’ and ‘boost decay’.

on In Float mode. Fault messages

Yellow When a fault condition occurs, an 20/05/10 10:23
flashing, In AutoBoost mode. appropriate message is shown on the VDC: 13.2 ADC: 8.5
slow display 3rd line. CHARGE FAIL
FLOAT CHARGE
flashing, In AutoBoost extension mode / boost
fast decay.
Fault messages automatically clear from the display when the
off Output off / output to nominal. fault condition clears. In the event of multiple faults, the 3rd line
displays the highest priority message, ranked in the following
on Temperature compensation active, order (highest priority first):
Blue sensor connected. • AC mains failure
flashing, Temperature compensation auto • DC connection error
slow disabled due to external fault. • Sensed connection error
flashing, Temperature compensation at absolute • Battery missing (detected during battery check routine)
fast limit, i.e. <–10ºC or >+50ºC. • Incorrect battery type (when configured with a 12V charge
off Temperature compensation disabled. profile, but the connected battery voltage is above 16.1 V).
• No battery detected (when configured with an ‘auto’ charge
profile, but the connected battery, or lack of connection, is
on AC supply available, charge output on. below 1.0V).
Green • High battery voltage
flashing, AC supply available, charge output off. • Charge fail
slow • Low battery voltage
flashing, Boost decay or battery missing • Volt sense level fault
fast (if red LED is also on).
Configuration mode
off AC supply not available.
The LCD and control keys can be used to view or change
configuration settings. The Sentinel 300P has three
configuration menus, named ‘Settings’, ‘System’ and ‘CAN’.
LCD Models While the operator is viewing or editing these menu settings,
Enclosed models ESNTL300PCL and ESNTL300PCLM Sentinel continues normal charge operation, but current
include a backlit graphic LCD, three push-button controls charging status or fault information is not displayed on the
LCD.
(Up, Down, Enter) and three additional indicating LEDs:
Settings menu
• Green: CAN network status (CAN-enabled models only). This sequence of screens allows viewing (but not editing) of
Lights continuously in normal CAN operation. several operating and device parameters.
• Yellow: charging mode, operation as yellow circuit board
To access the Settings menu, press SETTINGS
LED.
and hold the Up and Down keys. The FLOAT: XX.XVDC
• Red: fault conditions, operation as red circuit board LED. first screen displayed is: BOOST: XX.XVDC
BOOST EXT: XXX MINS
In normal charging mode, the LCD displays Sentinel and
battery status, e.g. operating mode, charge voltages and
currents, date/time, faults, etc. Press Up or Down keys to view more SETTINGS
settings: LOW ALARM: XX.XVDC
In configuration menu modes, the LCD and push-buttons HIGH ALARM: XX.XVDC
can be used by the operator to view/edit operating ALARM DELAY: XXX SEC
parameters and options (date/time, charge profiles, etc).
Press Up or Down keys to view more SETTINGS
settings: MODEL: XXXXXXXXX
SERIAL NO: XXXXXX
FIRMWARE: XXXXXXX

Press Up and Down to review the parameters again, or

press Enter to exit the Settings menu.

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 Configuration
Configurationand
andOperation
Operation (cont.)
(cont.)
System Menu
This passkey-protected menu allows the clearing of the Change Passkey
system log, the resetting of date/time and AC/charging hours Allows custom setting of the DD:MM:YY HH:MM
run, and (if DIP switch 6 is set to ‘remote’) the selection of a 4 digit System Menu SYSTEM MENU
charge profile. passkey. Press Enter to CHANGE PASSKEY?
To access the System menu, press and hold the Up and change (a series of four ENTER – YES DOWN - SKIP
Enter keys. screens, one for each
4 digit passkey entry. DD:MM:YY HH:MM passkey digit), or press
Use the Up or Down keys to SYSTEM MENU Down to skip this and move
change the first digit, press ENTER PASSKEY? X on to...
enter, then repeat for 2nd, UP & DOWN:CHANGE ENTER:OK
Select Charging Profile
3rd and 4th digits.
Allows the charge profile to DD:MM:YY HH:MM
Correct passkey entry (the factory default is 1234) allows be changed (but only if DIP SYSTEM MENU
viewing and editing of the following functions: switch 6 is set to 1/on/up: an SELECT CHARGE PROFILE?
error message results if ENTER – YES DOWN - SKIP
Date and time
switch 6 is set to 0/off/down.)
Press Enter to edit date and DD:MM:YY HH:MM
time (5 separate screens for SYSTEM MENU
Press Enter to change the
setting day, month, year, EDIT DATE & TIME? charge profile, which is
hours, minutes), or press ENTER – YES DOWN - SKIP selected on a following
screen; or press Down to
Down to skip (bypass) this
skip this and move on to...
section and move on to...
Confirm changes
Reset AC on hours
Sentinel stores data on the DD:MM:YY HH:MM Press Enter to confirm any DD:MM:YY HH:MM
number of hours it has been SYSTEM MENU System Menu changes and SYSTEM MENU
powered. Press Enter to RESET AC ON HOURS? exit. Press Down to discard CONFIRM CHANGES?
ENTER – YES DOWN - SKIP the changes and exit. ENTER – YES DOWN – CANCEL
reset this to zero, or press
Down to keep the existing CAN Menu
value and move on to...
On CAN-enabled units, this menu is reserved for
Reset Charging hours viewing/editing of the CAN network settings.
Sentinel stores data on the DD:MM:YY HH:MM
SYSTEM MENU
To access this menu, press and hold Down and Enter keys.
number of hours it has been
charging the battery. Press RESET CHARGING HOURS? The settings in this menu settings will vary according to part
Enter to reset this to zero, ENTER – YES DOWN - SKIP number specification: please contact your Murphy
representative for separate details or documentation.
or press Down to keep the
existing value and move on
to...

Maintenance, Fault Finding and Warranty

Maintenance and Warranty
Sentinel chargers are supplied with a 2-year warranty on
parts and workmanship.
Maintenance is limited to keeping the charger free from
ingress of dust, dirt or moisture, and ensuring clear air-flow
for ventilation.
In the event of an operating query or suspected fault, please
consult the sections in this manual on LED/LCD indication,
and the flowchart on page 12, or contact your supplier for
further advice before returning the charger.

WARNING: Except for AC fuse replacement,

Sentinel 300P battery chargers are not user-
serviceable.
In the event of a failure, the charger should be
returned to the supplier. No attempt should be
made to repair the charger. Any attempt to do
so may invalidate warranties, cause damage to
the charger and connected equipment, and
result in serious personal injury.

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 Maintenance, Fault Finding and Warranty (cont.)
Troubleshooting Flowchart:

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