Helios Power Solutions www.heliosps.com
Model Codes: SR100A …. Standard version
SR100D …. Standard with 2 relay alarm outputs
SR100L …. Standard with 3 relay alarm outputs
SR100P…. Standard with 2 alarms and internal output diode
AC/DC POWER SUPPLY & FLOAT CHARGER
FOR LEAD ACID BATTERIES
SR100A, D, L, P
User Manual
1/11/2017
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1. INTRODUCTION
The SR100L range is designed for use as a very accurate AC to DC power supply, or float charger
for lead acid batteries. Note that for float charging the output voltage must be set to approximately 15% above the nominal battery voltage. This is done as the default voltage for the 12V
model but must be specified at time of order for all higher voltage models.
2. CONNECTIONS
If used as a float charger always connect the positive output of the power supply to the positive
terminal of the battery. The charger may be permanently connected to float charge lead acid
batteries but it is essential to periodically check the electrolyte level of flooded cells as there is always some evaporation.
To minimize the volt drop at the output connections use all the terminals provided ie. connect output wires in parallel.
CONNECTION LAYOUTS
SR100L
AC INPUT
+ + - -
DC OUTPUT
ALARM VERSIONS
Relay contacts shown in de-energised state (ie. when there is a fault condition).
Alarm relays are energised when power supply is operating normally, eg. “Power” alarm relay is
energised when input voltage is present.
SR100D
SR100P.. with output diode.
(not avail. for 12 V output).
Note that the diode is in negative line. (tempco lead optional)
NC NO
COM
NC NO
POWER DC OK
+-+
-
AC INPUT
POWER
OK
DC OK
TEMPCO
LEAD
COM
PSU
OUTPUT
DIODE
Optional temperature
compensation sensor lead
incl. SR100D, SR100P, SR100L
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3.0. LED INDICATION CODES
3.1 -D version
Power: On = ac input present
Off = no input or short circuit on output
DC OK: Steady on = DC output OK
Slow flash = DC output low or battery low (eg. 11, 22, 33, 44V)
3.2 -L Alarm version
Power: On = ac input present
Off = no input or short circuit on output
DC OK : Steady on = DC output OK
Slow flash = DC output low or battery low (eg. 11, 22, 33, 44V)
Fast flash = DC high (1.2xVnom for PSU, 2.5V/cell for charger, unless otherwise
specified)
4.0 FG - Frame Ground
Where provided, this terminal provides a connection to the metal case for an earthing-
point.
SR100L (tempco optional)
NC NC
POWER DC OK
LOAD OUTPUT
+ - + -
AC INPUT
POWER
OK
DC OK
TEMPCO
LEAD
DC HIGH
FG NC NO
COM
NO NO
COM COM
incl. SR100D, SR100P, SR100L
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Industrial quality AC/DC power supply
Suitable for float charging of lead acid batteries
Constant current limit
Precise voltage control
Efficient modern ‘current-mode’ topology
Temperature compensation option
Suitable for parallel operation
Optional relay alarm outputs - model SR100D,P
Optional serial communications port, SR100L
ISO9001 design management system
PHYSICAL
AC Input connector
DC Connections
Enclosure
Indicators
Weight
Dimensions
ENVIRONMENTAL
Operating temperature
Storage temperature
Humidity
Cooling
24 Month Warranty
STANDARDS
EMI
Safety
incl. SR100D, SR100P, SR100L
IEC320 inlet socket (similar to PCs etc.)
Plug-in style socket & mating screw terminal block: (max. wire 2.5mm² / way)
Zinc plated steel /powder coated lid
Green LED for DC Power OK
0.94 Kg
146.5 W x 62 H x 177 D mm
Input
Fusing / Protection
Isolation
Efficiency
Inrush current
Output Power
Output Voltages
(nominal)
Voltage adj. range
Temp. Compensation
(option)
Over current Protection
Line Regulation
Load Regulation
Noise
Transient response
Hold-up time
ELECTRICAL
180V - 264VAC 45-65Hz or 200 - 375V DC
(standard)
88V - 132VAC 45-65Hz or 110-180VDC (on
request)
Internal AC input fuse
1KV DC input - output / earth
> 85%
<30A, 1.8ms
100W Continuous (0 - 50°C)
13.8V, 24V, 36V, 48V
Other voltages by request.
85 - 115% of Vout
Temperature sensor on 1.7m lead with
adhesive pad: -4mV / °C / cell ±10%
Constant current limit under overload and
short circuit conditions
<0.04% over input range
<0.5% open circuit to 100% load
<0.3%
200mV over/ undershoot,
load step 20-100%, 400us settling time
15 - 20 ms (nom. - max. Vin) without
battery
Standard: 0 to 50 °C ambient at full load
Option - Low temp: -20 to 50 °C ambient
at full load, add suffix -LT
De-rate linearly >50 °C to 0 load @ 70 °C
-20 to 85 °C ambient
0 - 95% relative humidity non-condensing
Natural convection
to CISPR 22 / EN55022 class A
to IEC60950 / EN60950 / AS/NZS3260
ACCESSORIES SUPPLIED
Mounting Feet together with screws
AC power cord Standard 1.5m lead with IEC320 socket / local plug
DC connectors with mating screw-terminal plug
Ideal as a Standby Float Charger
for lead acid batteries
SPECIFICATIONS All specifications are typical at nominal input, full load and at 20°C unless otherwise stated.
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100 Watt
AC/DC Stand Alone Power Supply/Float Charger
CABINET OPTIONS
19”Rack mount
Wall Mount Cabinet
2U sub rack option: add SR-RM2U
May be fitted into a cabinet which includes
two MCBs and I/O terminals
Cabinet code: SEC-SR
OPTIONAL COMMUNICATION PORT
ELECTRICAL OPTIONS
Temperature
Compensation
Alarms : SR100D
SR100L
Alarm Relay Contacts
Parallel Redundancy
For accurate battery charging, temperature
compensation adjusts voltages in accordance with external temperature probe
Order Code: +TEMPCO
Mains fail
DC low (Battery low or PSU low)
- Charger: set at 1.83V/cell (80% Vout)
- PSU: set at 83% V out
As SR100D plus extra DC alarm and op-
tional comms port
C - NO - NC changeover, rated
30VDC,2A /110VDC,0.3A/125VAC,0.5A
Use output diode for N+1 redundancy
24V & above: SR100P with alarms and
internal diode
12V: use SR100D12.. and +P15 external
diode
MODELS
Power Supply Battery Charger*
Adjustable
range (V)
Output
Volts
(factory
default)
Output
Current (A)
(continuous)
Output
Volts*
(Charging)
Output
Current (A)
(Charging)
SR100L12
13.8 7.3 13.8 7.3 11-14
SR100L24
24 4.2 27.6 3.6 22-28
SR100L30
30 3.3 34.5 2.9 27-33
SR100L36
36 2.8 41.4 2.6 34-43
SR100L48
48 2.1 55.2 1.8 45-57
STANDARD MODEL TABLE
Standard version does not
have temperature sensor
Available on SR100L… models:
Three comms. options available: RS485, RS232,
Ethernet
With three relay alarm outputs
Optional MODBUS protocol converter
MODEL CODING
230V AC no switch = blank
110V AC no switch = G
Input voltage and front Panel standby
switch
Phoenix combicon (plug in screw terminal block) = X Output DC connector
Yes = T No = blank
Temperature Compensation
12, 24, 30, 36, 48 DC output: Nominal voltage
A = Standard
D = A with two alarms
P = D with internal output diode
L = D with extra alarm and optional comms port if required
Function
485 = RS485 232 = RS232 LAN = ETHERNET
(for SR100L… versions only)
Optional Communications
Interface Port
Power 100W
SR100L12TXG-485
Optional Protocol
Converter
*Please specify on ordering
if unit is to be used for battery charging duty (except
for 12V version which is set
for 13.8V as standard)
incl. SR100D, SR100P, SR100L
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Two or more SRxxx series power supplies may be connected in parallel for increased power (with or without
diodes). It is essential that the wiring from each unit to the load is kept identical for equal power sharing
particularly when diodes are not used.
Two or more SRxxx D series power supplies (standard PSU with alarms), may be connected in parallel for N+1
redundancy using output diodes shown.
Diodes can be fitted inside some power supplies (see models listed below).
The SRxxx P series identifies when an internal diode is fitted in the power supply.
CONNECTION FOR PARALLEL REDUNDANCY
INTERNAL diodes can be fitted to the following models only (diode is fitted in negative
line):
100W: SR100P24, SR100P36,
SR100P48
250W: SR250P24, SR250P30, SR250P36,
SR250P48, SR250P60
All other models have diodes external to the
power supply, eg fitted into a 2U rack as
shown in the photo to the right.
2U rack with 2 x SR250D12 power
supplies and decoupling diodes on
heatsink plus V/I meter
-
+ +
-
SRxxxP
SRxxxP SRxxxD
SRxxxD
ALARMS
ALARMS ALARMS
ALARMS
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Safety
The user is responsible for ensuring that input and output wiring segregation complies with local standards and
that in the use of the equipment, access is confined to operators and service personnel. A low resistance
earth connection is essential to ensure safety and additionally, satisfactory EMI suppression (see below).
HAZARDOUS VOLTAGES EXIST WITHIN A POWER SUPPLY ENCLOSURE AND ANY REPAIRS MUST BE CAR-
RIED OUT BY A QUALIFIED SERVICEPERSON.
Electrical Strength Tests
Components within the power supply responsible for providing the safety barrier between input and output
are constructed to provide electrical isolation as required by the relevant standard. However EMI filtering
components could be damaged as result of excessively long high voltage tests between input, output and
ground. Please contact our technicians for advice regarding electric strength tests.
Earth Leakage
Where fitted, EMI suppression circuits cause earth leakage currents which may be to a maximum of 3.5mA.
Ventilation
High operating temperature is a major cause of power supply failures, for example, a 10oC rise in the operating temperature of a component will halve its expected life. Therefore always ensure that there is adequate
ventilation for the equipment. Batteries in particular suffer shortened lifetimes if subjected to high ambient
temperatures.
Water / Dust
Every effort must be made in the installation to minimise the risk of ingress of water or dust. Water will almost
always cause instant failure. The effects of dust are slower in causing failure of electronic equipment but all
electrical equipment should be cleaned free of any dust accumulation at regular intervals.
Electromagnetic Interference (EMI)
Switching power supplies and converters inherently generate electrical noise. All wiring should be as short as
practicable and segregated from all equipment wiring which is sensitive to EMI. Residual noise can be reduced by looping DC wiring through ferrite cores (sleeves). These are most effective as close to the power
supply as possible and as many turns of the wire taken through the core (+ and - in the same direction) as the
core will accommodate.
External fuse protection
Fuses or circuit breakers must be used in all battery circuits to protect against short circuits. External fuses
should be used for power supplies/ chargers even though they are usually internally protected.
Connection polarity
It is critical to check the polarity carefully when connecting DC devices. Some Innovative Energies models
have non-destructive reverse polarity protection but usually a reverse polarity connection will result in a blown
fuse or serious damage to the device.
Glossary of terms used in our user manuals
PSU = power supply unit BCT = battery condition test ECB = electronic circuit breaker
ELVD = electronic low voltage disconnect RPP = reverse polarity protection EMI = electromagnetic interference
SNMP = Simple Network Management
Protocol
LAN = local area network DOD = depth of discharge
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TERMS OF WARRANTY
Helios Power Solutions warrants this product for 24 months from date of shipment against material and workmanship defects. Liability under this warranty is limited to the replacement or repair of the defective product
as long as the product has not been damaged through misapplication, negligence, or unauthorized modification or repair.
CUSTOMISED VERSIONS
MODEL CODE BASE MODEL SPECIAL FEATURES
CSR117 SR100A12TX
Operating temp. range -40 to +50°C, temp. compensation disabled below -20°C, conformal coated PCB
SR100L24TX/1 SR100L24TX Tempco length 4m
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