Helios Power Solutions - Auckland: +64 9 8350700 - Sydney: +61 2 9809 5022 - Singapore: +65 6871 4140 - www.heliosps.com
User Manual
SR250A/D/L/LP
AC/DC power supply/charger with optional communications port
250W
16/09/2016
Please refer to separate user manual for full SNMP instructions for SR250L and SR250LP models
Refer to last page for customised model codes.
Model Codes: SR250A
SR250D
SR250L
SR250P
SR250LP
= Basic version
= with mains fail and dc low alarms
= with mains fail, dc low, dc high alarms
= with output diode (24V & above) and “D” alarms
= with output diode (24V & above) and “L” alarms
Specifications are subject to change without notice. No liability accepted for errors or omissions. 2
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 CARRIED 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 even with models which have non-destructive
reverse polarity protection.
PSU = pow er su pply u nit BCT = bat tery condition test ECB = electronic circ uit b reaker
ELVD = elect ron ic l ow voltage di scon-
nect
RPP = rev er se po larit y prot ecti on EMI = electro magnetic interference
Glossary of terms used in our user manuals
SNMP = Simple Network Management
Protocol
LAN = local area netw ork DOD = dep th of discharge
Specifications are subject to change without notice. No liability accepted for errors or omissions. 3
The SR250A/D/L/LP is a AC/ DC power supply or can be used as a float charger for lead acid batteries.
Model codes SR250L and SR250LP are available with optional communication ports as follows:
TERMINAL LAYOUT (SR250L.. & SR250LP.. models shown)
It is recommended that all four terminals (2 positive + 2 negative, as shown in the diagram above) are used
when plug in/screw terminals are fitted for the 12V model)
FG - Frame Ground
This terminal provides a connection to the metal case for an earthing point.
Ethernet Web pages + SNMP
RS232 Innovative Energies ASCII code
RS485 Modbus serial or TCP/IP with external Modbus pro-
tocol converter
Type of port Protocol Model
SR250L/LP.-LAN+
SR250L/LP 232
SR250L/LP 485
SR250L/LP -LAN Ethernet Innovative Energies ASCII code
Specifications are subject to change without notice. No liability accepted for errors or omissions. 4
Power OK: On = Input power 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)
LED INDICATION CODES
PARALLEL CONNECTION
Two or more SR250L power supplies may be connected in parallel, with or without diodes for increased pow-
er, or with output diodes for N+1 redundancy.
Although batteries are not essential it is recommended that they be used so that the communications continue working in the event of an input power / internal converter failure.
Specifications are subject to change without notice. No liability accepted for errors or omissions. 5
Built in output diodes for 24V and higher models
(optional communication port shown)
Specifications are subject to change without notice. No liability accepted for errors or omissions. 6
Isolated input to output
LED indication and standby (off) button
Optional communication port
Option of RS232, RS485, Ethernet
Option of ASCII, Modbus, SNMP
Three relay alarm outputs
Industrial quality AC/DC power supply
Suitable for float charging of lead acid batteries
Constant current limit
Precise voltage control
Temperature compensated output (optional)
Suitable for parallel operation
ISO9001 design management system
PHYSICAL
AC input connector
DC Connections
Enclosure
Dimensions
Weight
Indication LEDs
Alarm relay contacts
Standby Mode
ENVIRONMENTAL
Operating
temperature
Storage temperature
Humidity
Cooling
♦ 24 Month Warranty
STANDARDS
EMI
Safety
IEC320 socket
M6 brass studs or plug-in socket with screw
terminals
Zinc plated steel /powder coated lid
150W x 61H x 242D (excl. terminals)
1.7 Kg
Standard: Power OK, Standby
With alarms: DC OK, Power OK, Standby
C - NO - NC changeover rated 1A /50V DC,
32VAC
Turns off DC output of PSU
Input ▪ standard
▪ option
Fusing
Overcurrent protection
OVP
Thermal protection
Isolation
Efficiency
Inrush current
Output power
Output voltages
Voltage adj. range
Line regulation
Load regulation
Noise
Drift
Hold-up time
ELECTRICAL
180-264 or 88-132V, 45-65Hz (internal link
select)
88 - 135VDC
Input fuse
Constant current limit under overload and
short circuit conditions
Over-voltage protection on output
at ~ 130% of nominal output voltage
Yes, self resetting
1KV DC input - output / earth
> 85%
Soft start circuit
250W
Refer to model table
85 - 115% of Vout
<0.2% over input range
<0.4% open circuit to 100% load
<1%
0.03% / °C
15 - 20 ms without battery
0 - 50 °C ambient at full load
De-rate linearly >50 °C to no load @ 70 °C
-10 to 85 °C ambient
0 - 95% relative humidity non-condensing
24V & above: convection
12V: fan cooled
To CISPR 22 / EN55022 class A
To IEC950 / EN60950 / AS/NZS3260
ACCESSORIES SUPPLIED
Mounting feet together with screws
AC power cord 1.5m with IEC320 socket and NZ/Aust plug
Mating screw-terminal plug for alarm outputs
Crimp lugs for stud terminal versions
DC screw terminal plug-in connector for ‘X’ version
SPECIFICATIONS All specifications are typical at nominal input, full load and at 20°C unless otherwise stated.
AC/DC power supply with 3 alarm relays and optional communication port
SR250L/LP sho wn
16/09/2016
Specifications are subject to change without notice. No liability accepted for errors or omissions. 7
OPTIONS
Temperature
compensated charging
Alarms:
Alarm Relay Contacts
Internal output diode
(SR250LP..)
Earth Fault Alarm
-4mV / °C / cell , sensor lead length 1.7m
Order Code: +TEMPCO
Mains fail (or PSU in s tan db y mod e)
DC low (Battery low or PSU low) - set at
92% of nominal voltage.
Special version available: Battery low
alarm operates when mains power is on,
order code: SFMCT-OA v1.1
• DC high
C - NO - NC full changeover rated 1A /50V
DC, 32VAC
Incl. alarms & output diode for N+1 redundancy, internal diode not available for 12V mod-
els.
Using an external alarm card (see separate
data sheet)
MODELS
Power Supply Battery Charger
Adjustable
range (V)
Output
Volts
(factory default)
Output
Current (A)
(continuous)
Output
Volts*
(Charging)
Output
Current (A)
(Charging)
SR250A12
13.8 18.1 13.8 18.1 11-14
SR250A24
24 10.4 27.6 9.0 22-28
SR250A30
30 8.3 34.5 7.2 28-36
SR250A36
36 6.9 41.4 6.0 34-43
SR250A48
48 5.2 55.2 4.5 45-57
SR250A7.5
7.5 20 6.9 20 (140W) 6.8-8
SR250A60
60 4.1 69.0 3.6 54-69
STANDARD MODEL TABLE
* Please specify on ordering if the
unit is to be used for float charging
(except for 12V model which is set
at 13.8V by default).
MODEL IDENTIFICATION CODES
L = 230V AC + sw itch Blank = 230V AC no switch
U = 110V AC + sw itch G = 110V AC no sw itch
H = 110V DC + sw itc h J = 110V DC n o s wit ch
Input voltage and front
panel standby switch
S = Stud X = Plu g in /scr ew t erm inal b lock
F = Fan Blank = No fan
T = Yes Blank = No
12, 24, 30, 36, 48, 60
Output DC Connector type:
Fan cooled:
Temperature Compensation
DC output: Nominal voltage
Function
Optional communication
port
Power
250W
250 Watt
AC/DC Stand Alone Power Supply/Float Charger
485 = RS485 232 = RS232
LAN + = Ethe rnet (SNMP) LAN = Et hern et (A SCII)
Communication port
Protocols
Digital V/I meter
19”rack mount
Wall Mount Enclosure
Choice of RS485, RS232, Ethernet
Note: Requires external battery for communications to continue working when there is a loss
of input power.
• SNMP v1
• Modbus (external conv ert er)
Serial: +PROTOCONMB
TCP & HTTP: +PROTOCONMB-OE
May be fitted with SR250 in 19” rack,
add: SR-METER or SR-METERV2/SHUNT
Single charger add: SR-RM2U
Dual charger (front removable) add:
SR-RM2U-DUALV2
Charger may be fitted into enclosure with
MCBs and terminals. Code: SEC-SR
OPTIONS (cont.)
A = Basic version
D = with mains fail and dc low alarms
L = with mains fail, dc low, dc high alarms
P = with output diode (24V & above) and “D” alarms
LP = with output diode (24V & above) and “L” alarms
Helios Power Solutions - Auckland: +64 9 8350700 - Sydney: +61 2 9809 5022 - Singapore: +65 6871 4140 - www.heliosps.com
TERMS OF WARRANTY
Helios Power Solutions Ltd 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 OF SR250i?.
Model code BASE MODEL SPECIAL FEATURES
CSR112 SR250L24TXL-LAN+ 5M Tempco cable
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