Helios SR250C User manual

Helios Power Solutions - Auckland: [phone] - Sydney: [phone] - Singapore: [phone] - www.heliosps.com
SR500C / SR750C (with
optional V/I meter shown)
SR250C
User Manual
SR250C/SR500C/SR750C
No-BreakTM DC UPS
15/09/2016
REFER TO BACK PAGE FOR CUSTOMISED MODELS

Specifications are subject to change without notice. No liability accepted for errors or omissions. 2
Safety
The user is responsib e for ensuring that input and output wiring segregation comp ies with oca standards and that in
the use of the equipment, access is confined to operators and service personne . A ow resistance earth connection is
essentia to ensure safety and additiona y, satisfactory EMI suppression (see be ow).
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 supp y responsib e for providing the safety barrier between input and output are construct-
ed to provide e ectrica iso ation as required by the re evant standard. However EMI fi tering components cou d be dam-
aged as resu t of excessive y ong high vo tage tests between input, output and ground. P ease contact our technicians
for advice regarding e ectric strength tests.
Earth Leakage
Where fitted, EMI suppression circuits cause earth eakage currents which may be to a maximum of 3.5mA.
Ventilation
High operating temperature is a major cause of power supp y fai ures, for examp e, a 10oC rise in the operating tempera-
ture of a component wi ha ve its expected ife. Therefore a ways ensure that there is adequate venti ation for the
equipment. Batteries in particu ar suffer shortened ifetimes if subjected to high ambient temperatures.
Water / Dust
Every effort must be made in the insta ation to minimise the risk of ingress of water or dust. Water wi a most a ways
cause instant fai ure. The effects of dust are s ower in causing fai ure of e ectronic equipment but a e ectrica equip-
ment shou d be c eaned free of any dust accumu ation at regu ar interva s.
Electromagnetic Interference (EMI)
Switching power supp ies and converters inherent y generate e ectrica noise. A wiring shou d be as short as practica-
b e and segregated from a equipment wiring which is sensitive to EMI. Residua noise can be reduced by ooping DC
wiring through ferrite cores (s eeves). These are most effective as c ose to the power supp y as possib e and as many
turns of the wire taken through the core (+ and - in the same direction) as the core wi accommodate.
External fuse rotection
Fuses or circuit breakers must be used in a battery circuits to protect against short circuits. Externa fuses shou d be
used for power supp ies/ chargers even though they are usua y interna y protected.
Connection olarity
It is critica to check the po arity carefu y when connecting DC devices even with mode s which have non-destructive
reverse po arity protection.
PSU = power supp y unit BCT = battery condition test ECB = e ectronic circuit breaker
ELVD = e ectronic ow vo tage discon-
nect
RPP = reverse po arity protection EMI = e ectromagnetic interference
Glossary of terms used in our user manuals
SNMP = Simp e Network Management
Protoco
LAN = oca area network DOD = depth of discharge

Specifications are subject to change without notice. No liability accepted for errors or omissions. 3
No-Break™ SYSTEM BLOCK DIAGRAM
The No-Break™ DC power supply is designed to provide DC power and charge lead acid batteries for
critical back up applications.
No-Break™ DC systems ensure maximum uptime of the system, and life of the battery, by providing:
♦ Accurately regulated output voltage
♦ Constant current limited output
♦ onitoring of the battery status and battery circuit integrity
♦ Fast electronic battery overcurrent protection
♦ Deep discharge protection by disconnecting the load at low battery voltage.
♦ Temperature compensated output voltage using external temperature sensor
♦ Alarm contacts for fault monitoring
♦ Adjustable battery charge current limit
♦ Battery condition testing (BCT) - optional on “C” models, standard on “I” models which have a com-
munication interface
Option l fe tures:
♦ Communication interfaces, serial (RS232, RS485) or ethernet to enable remote monitoring of the
power supply and control of the battery condition test function
♦ odbus and SN P protocols
♦ Internal V/I meters on 500W and 750W
MAINS FAI
A ARM

Specifications are subject to change without notice. No liability accepted for errors or omissions. 4
#1. 1 x No-Break™DC charger and 1 x batter bank
This is the basic connection which is most commonly used, and provides
adequate protection for the ma ority of systems requiring DC back up in
the event of a mains power failure.
Power OK YES
Battery Missing YES
Battery ow YES
Battery Condition Test Fail YES
Alarms Available
Single battery DC
UPS
#3. 1+1 redundanc using two No-Break™DC
chargers and two batter banks
Power OK YES
Battery Missing YES
Battery ow YES
Battery Condition Test Fail YES
Alarms Available
#2. Peak load connection using 1 x No-Break™DC
charger
Use this connection when there is a connected load with a peak current
likely to exceed 1.5 times the rated current of the charger. Standing
loads are connected normally and an optional external low voltage dis-
connect may be used for the peak load.
Power OK YES
Battery Missing YES
Battery ow YES
Battery Condition Test Fail YES
Alarms Available
Power OK YES
Battery missing YES
Battery low YES
Battery condition test fail YES
Alarms available
#4 1+1 redundanc for s stems with high peak loads
For super critical ap-
plications
DC UPS for high peak
loads

Specifications are subject to change without notice. No liability accepted for errors or omissions. 5
CONNECTION PROCEDURE
1 Check input and output voltages of system, ensure that they match the equipment.
2 Connect battery /batteries to BATTERY + and BATTERY - terminals. Although there is built in reverse
polarity protection, under some circumstances reverse polarity connection will not only result in the
rupture of the internal battery protection fuse but destroy the input circuitry of the unit.
3 The ECB and battery circuit may be tested at this point. To close the ECB with no mains power pre-
sent, briefly short together the BATTERY –ve and LOAD –ve terminals. The battery voltage will
then appear at the load terminals, BATT LOW relay energises & BATT SYSTEM OK LED turns on. The
POWER OK LED stays on for about 30s. Disconnect one battery lead briefly to open the ECB.
4 Connect load/s to LOAD+ and LOAD- terminals.
5 To minimize the volt drop at the output connections always use all the terminals provided by linking
them together.
6 Place temperature sensor probe near or on batteries.
7 Connect input power. Charger should be fully operational at this stage.
ALARM & BCT RELAYS
Relay contacts shown in de-energised state (ie. when there is a fault condition).
Alarm relays are energised when power supply is operating normally. BCT relay is energised when battery
condition test is in progress.
OUTPUT FUSES/ MCB RATING
The battery circuit is the one which has the highest fault current potential and fuses/ CBs should be correctly
rated for the wiring used.
FRONT PANEL LEDS (with built-in switches)
BATTERY SYSTEM OK: LED on: Battery present and above V batl.
Note: If the battery condition test function is enabled, pushing this switch
for approx. 2 sec will manually initiate a battery condition test.
POWER OK: LED on: Input power present
LED off: No input power or charger in standby mode
STANDBY: LED on: Charger in standby mode (no output from charger)
Note: Push standby button to turn off charger, this allows load to run off bat
tery. Push button again to turn on charger.
AUX
(BCT)
MAINS FAIL
(POWER OK)
BATTERY LOW
(BATT SYS OK)
COM NC NO COM NC NO COM NC NO
FG
ALARMS (refer to specific data sheets for operational details)
POWER OK: Approx. 30 second delay before activation.
BATTSYS OK: Battery detection alarm my take up to 60 minutes to activate during normal operation

Specifications are subject to change without notice. No liability accepted for errors or omissions. 6
*1 This a arm operates on y when no input vo tage present.
Parameter Default Settings Special
Setting
V nomin l 12 24 30 36 48
V output (20°C) 13.8 27.6 34.5 41.4 55.2
B tDetect (mins) 60 60 60 60 60
Vpres 12.2 24.4 30.5 36.6 48.8
Vb tl *1 11 22 27.5 33 44
Vshutd: 11.5 23 28.7 34.5 46
Vdisco: 10 20 25 30 40
Bccl (%) 100 100 100 100 100
Comms
BCTim (mins) 20 20 20 20 20
Time between BCT (d ys) 28 28 28 28 28
CC Mins: 40 40 40 40 40
CC Hrs: 23 23 23 23 23
CC D ys: 27 27 27 27 27
MfiBCT: 30 30 30 30 30
Allow retest fter BCT f il Yes Yes Yes Yes Yes
T mf (hours) 4 4 4 4 4
T mfb (mins) 5 5 5 5 5
Scheduled BCT Optional (no unless specified)
SNMP VERSIONS ONLY:
Al rm m sk Refer to SN P user manual
DHCP Disabled, IP address = 192.168.2.10
Explanation of Terms:
B tDetect: Time between battery detections
Vpres: Voltage threshold for battery detection and BCT. Note that if the voltage drops to
this level during a BCT the test is aborted and the BAT LOW/SYS alarm shows.
Vshutd: Internal voltage level of the power supply during battery detection and battery
condition tests.
Vb tl: BAT LOW alarm voltage level
Vdisco: Voltage at which the load is disconnected from the battery during mains fail
Bccl: Battery charge current limit as percentage of the rated power supply current
Comms (only on
-i versions)
Communication mode of PSU: F = continuous data stream of status
= responds only to request made by a controller
BCTim: Length of battery condition test
CC Mins: Time in minutes between automatically scheduled BCTs
CC Hrs: Time in hours between automatically scheduled BCTs
CC D ys: Time in days between automatically scheduled BCTs
Note: The total time interval between battery condition tests (BCTs) is the sum total of the three 'CC'
MFiBCT: Time in minutes before the mains fail check during the BCT (SR100 only)
T mf ax. time of a mains fail without resetting to full BCT interval
T mfb ax. time of mains fail before BCT is discontinued

Specifications are subject to change without notice. No liability accepted for errors or omissions. 7
B ttery condition test (BCT)
An internal jumper must be fitted to enable the automatic battery condition test function. If this jumper is
fitted the battery condition test function may also be initiated manually by pushing the BATT SYS OK but-
ton for approx. 2 seconds.
B ttery Condition Test F il Reset
If the system fails the BCT the BATT SYS OK LED continues flashing and the BATT LOW alarm latches
until either both the mains power input and the battery are disconnected briefly, or the system passes
the next BCT.
Battery
System OK
LED
Power OK
LED
Power
Stand-by
LED
Battery
System
OK Alarm
Power OK
Alarm Condition
Normal Normal System Normal: Input power on, battery circuit is OK
Normal Normal Battery detection in progress
Alarm Normal
Input power on, battery system fault:
1. Internal battery fuse has opened or
2. Battery circuit wiring open circuit, battery missing, ECB has tripped
Normal Alarm Input power off, battery system is OK (battery volts > Vbatl)
Alarm Alarm Input power off and battery has discharged to < V batl
Alarm Alarm Input power off, ELVD has activated and disconnected battery from load.
Normal Normal PSU in standby, input power on, battery system OK
Alarm Alarm
PSU is in standby and battery has discharged to < Battery Low, unit will continue
delivering battery current until next level initiates ELVD.
Alarm Alarm PSU is in standby and ELVD has activated and disconnected battery from load.
Normal Normal BCT in progress
Alarm Normal Input power on, BCT failed (battery voltage < Vpres during BCT)
LEGEND : =Off =fast flash
=On =slow flash
LED FLASH CODES

Specifications are subject to change without notice. No liability accepted for errors or omissions. 8
SR250 CONNECTION LAYOUT
(Plug in/screw terminals)
AC INPU
+ - + -
LOAD BATT
ALARMS
AC INPU
ALARMS
SR250 CONNECTION LAYOUT
(Stud terminals)
+ COM LOAD- BATT-
AC INPUT
ALARMS
SR500/750 CONNECTION LAYOUT
Stud terminals)
+ COM LOAD- BATT-
NOTE: LOAD+ / BATT+ termina s
are inked interna y and are connect-
ed to the +COM termina on the stud
connection versions.
OPERA ION OF ELEC RONIC CIRCUI BREAKER (ECB) FOR PRO EC ION OF CHARGER & BA ERY WIRING
The ECB will operate on overcurrent as above & is also activated for the low voltage disconnect function on
mains fail (no input power). It will reset when input power is restored, or can be manually reset by briefly
shorting the BAT- and LOAD- terminals together when there is no input power.
Max. allowable
load amps
(x I rated)
8
7
2.5
2ms 300ms ime
8
6
2ms 300ms ime
6x I rated
for 300ms max.
INPUT POWER ON
ECB automatically resets IPSU = 1x I rated
IBAT = 1.5x I rated
ECB trips & latches off
until input power is
restored
IPSU = 0
IBAT = 1.5x I rated
7x I rated for
300ms max.
Short circuit condition,
ECB trips within 2ms
INPUT POWER OFF
1.5 x I rated until LV
disconnect operates
Short circuit condition,
ECB trips within 2ms
Max. allowable
load amps
(x I rated)
1.5
CONNEC ION LAYOU S
2.5 x I rated peak
current allowed

Specifications are subject to change without notice. No liability accepted for errors or omissions. 9
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Specifications are subject to change without notice. No liability accepted for errors or omissions. 10
 High performance DC UPS s stem
 No-Break switching between charger & batter
 Batter detection - regular batter presence and
batter circuit integrit checks
 Alarm rela outputs
 LED flash codes for precise state indication
 Deep discharge protection for batteries
 ECB for batter overload & short circuit protection
 Fused reverse batter polarit protection
 Automatic temperature compensated output volts
 Option - batter condition test (BCT)
 Option - communication interface allows remote
monitoring & user control of BCT function - i ver-
sions
 Batteries external to charger - order separatel
ENVIRONMEN AL
Operating
temperature
Storage temperature
Humidity
Cooling
Protection
♦ 24 Month Warranty
Input voltage
Fusing / protection
Isolation
Efficiency
Inrush current
Output power
Output voltage
Voltage adj. range
emp. compensation
Current limit
Line regulation
Load regulation
Noise
Drift
Hold-up time
urn on time
hermal protection
Overvoltage protection
EMI
Safety
Vibration
ELEC RICAL
180 - 264V, 50/60 Hz (standard)
or 88 - 132VAC (internal link selectable)
5A input fuse and varistor
Battery fuse plus ECB for battery circuit
1KV DC input - output / earth
> 85%
Soft start circuit
250W
13.8, 27.6, 34.5, 41.4, 55.2VDC
85 - 105% of Vout
Temperature sensor on 1.7m lead with adhe-
sive pad: -4mV / °C / cell ±10%
PSU: 100% rated current
Battery: 25-100% rated current (factory set)
<0.2% over AC input range
<0.4% open circuit to 100% load
<1% output voltage
0.03% / °C
20 ms without battery (nominal - max. Vin)
< 1 sec
Yes, self-resetting
Over-voltage protection on output
at ~ 130% of nominal output voltage
CISPR 22 / EN55022 class A
IEC950 / EN60950 / AS/NZS3260
Designed to meet MIL-STD-810F Method
514.5
-20 to 50 °C ambient at full load
De-rate linearly at >50 °C to zero @ 70 °C
-30 to 85 °C ambient
0 - 95% relative humidity non-condensing
Natural convection except for 12V model (fan)
IP20
No-Break™ FUNC IONS AND ALARMS
Reverse polarity pro-
tection
Battery monitoring
Battery protection
- low battery volts
- overload
- short circuit
Indication LEDs
Alarms
Alarm relay contacts
Standby mode
Battery condition test
(BC )
Battery reverse connection will open internal
fuse (and produce alarm)
Detects for presence of battery on start up,
then every 60 minutes when charge current <
200mA
Electronic circuit breaker (ECB) operates
under the following conditions:
• battery voltage drops to 1.67V/cell -
auto reset
• < 300ms for load > 6 x rated PSU cur-
rent, allows ~1.5x rated PSU current
from battery without acting,
• < 2ms, backed up by fuse
Green: Battery System OK, Power OK
Red: Standby
• Power OK (alarm on mains fail)
• Battery System OK - alarms when battery
voltage low (on mains fail) , battery
missing, battery circuit wiring faulty, BCT
fail (if enabled)
C - NO - NC full changeover rated 1A /50V
DC, 32VAC
Turns off DC output of PSU & allows load to
run off battery
Optional - if enabled, default setting =
20mins/28days). BCT can be started and
stopped by the user on SR250 i. BCT relay
provided to control an external test load.
incl. S 250i
SPECIFICATIONS All specifications are typical at nominal input, full load and at 20°C unless otherwise stated.

Specifications are subject to change without notice. No liability accepted for errors or omissions. 11
PHYSICAL DE AILS
AC input connector
DC output connec-
tions
Alarm connections
Enclosure
Weight
Dimensions
IEC320 input socket (included)
M6 brass stud or plug-in style socket & mating
screw terminal block:
Plug in screw terminal block
Powder coated & zinc plated steel
1.7kg
150W x 242D x 61H mm (excluding mounting
feet and connections)
OP IONS
Communications Port
(SR250i...)
Digital V/I meter
19”rack mount
Wall Mount Enclosure
• Ethernet / SNMP v1
• RS485 / Modbus using external converter:
∗ +PRO OCONMB - Modbus serial
∗ +PRO OCONMB-OE - Modbus TCP
& HTTP
• RS232 / IE ASCII code
May be fitted with SR250 in 19” rack,
add: SR-ME ER or SR-ME ERV2/SHUN
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
DC Output
Output (V)
PSU Rated
(A)
Charge
Limit (A) *1
Recomm. Av.
Load (A)
Peak load on
mains fail (A)
SR250C12 13.8 18.0 18.0 12.0 27
SR250C24 27.6 9.0 9.0 5.0 13.5
SR250C30 34.5 7.2 7.2 3.7 10.8
SR250C36 41.4 6.0 6.0 3.0 9
SR250C48 55.2 4.5 4.5 2.0 6.7
MODELS
MODEL ABLE (ratings apply to all variants)
MODEL IDEN IFICA ION CODES
SR 50i (please refer to separate
data sheet on comms options)
250 Watt
No-Break™ DC charger for lead acid batteries
Optional Communications
Interface Port
incl. S 250i
L = 230V AC + sw itch Blank = 230V AC no switch
U = 110V AC + sw itch G = 110V AC no switch
H = 110V C + switch J = 110V C no switch
M = 230V AC + switch + (to be used with IEOVPHVAC)
Input voltage and front
Panel standby switch
C = No-Break™ C PSU/charger
i = C with serial or ethernet communications port
Function
Power 250W
For SR250i versions:
485 = RS485 232 = RS232 LAN = Ethernet (ASCII)
LAN+ = Ethernet (SNMP)
S = Stud X = Plug in /screw terminal block
F = Fan Blank = No fan
T = Yes Blank = No
12, 24, 30, 3 , 48V
Output C Connector type:
Fan cooled:
Temperature Compensation
C output (nominal battery)
x SR 50C/i chargers (front removable) in U rack
*1 This is the default setting. Please specify
if a lower limit is required at time of order
SCHEMA IC BLOCK DIAGRAM

Specifications are subject to change without notice. No liability accepted for errors or omissions. 12
 High performance DC UPS s stem
 No-Break switching between charger & batter
 Batter detection - regular batter presence and
batter circuit integrit checks
 Alarm rela outputs
 LED flash codes for precise state indication
 Deep discharge protection for batteries
 ECB for batter overload & short circuit protection
 Fused reverse batter polarit protection
 Automatic temperature compensated output volts
 Option - batter condition test (BCT)
 Option - communication interface allows remote
monitoring & user control of BCT function - i ver-
sions
 Batteries external to charger - order separatel
ENVIRONMEN AL
Operating
temperature
Storage temperature
Humidity
Cooling
Protection
♦ 24 Month Warranty
Input voltage
Frequency
Fusing / protection
Isolation
Efficiency
Inrush current
Output power
Output voltage
Voltage adj. range
emp. compensation
Current limits
Line regulation
Load regulation
Noise
Drift
Hold-up time
urn on time
hermal protection
OVP
EMI
Safety
Vibration
ELEC RICAL
230V AC: 180V - 264V (standard)
110V AC: 88V - 132V (on request)
50/60 Hz
Input fuse and varistor
Battery fuse plus ECB for battery circuit
1KV DC input - output / earth
> 85%
Soft start circuit
500W
13.8, 27.6, 34.5, 41.4, 55.2VDC
85 - 105% of Vout
Temperature sensor on 1.7m lead with adhe-
sive pad: -4mV / °C / cell ±10%
PSU: 100% rated current
Battery: 25-100% rated current (factory set)
<0.2% over AC input range
<0.4% open circuit to 100% load
<1% output voltage
0.03% / °C
20 ms without battery (nominal - max. Vin)
< 2 sec
Yes, self resetting
Over-voltage protection on output
at ~ 130% of nominal output voltage
to CISPR 22 / EN55022 class A
to IEC950 / EN60950 / AS/NZS3260
Designed to meet MIL-STD-810F Method
514.5
0 to 50 °C ambient at full load
De-rate linearly at >50 °C to zero @ 70 °C
-10 to 85 °C ambient
0 - 95% relative humidity non-condensing
Fan cooled
IP20
No-Break™ FUNC IONS AND ALARMS
Reverse polarity pro-
tection
Battery monitoring
Battery protection
- low battery volts
- overload
- short circuit
Indication LEDs
Alarms
Alarm relay contacts
Standby mode
Battery condition test
(BC )
Battery reverse connection will open internal
fuse (and produce alarm)
Detects for presence of battery on start up,
then every 60 minutes when charge current <
200mA
Electronic circuit breaker (ECB) operates
under the following conditions:
• battery voltage drops to 1.67V/cell -
auto reset
• < 300ms for load > 6 x rated PSU cur-
rent, allows ~1.5x rated PSU current
from battery without acting,
• < 2ms, backed up by fuse
Green: Battery System OK, Power OK
Red: Standby
• Power OK (mains or charger fail, standby
mode)
• Battery System OK - battery voltage low
(on mains fail) , battery missing, battery
circuit wiring faulty, BCT fail (if enabled)
C - NO - NC full changeover rated 1A /50V
DC, 32VAC
Turns off DC output of PSU & allows load to
run off battery
Optional - if enabled, default setting =
20mins/28days). BCT can be started and
stopped by the user on SR500 i. BCT relay
provided to control an external test load.
Optional internal V/I
meter shown
incl. S 500i
SPECIFICATIONS All specifications are typical at nominal input, full load and at 20°C unless otherwise stated.

Specifications are subject to change without notice. No liability accepted for errors or omissions. 13
PHYSICAL
AC Input connector
DC Output Connec-
tions
Alarm Connections
Enclosure
Weight
Dimensions
IEC320 inlet socket (similar to PCs etc.)
M8 brass stud or plug-in/ screw terminal block
Plug in/ screw terminal block
Powder coated steel
4.3kg
225W x 304D x 70H mm (excluding mounting
feet and terminals)
500 Watt
No-Break™ DC charger for lead acid batteries
SCHEMA IC BLOCK DIAGRAM
S ANDARD MODEL ABLE
ACCESSORIES SUPPLIED
Mounting feet together with screws
AC power cord 1.5m with IEC320 socket & AUS/NZ plug
Mating screw terminal plug for ‘X’ version
Mating screw terminal plug for alarm outputs
Crimp lugs for ’S’ versions
OP IONS
19”Rack Mount
Digital V/I meter
Wall Mount Enclosure
Parallel redundancy
Internal V/I Meter
Communications Port
(SR500i...)
MODEL IDEN IFICA ION CODES
Temperature Probe
2U sub rack option: add SR-RM2U
May be fitted with SR500 in 19” rack,
add: SR-ME ER or SR-ME ERV2/SHUN
Charger may be fitted into enclosure with
MCBs and terminals. Code: SEC-SR
Use external output diode, eg +P50
Add code +IN -ME ER
• Ethernet / SNMP v1
• RS485 / Modbus using external converter:
∗ +PRO OCONMB - Modbus serial
∗ +PRO OCONMB-OE - Modbus TCP
& HTTP
• RS232 / IE ASCII code
DC Output
Output (V)
PSU Rated
(A)
Charge
Limit (A) *1
Recomm.
Load (A)
Peak load on
mains fail (A)
SR500C12 13.8 36 36 27 54
SR500C24 27.6 18 18 13 27
SR500C36 41.4 12 12 9 18
SR500C48 55.2 9 9 7 13.5
MODELS
SR500C30 34.5 14.5 14.5 10 21.5
*1 This is the default setting. Please specify
if a lower limit is required at time of order
LAN = ethernet (ASCII) LAN+ = ethernet (SNMP) 232 = RS232 485 =
Input voltage and front
panel standby switch:
S = Stud X = Plug in /screw terminal
Output C Connector type:
F = With fan
Cooling
T = Yes Blank = No
Temperature Compensation
12, 24, 30, 3 , 48V
C output (nominal battery)
C = No-Break™DC i = No-Break™DC with communication port
Function
Power 500W
Communication port
L = 230V AC + sw itch Blank = 230V AC no switch
U = 110V AC + sw itch G = 110V AC no switch
H = 110V C + switch J = 110V C no switch
incl. S 500i

Specifications are subject to change without notice. No liability accepted for errors or omissions. 14
 High performance DC UPS s stem
 No-Break switching between charger & batter
 Batter detection - regular batter presence and
batter circuit integrit checks
 Alarm rela outputs
 LED flash codes for precise state indication
 Deep discharge protection for batteries
 ECB for batter overload & short circuit protection
 Fused reverse batter polarit protection
 Automatic temperature compensated output volts
 Option - batter condition test (BCT)
 Option - communication interface allows remote
monitoring & user control of BCT function - i ver-
sions
 Batteries external to charger - order separatel
ENVIRONMEN AL
Operating
temperature
Storage temperature
Humidity
Cooling
Protection
♦ 24 Month Warranty
Input voltage
Frequency
Fusing / protection
Isolation
Efficiency
Inrush current
Output power
Output voltage
Voltage adj. range
emp. compensation
Current limits
Line regulation
Load regulation
Noise
Drift
Hold-up time
urn on time
hermal protection
OVP
EMI
Safety
Vibration
ELEC RICAL
230V AC: 180V - 264V (standard)
110V AC: 88V - 132V (on request)
50/60 Hz
Input fuse and varistor
Battery fuse plus ECB for battery circuit
1KV DC input - output / earth
> 85%
Soft start circuit
750W
13.8, 27.6, 34.5, 41.4, 55.2VDC
85 - 105% of Vout
Temperature sensor on 1.7m lead with adhe-
sive pad: -4mV / °C / cell ±10%
PSU: 100% rated current
Battery: 25-100% rated current (factory set)
<0.2% over AC input range
<0.4% open circuit to 100% load
<1% output voltage
0.03% / °C
20 ms without battery (nominal - max. Vin)
< 2 sec
Yes, self resetting
Over-voltage protection on output
at ~ 130% of nominal output voltage
to CISPR 22 / EN55022 class A
to IEC950 / EN60950 / AS/NZS3260
Designed to meet MIL-STD-810F Method
514.5
0 to 50 °C ambient at full load
De-rate linearly at >50 °C to zero @ 70 °C
-10 to 85 °C ambient
0 - 95% relative humidity non-condensing
Fan cooled
IP20
No-Break™ FUNC IONS AND ALARMS
Reverse polarity pro-
tection
Battery monitoring
Battery protection
- low battery volts
- overload
- short circuit
Indication LEDs
Alarms
Alarm relay contacts
Standby mode
Battery condition test
(BC )
Battery reverse connection will open internal
fuse (and produce alarm)
Detects for presence of battery on start up,
then every 60 minutes when charge current <
200mA
Electronic circuit breaker (ECB) operates
under the following conditions:
• battery voltage drops to 1.67V/cell -
auto reset
• < 300ms for load > 6 x rated PSU cur-
rent, allows ~1.5x rated PSU current
from battery without acting,
• < 2ms, backed up by fuse
Green: Battery System OK, Power OK
Red: Standby
• Power OK (mains or charger fail, standby
mode)
• Battery System OK - battery voltage low
(on mains fail) , battery missing, battery
circuit wiring faulty, BCT fail (if enabled)
C - NO - NC full changeover rated 1A /50V
DC, 32VAC
Turns off DC output of PSU & allows load to
run off battery
Optional - if enabled, default setting =
20mins/28days). BCT can be started and
stopped by the user on SR750 i. BCT relay
provided to control an external test load.
Optional internal V/I
meter shown
incl. S 750i
SPECIFICATIONS All specifications are typical at nominal input, full load and at 20°C unless otherwise stated.

Specifications are subject to change without notice. No liability accepted for errors or omissions. 15
DC Output
Output (V)
PSU Rated
(A)
Charge
Limit (A) *1
Recomm.
Load (A)
Peak load on
mains fail (A)
SR750C12 13.8 54 54 40 81
SR750C24 27.6 27 27 20 40
SR750C36 41.4 18 18 13 27
SR750C48 55.2 13.5 13.5 10 20
MODELS
SR750C30 34.5 21 21 15 31
S ANDARD MODEL ABLE
PHYSICAL
AC Input connector
DC Output Connec-
tions
Alarm Connections
Enclosure
Weight
Dimensions
IEC320 inlet socket (similar to PCs etc.)
M8 brass stud or plug-in/ screw terminal block
Plug in/ screw terminal block
Powder coated steel
4.3kg
225W x 304D x 70H mm (excluding mounting
feet and terminals)
750 Watt
No-Break™ DC charger for lead acid batteries
SCHEMA IC BLOCK DIAGRAM
ACCESSORIES SUPPLIED
Mounting feet together with screws
AC power cord 1.5m with IEC320 socket & AUS/NZ plug
Mating screw terminal plug for ‘X’ version
Mating screw terminal plug for alarm outputs
Crimp lugs for ’S’ versions
OP IONS
19”Rack Mount
Digital V/I meter
Wall Mount Enclosure
Parallel redundancy
Internal V/I Meter
Communications Port
(SR750i...)
MODEL IDEN IFICA ION CODES
2U sub rack option: add SR-RM2U
May be fitted with SR750 in 19” rack,
add: SR-ME ER or SR-ME ERV2/SHUN
Charger may be fitted into enclosure with
MCBs and terminals. Code: SEC-SR
Use external output diode, eg +P50
Add code +IN -ME ER
• Ethernet / SNMP v1
• RS485 / Modbus using external converter:
∗ +PRO OCONMB - Modbus serial
∗ +PRO OCONMB-OE - Modbus TCP
& HTTP
• RS232 / IE ASCII code
*1 This is the default setting. Please specify
if a lower limit is required at time of order
LAN = ethernet (ASCII) LAN+ = ethernet (SNMP) 232 = RS232 485 =
Input voltage and front
panel standby switch:
S = Stud X = Plug in /screw terminal
Output C Connector type:
F = With fan
Cooling
T = Yes Blank = No
Temperature Compensation
12, 24, 30, 3 , 48V
C output (nominal battery)
C = No-Break™DC i = No-Break™DC with communication port
Function
Power 750W
Communication port
L = 230V AC + sw itch Blank = 230V AC no switch
U = 110V AC + sw itch G = 110V AC no switch
H = 110V C + switch J = 110V C no switch
incl. S 750i
Stud connectors
Screw/plug in
connectors

Helios Power Solutions - Auckland: [phone] - Sydney: [phone] - Singapore: [phone] - www.heliosps.com
ERMS OF WARRAN Y
He ios Power So utions warrants this product for 24 months from date of shipment against materia and workmanship
defects. Liabi ity under this warranty is imited to the rep acement or repair of the defective product as ong as the prod-
uct has not been damaged through misapp ication, neg igence, or unauthorized modification or repair.
CUS OMISED VERSIONS
CSR code BASE MODEL SPECIAL FEATURES
CSR107 SR750C24TFSL Vout = 28Vdc, LVD = 24V, interna V/I meter
CSR108 SR250C24TSL BCT enab ed, conforma coated
CSR122 SR250C12TFSL As specified by the customer.