SR500i & SR750i Industrial DC UPS

No – Break ™ DC Uninterruptible Power Supply TECHNOLOGY 

Helios Power Solutions proprietary No-Break ™ DC UPS Technology represents a truly unique, comprehensive approach to providing uninterruptible and secure DC power when you need it. The system maximises the integrity of standby battery installations whilst optimising the life and availability of the backup batteries.

The No – Break ™ DC UPS intelligent system provides a vastly improved solution over the traditional methods of float charger plus battery. The battery is accurately charged with independent current limit and you cannot overload the charger or overheat the battery.

The No – Break ™ DC UPS highly efficient system is the ideal solution for:

  • Systems which require no transition from mains to battery backup
  • Applications having standing load with back up standby battery installed
  • Cost-effective management of your battery system investment
  • Mission Critical systems from 100W to 750W and above

Critical factors in the lifetime and capacity of (lead-acid) batteries

  • Temperature compensation
  • Controlled charge current
  • Regular check up
  • Deep discharge protection

Unique additional features of the No – Break ™ DC UPS system

  • Battery Detection: Monitors integrity of battery circuit hourly (battery missing, open fuse/electronic breaker)
  • Battery Condition Test (0ption): Indicative test of battery autonomy at predetermined intervals (automated battery condition check, ideal for remote sites).
  • Configurable Software 
  • Adjustable Load 
  • Communications Interface Port: (Options RS485 , RS232 , Ethernet)

SERIES TABLE

ModelOutput (V) PSU Rated  (A)Charge
 Limit (A) *1
 
Recomm. Load  (A)
SR500i1213.8363630
SR500i2427.6181813
SR5000i3034.514.514.510
SR500i3641.412128
SR500i4855.2996
SR750i1213.8545442
SR750i2427.6272719
SR750i3034.5212114
SR750i3641.4181812
SR750i4855.213.513.58.5

Specifications Table

ELECTRICAL
Input180V – 264VAC
Input Optional88V – 132VAC  (internal link select)
88-135VDC (specify at time of order)
Frequency45-65Hz
FusingInternal AC input fuse
Overcurrent protectionConstant current limit under overload and short circuit conditions
Isolation1KV DC input – output / earth
Efficiency> 85%
Inrush currentsoft start circuit
Output voltages13.8, 27.6, 34.5, 41.4, 55.2VDC
Voltage adj. range85 – 115% of Vout
Temperature  CompensationTemperature sensor on 1.7m lead with adhesive pad:  -4mV / °C / cell ±10%
Current limitPSU:  100% rated current  – Battery:  25-100% PSU current
Line regulation<0.2% over input range
Load regulation<0.4% open circuit to 100% load
Noise<1%
Hold-up time15 – 20 ms without battery
Thermal ProtectionYes, self-resetting
No-BreakTM FUNTIONS AND ALARMS 
Battery charge current limitSee Model Table for default settings – may be increased to PSU rated current
Reverse polarity protectionBattery reverse connection will open internal fuse (and produce alarm)
Battery monitoringDetects for presence of battery on start up, then every 60 minutes when charge current < 200mA
Battery circuit protectionElectronic circuit breaker (ECB) operates under the following conditions:
– low battery voltsbattery voltage drops to 1.67V/cell  – auto reset on power on
– overload< 300ms for I bat > 6 x I PSU rated, allows ~1.5x rated PSU current from battery without acting,
 – short circuit< 2ms, backed up by fuse
LED indicationGreen:  Power OK – Green: Battery OK
Alarms – Power OK (Mains/PSU fail)
– Battery System OK –  alarms when battery voltage low (on mains fail), battery missing, battery circuit wiring faulty, BCT fail (if enabled)
Alarm  relay contactsC – NO – NC full changeover rated 30VDC,2A /110VDC,0.3A/125VAC,0.5A
Battery condition test (BCT)Standard on SR500- 750i – 20mins/28days unless otherwise specified on ordering.
Standby ModeTurns off DC output of PSU & allows load to run off battery
MECHANICAL
Dimensions225W x 304D x 70H mm
Weight4.4kg
AC Input ConnectorIEC320 inlet socket
DC ConnectionsM6 brass studs or plug-in socket with screw terminals
STANDARDS 
EmiTo CISPR 22 / EN55022 class A
SafetyTo IEC950 / EN60950 / AS/NZS3260

FAQ

  •  Why is Helios Power Solutions SR No-Break ; DC charger recommended by consultants for critical applications?

Our No-Break ™ DC chargers have been designed for industrial use and have over twenty years of proven reliable operations.  In addition, the chargers have many outstanding features such as fault alarms, LED fault alarm codes, battery detection, low voltage disconnect circuitry, automatic battery condition testing, communication options and can be connected to the battery permanently due to the precise temperature-compensated voltage control.

  • Why should we use a SR No-Break; as opposed to a normal float charger?

The No-Break ™ DC UPS  has many features which a normal float charger does not, these including:

    • Precise alarm indication for mains or DC faults
    • Overcurrent protection on the battery circuit
    • Battery presence checking
    • Temperature-compensated charging
    • Low voltage disconnect circuitry to prevent deep discharge of the battery
    • Independent charge current limit
    • Automatic battery condition testing
  • Why don’t you use a boost charge on the SR No-Break unit?

Normally it is not necessary to have a boost on the No-Break ™ unit, as the power is on the system continuously and it is not that critical to restoring 100% of charge rapidly, as in the case of cyclic applications.  A boost charge voltage may damage the equipment which is permanently connected to a standby system.

  • Can I use the SR No-Break DC UPS without a battery?

No, the No-Break ™DC UPS is designed to operate with a battery connected and instability may result if there is no battery connected.  If you wanted to do this then it is advisable to use a standard two-terminal DC power supply SRHL

  • Why is the battery negative separate from the load negative in the SR No-Break DC UPS?

This is done to implement two of the features of the No-Break ™ UPS/charger.  There is an “electronic circuit breaker” fitted between the battery negative and load negative terminals to provide the battery overcurrent protection.  The separate battery circuit also allows for independent control of the charging current when required.

  • Can I connect the battery directly to the load terminals when using SR No-Break DC UPS?

No, it would nullify all the features of using the No-Break ™DC design and provide false alarm signals from the relays.  If you wanted to do this, then it is advisable to use a standard two-terminal float charger, with or without alarms.

  • When does the SR No-Break system disconnect to protect deep discharge of the battery?

At approximately 1.67 volts per 2V (nominal) cell, so for a 12V system the disconnect voltage is set at 10V.

Ask for Assistance

Selecting the right power supply for your application is not a small task. Let our technical sales engineers guide you through the process of choosing the right solution for your needs.

Below some parameters usually required to size and select the right power supply:

  • Power & control requirements
  • Output & Input Voltage / Multioutput Voltage / Variable Voltage
  • Redundancy level
  • Mounting
  • Inrush Current
  • Environmental specifications (Temperature, altitude, vibration, shock)
  • Specific Industries Standards (Railway, Military, Medical)
  • Terminals

Contact Our Team

Contact our team of experienced engineers to discuss your unique power conversion and backup needs. We offer a wide range of highly reliable components that can be integrated and customized to create a solution that meets or exceeds your requirements.

For power automation systems please contact us at power.systems.automation@heliosps.com.au

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