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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:
Critical factors in the lifetime and capacity of (lead-acid) batteries
Unique additional features of the No – Break ™ DC UPS system
Model | Output (V) | PSU Rated (A) | Charge Limit (A) *1 | Recomm. Load (A) |
SR500i12 | 13.8 | 36 | 36 | 30 |
SR500i24 | 27.6 | 18 | 18 | 13 |
SR5000i30 | 34.5 | 14.5 | 14.5 | 10 |
SR500i36 | 41.4 | 12 | 12 | 8 |
SR500i48 | 55.2 | 9 | 9 | 6 |
SR750i12 | 13.8 | 54 | 54 | 42 |
SR750i24 | 27.6 | 27 | 27 | 19 |
SR750i30 | 34.5 | 21 | 21 | 14 |
SR750i36 | 41.4 | 18 | 18 | 12 |
SR750i48 | 55.2 | 13.5 | 13.5 | 8.5 |
ELECTRICAL | |
Input | 180V – 264VAC |
Input Optional | 88V – 132VAC (internal link select) 88-135VDC (specify at time of order) |
Frequency | 45-65Hz |
Fusing | Internal AC input fuse |
Overcurrent protection | Constant current limit under overload and short circuit conditions |
Isolation | 1KV DC input – output / earth |
Efficiency | > 85% |
Inrush current | soft start circuit |
Output voltages | 13.8, 27.6, 34.5, 41.4, 55.2VDC |
Voltage adj. range | 85 – 115% of Vout |
Temperature Compensation | Temperature sensor on 1.7m lead with adhesive pad: -4mV / °C / cell ±10% |
Current limit | PSU: 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 time | 15 – 20 ms without battery |
Thermal Protection | Yes, self-resetting |
No-BreakTM FUNTIONS AND ALARMS | |
Battery charge current limit | See Model Table for default settings – may be increased to PSU rated current |
Reverse polarity protection | Battery reverse connection will open internal fuse (and produce alarm) |
Battery monitoring | Detects for presence of battery on start up, then every 60 minutes when charge current < 200mA |
Battery circuit protection | Electronic circuit breaker (ECB) operates under the following conditions: |
– low battery volts | battery 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 indication | Green: 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 contacts | C – 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 Mode | Turns off DC output of PSU & allows load to run off battery |
MECHANICAL | |
Dimensions | 225W x 304D x 70H mm |
Weight | 4.4kg |
AC Input Connector | IEC320 inlet socket |
DC Connections | M6 brass studs or plug-in socket with screw terminals |
STANDARDS | |
Emi | To CISPR 22 / EN55022 class A |
Safety | To IEC950 / EN60950 / AS/NZS3260 |
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.
The No-Break ™ DC UPS has many features which a normal float charger does not, these including:
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.
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
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.
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.
At approximately 1.67 volts per 2V (nominal) cell, so for a 12V system the disconnect voltage is set at 10V.
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:
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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