The New SR250Hi 250 W power supply is designed to provide DC power to lead-acid batteries for critical backup applications. All the functionality and durability has been retained with a more modern and easier to understand range of products being developed.Form factor and connectivity remains the same, so they will fit into the slots occupied by the old range – the legend continues!
No-Break ™ DC UPS systems maximise the integrity of standby battery installations, whilst optimising the life and availability of back up batteries. They are now available with Serial and Ethernet Communications options.
The No-Break ™ system is the ideal solution for:
Other features include:
|Model||Output (V)||PSU Rated (A)||Charge Limit (A)||Recomm. Load (A)||Peak load on power fail (A)|
|Output power||250 W|
|Input Voltage||180V – 264VAC 45-65Hz|
|Output Voltages||12V, 24V, 30V, 36V, 48V|
|Voltage Adj. Range||85% – 105% of Vout|
|Overcurrent protection||Constant current limit under overload and short circuit conditions|
|Isolation||Input – earth – 2.5KVdc|
|Output – earth – 500Vdc|
|Operating temperature||-20 to 50 °C ambient at full load|
|Humidity||0 – 95% relative humidity non – condensing|
|LVD||Low Voltage Disconnect|
|LED Indication||Green: Batt OK|
|Green: Power OK|
|Alarms Relay||Form C contacts 30VDC,2A/110VDC,0.3A,125VAC, 0.5A|
|AUX (Activated by BCT)|
|POWER (main fails, PSU fails)|
|BATTERY (batt missing , batt low, BCT fail)|
|Temp. Compensation||Temperature sensor on 1.7m lead with adhesive pad: -4mV/ °C / cell ± 10%|
|Battery Charge Current Limit||Customizable on request.|
|Reverse Polarity||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|
|Overload: Max load must not exceed 110% of rated current. Peak loads must be connected to B+ & B– terminals. Not suitable for N+1 connection|
|Short Circuit: <2ms, backed up by fuse|
|Standby Mode||Turns off DC output of PSU & allows load to run off battery|
|Optional Input Voltage||88 – 132 VAC|
|Communication Port||· RS232 (ASCII)|
|· RS485 (ASCII)|
|· Modbus RTU|
|· SNMP, Webpages|
|Digital Inputs/Outputs||Customizable 3 Digital Inputs and 1 Digital Output|
|Battery Condition Test (BCT)||Option auto test enabled on start-up|
|· 19”Rack Mount . Optional V/I meter for subrack : SR-Meter|
|· Wall Mount|
|Boost Charger||Customizable feature on request.|
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 SR250HL
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.