Feature Battery-Backed Power Battery-backed power is in demand
Recently there has been an increase in the demand for AC to DC power sources that can be battery-backed to provide constant power in industrial applications as well as in medical and security systems. As a result, Powersolve has introduced a number of power supplies designed specifically for battery-backed power applications. The company’s Peter Clark explains
F
irst up from Powersolve is a range of industrial DIN-rail power sup- plies that work from a wide AC input range and provide up to
600W. Designed for system applications in machine tools and process automa- tion, the TracoPower TIS Series pro- vides adjustable output voltages of 12, 24, 48 or 72V DC and come with several additional function modules to widen the range of possible applications. These include a battery controller module, battery packs and a buffer module that will maintain the output voltage of a 24V DC power supply during ‘typical’ mains faults, short time blackouts or voltage dips. Within this ‘buffer’ period, the module guarantees no deterioration of the output voltage. The battery controller module pro- vides the basis for a professional bat- tery management system to charge and monitor an external battery. In the event of a power failure the battery is switched without any interruption to the DC output. Once mains power is restored, the battery is switched off. Back-up time is limited only by the battery capacity and load current. Charger voltage/current can be adjusted to suit the battery type. The battery pack contains maintenance- free lead acid 3.2Ah batteries. The units feature power fail and low battery alarm signals and, during normal operation, battery status is checked periodically while the exter- nal battery is fully protected under any operating conditions. They will oper- ate at temperatures between -25°C to 70°C and meet all relevant safety and EMI/EMC standards.
Enclosed and open frame Powersolve’s PQP/PQE power sources are designed to be integrated into products and systems that need con- stant power. Together, the two ranges provide 16 models in an open frame (PQP) or enclosed (PQE) format - all models work from a universal AC input and provide one or two DC out- puts with battery charger.
Output voltages are 12V or 24V DC, plus charger output and models are also available with an auxiliary +5V 3A output. For 12V or 24V the appro-
S10
the model selected. PKR Series units are available to provide between 1kVA and 10kVA. Battery recharge time is very quick - 90% charge in less than three hours for the smaller units and less than four hours for the six and 10kVA models.
An automatic bypass is incorpo- rated into PKR units, which switch over to the incoming mains in the event of an inverter failure. Powersolve use Yuasa high capacity NPW45-12 five year life batteries as standard with ten year life versions available as an option.
priate voltage battery needs to be used. Both open frame and enclosed ver- sions are free-air convection cooled so require no fan and incorporate a number of features designed to ensure that constant power is available in the event of mains failure. These include ‘auto-switch’ when power is off, bat- tery low protection, battery polarity protection, brownout (AC input low) protection and an integral constant current limiting circuit. Operating temperature range is -25°C to 70°C. Other significant features include alarm signals for AC OK and battery low, as well as short circuit, overload and overvoltage protection. Both PQP and PQE Series meet all relevant safety and EMI/EMS standards.
The enclosed PQE Series measures 129.5 x 97.5 x 37.5mm, the open frame PQP Series measures 123 x 95 x 31mm, with connection by screw terminals.
19" rack mount
Although designed primarily for IT and telecoms applications, the PKR Series is also finding widespread use in more industrial type situations. These power supplies accept a wide input voltage range with models able to work with either 115V AC or 230V AC at 50/60Hz. Input power factor is high at >0.98. Output voltage is either 110/120V AC or 220/230V AC ±2% and battery hold-up times depend on
SEPTEMBER 2013 UPS & Standby Power
PKR Series UPS units use an online double conversion design normally found in more expensive units. The main advantage of an online UPS is the unit’s ability to provide an electrical ‘firewall’ between the mains and the equipment it protects. In effect, it pro- vides full protection against all manner of power quality issues as well as mains failure, with zero transfer time when switching to battery back-up. Although most users will specify the PKR supplies for 19" rack mount, they can also be used as stand alone tower units. An LED display indicates the unit’s status while an LCD display shows volts, frequency etc. Alarms alert users to UPS failure, low battery voltage and the presence of an abnormal mains supply while PKR Series units are pro- tected against overload, over tempera- ture and short circuit. Operating temperature range is 0 to 40°C. An intelligent RS232 communica- tions port allows for remote manage- ment via UPS power management software or UPSilon 2000, and users also have the option of control using an external SNMP, USB or dry contact connection. Output is via IEC sockets or screw terminals depending on power rating.
Powersolve
www.powersolve.co.uk T: 01635 521 858
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