Related Manuals for SamplexPower BBM-1225
Summary of Contents for SamplexPower BBM-1225
- Page 1 Battery Owner's Please read this manual before Manual Back-up operating your Model: BBM-1225...
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Page 2: Table Of Contents
INDEX Safety instructions ............2 Description ..............2 Principle of operation ..........3,4,5,6 Installation ..............7,8 Specifications ..............9 Warranty information ............ 10... -
Page 3: Safety Instructions
SAFETY INSTRUCTIONS Precautions when working with batteries. - Batteries contain very corrosive diluted sulphuric acid as electrolyte. Precautions should be taken to prevent contact with skin, eyes or clothing - Batteries generate hydrogen and oxygen during charging resulting in evolution of explosive gas mixture. -
Page 4: Principle Of Operation
PRINCIPLE OF OPERATION Please refer to the schematic diagram at Fig. 1 The power supply is connected to the positive and negative input terminals. The battery is connected (through a fast acting fuse of the appropriate current capacity) to the battery terminals and the load is connected to the load terminals. The voltage from the power supply is fed through the isolating Schottky diode D1 to the load and to the battery through the charging current limiting resistors R1 and R2. - Page 5 Power supply voltage for 12V SLA battery backup: 14 V (The output voltage of this unit for the load and for float charging of the battery will be 14 V minus drop of 0.4 V to 0.5 V across diode D1 i.e. 13.6 V to 13.5 V) Power supply voltage for 24V SLA battery backup: 27.6 V (The output voltage for the load and for float charging of the battery will be 27.6 V minus drop of 0.4 V to 0.5 V across diode D1 i.e.
- Page 6 If the power supply fails, the load will be supplied by the battery through the Schottky diode D2. As in the case of diode D1, there will be a forward voltage drop of 0.4 to 0.5 V across D2. Thus, when the battery is supplying the load, the voltage seen by the load will be 0.4 to 0.5 V less than the battery voltage.
- Page 7 Calculating maximum battery charging current Maximum battery charging current Ib = {(Vp – Vd) – Vb} divided by Rs ………. Equation 1 Vp = The output voltage of the power supply Vd = Forward voltage drop across D1 (0.4 V for < 1 A and 0.4 V > 10 A) Vb = Battery voltage at fully discharged condition (Normally 11.4 V for 12 V and 22.8 V for 24 V) Rs = Equivalent series resistance (In this case, two 1 Ohm in parallel = 0.6 Ohm)
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Page 8: Installation
INSTALLATION CABLE SIZING, TERMINATION AND FUSING The size of the cables used to connect the power supply, the battery and the load to this unit will depend upon the maximum value of the current flow and the length of the cable run. Current flowing through a cable will produce an undesir- able voltage drop along the length of the cable. - Page 9 CONNECTIONS Before the power supply is connected to this unit, it is to be ensured that the output voltage of the power supply is adjusted to the required voltage as ex- plained under “Principle of Operation”. Switch off the power supply. Connect the positive and negative output of the power supply to the input terminals of the unit marked “INPUT POSITIVE”...
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Page 10: Specifications
SPECIFICATIONS Input voltage 14 VDC for 12 V battery 27.6 VDC for 24 V battery Input current Up to 25 A Output Voltage 0.5 V less than the input voltage (At 10 A) i.e. • 13.5 VDC for input voltage of 14 VDC for 12 V battery •... -
Page 11: Warranty Information
2 YEAR Limited Warranty The BBM-1225 manufactured by Samlex America, Inc. ( the “ Warrantor “ ) is warranted to be free from defects in workmanship and materials under normal use and service. This warranty is in effect for 2 years from the date of purchase by the user ( the “ Purchaser “) For a warranty claim, the Purchaser should contact the place of purchase to obtain a Return Authoriza- tion Number. - Page 12 110-17 Fawcett Rd T: 604 525 3836 website: www.samlexamerica.com Coquitlam, B.C. F: 604 525 5221 Canada V3K 6V2 IVersion# BBM-1225(June 2005)
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