Desktop Switching Owner's Manual Power Supplies Model: SEC-1245A SEC-2425A Please read this manual before operating your power supply
CONTENTS Important safety precautions................................................................2 Description..........................................................................................3 Features..............................................................................................3 Components and accessories..............................................................4 Specifying lead acid batteries and chargers..........................................5 Charging stages..........
IMPORTANT SAFETY PRECAUTIONS Hazardous conditions may result if the charger is not installed or operated correctly. Please read the following instructions to prevent personal injury or damage to the charger. BATTERY RELATED • • • • • • To reduce the risk of battery explosion, follow these instructions and those marked on the battery. Never smoke or allow an open spark or flame in the vicinity of the battery or the engine.
DESCRIPTION SEC-1245A (for 12 V batteries) and SEC-2425A (for 24 V batteries) are high current, 3 Stage Chargers that deliver 45 A and 25 A respectively for almost 75% to 80% of the charging cycle ensuring a very fast, safe and complete charging of lead acid batteries.
COMPONENTS AND ACCESSORIES 7 1. Output Connnector + Bank 1 2. Output Connector + Bank 2 3. Output Connector - Common 4. Charging Indicator LED 5. DIP Switches for mode selection 6. Jack for Remote Panel 7. Push Switch for Half Power Mode 8. LED for Half Power Mode indication 4 8 6 5 1 2 3 9 11 12 9. AC input Power On / Off Switch 10. AC fuse holder 11. Cooling fan 12. Jack for Temperature Sensor 13. AC power cord inlet 10 13 14*. Cable with plug 15*.
SPECIFYING LEAD ACID BATTERIES AND CHARGERS FLOODED / WET CELL AND SLA (SEALED LEAD ACID) BATTERIES There are two categories of lead acid batteries – Flooded/Wet Cell and Sealed Lead Acid (SLA). A flooded/wet cell battery has a high tolerance to overcharging. However, it will release hydrogen gas when charging that must be properly vented and the water level must be checked frequently. SLA batteries can either be Gel Cell or AGM (Absorbed Glass Mat).
UNITS OF BATTERY CAPACITY The battery capacity is the measure of the energy the battery can store and deliver to a load. It is determined by how much current any given battery can deliver over a stipulated period of time. The energy rating is expressed in Ampere Hours (AH). For example, as one of the bench marks, the battery industry rates batteries at 20 hour rate i.e. how many Amperes of current the battery can deliver for 20 hours at 80 º F till the voltage drops to 10.
DEPTH OF DISCHARGE AND BATTERY LIFE The more deeply a battery is discharged on each cycle, the shorter the battery life. Using more batteries than the minimum required will result in longer life for the battery bank. A typical cycle life chart is given at Table 2 below: Table 2.
CHARGING BATTERIES The batteries can be charged by using good quality AC powered battery charger or from alternative energy sources like solar panels, wind or hydro systems. Make sure an appropriate battery charge controller is used. It is recommended that the batteries may not be charged at current > C/5 (where C is the AH capacity of the battery at 20 hour discharge rate).
CHARGING STAGES Stage 2 Uo Phase Timed for 4 / 8 Hours Stage 1 I Phase Uo Stage 3, U Phase U Curve for Voltage U, Uo Voltage V Curve for Current I 80% of current capacity of charger 10% of current capacity of charger Current, I Time, Hours Figure 1 Charging Curve NOTE: Voltage reading on no load. The output terminals of the charger consist of one common white / black negative terminal (3) and two red positive terminals (1, 2) for charging two banks of batteries.
BATTERY VOLTAGES – CHARGED AND DISCHARGED CONDITIONS The cell voltage of a battery depends upon the temperature of the battery and has a negative temperature coefficient – the voltage level increases at lower temperature and decreases at higher temperature. The voltages are normally specified at 80º F (26.7º C). On a 12 volt battery, the no load battery voltage is between 11.4 VDC (fully discharged) and 12.9-13.0 VDC (fully charged). On a 24 volt battery, the no load battery voltage is between 22.
Stage 2 - Constant Overcharge Voltage, Timed Absorption / Boost Charge Mode (Uo Phase): When the charger enters Stage 2 from Stage 1, the battery is approximately 70% to 80% recharged. As soon as it enters this stage, a timer circuit is also initiated. The timer circuit can be selected to operate for 4 or 8 hours with the help of DIP Switches (5) (See under “Selecting time for Absorption / Boost Stage”).
CAUTION! 3 stage charging is recommended for charging stand-alone unloaded batteries (there is no load connected to the battery when it is being charged). If a load is also connected simultaneously, a part of the charger’s output current will be diverted to this load. Thus, the charger may remain locked in Stage 2 if the current drawn by the load is more than the preset value of threshold current determining change over from Stage 2 to Stage 3 .This will lead to overcharging and loss of electrolyte.
PROTECTIONS The charger has the following protections: SHORT CIRCUIT SHUT DOWN In case of a short circuit on the output side, the output of the charger will be shut down. The Charging Indication LED (4) on the front panel will turn red (On the Remote Panel (15), the red LED “I Phase” will light, the green LED “Power” will, however, remain lighted). The charger will be latched in this shut down condition and will NOT recover automatically even after the short circuit condition is removed.
INSTALLATION LOCATION, MOUNTING AND SAFETY The charger is required to be installed in a safe, well ventilated and dry location. Please see the details given under “Important Safety Precautions”. The charger can be mounted horizontally or vertically. When mounting vertically, please ensure that the axis of the fan rotor is horizontal (to reduce stress on the bearing). OUTPUT CONNECTORS Connectors with tubular, screw down type of terminals are used for output connection.
PREPARING THE CHARGER FOR OPERATION SELECTING AC INPUT VOLTAGE The charger is pre-set to operate from AC input voltage of 120 VAC, 50 / 60 Hz. To operate the charger from AC input voltage of 230 VAC, 50 / 60 Hz, change the internal setting as follows: 1. Remove the bottom cover plate by removing the 4 screws. Please note that the bottom cover plate has 4 rows of ventilation slots towards one end of the plate and this end with the slots is placed towards the end of the housing with the output terminals.
CHARGING MORE THAN ONE BANK OF BATTERIES CAUTION! When charging more than one bank of batteries at the same time using 3 Stage Charging, ensure that the batteries in the banks are in a similar discharged condition. If one bank is completely discharged and another is almost fully charged, the bank that is fully charged will be subjected to over charge condition during the time when the charger remains in Stage 2 (“Uo” Phase) for charging the completely discharged bank.
DIP Switch Setting for SEC-2425A S1 S2 Float Stand-alone charging OFF * ON * 27 V * ON OFF 27 V Boost Battery Type / Application 28.8 V * Flooded / AGM * 28.0 V Gel Cell Charging Stages 3 Stages (Stages 1, 2, 3) 3 Stages (Stages 1, 2, 3) Charging loaded battery or Charging two banks and the batteries in the two banks are in dissimilar discharged condition OFF OFF 27 V 27.
REDUCTION OF MAXIMUM CHARGING CAPACITY TO HALF TO CHARGE LOWER CAPACITY BATTERIES Batteries should not be charged at very high currents to ensure long life. Normally, the maximum charging current should be limited to approximately C/5 (where C is the AH capacity of the battery at 20 hour rate).
REMOTE PANEL - MODEL NO. 900-RC An optional wired Remote Panel Model No. 900-RC (15) can be ordered. It comes with 10 metres of flat ribbon cable (14) that has 8 position modular male connector on either end. The Remote Panel (15) can be used to switch on / switch off the charger and also monitor the charging status of the charger from a remote location.
OPERATION SWITCHING ON / OFF The charger is switched on /off with the illuminated AC input power on / off switch (9) located on the rear panel of the unit. The switch is illuminated Red when switched on. INDICATION OF NORMAL OPERATION AND CHARGING STATUS When the charger is switched on without any load, the Charging Indicator LED (4) on the front panel turns Red, Orange and then Green. The fan (11) will come on momentarily and switch off.
CHARGING A BATTERY INSTALLED IN A VEHICLE Follow these steps when the battery is installed in a vehicle. A spark near a battery may cause battery explosion. For safety and to reduce the risk of spark near the battery: 1. Position AC and DC cords to reduce risk of damage by hood, door or moving engine parts. 2. Stay clear of fan blades, belts, pulleys and other parts that can cause injury to persons. 3. Check the polarity of the battery posts.
POWERING OTHER DC LOADS The charger can be used as a power supply or as a DC UPS (DC Un-interruptible Power Supply. For both these applications, first set switches S1 and S2 of DIP Switch (5) to off position to set the charger to work in 2 stage mode (See under “Selecting the Type of Battery and Charging Stages”). USING THE CHARGER AS A POWER SUPPLY To use as a power supply, first switch off the DC load.
TROUBLESHOOTING The symptoms of abnormal operation and the possible cause(s) and remedies are given in the succeeding paragraphs. There is no output. The AC power on / off switch (9) does not illuminate when switched on. The charging indicator LED (4) is off (On the Remote Panel (15), the Green LED under “Power” is off). There is no AC input voltage in the outlet: Check that AC power is available in the AC outlet receptacle and that it is switched on.
When the charger is powered and is being used as a DC power supply / UPS, the output voltage drops when the DC load is switched on or increased. The charger is being forced into current limit condition. The load is trying to draw current more than the current limit value of the charger – 45 A for Normal operation & 22.5 A +/- 1 A for “Half Power Mode” for SEC-1245A and 25 A for Normal operation & 12.
The battery is taking excessively long time to fully recharge or When the charger is powered and is being used as a DC power supply / UPS, the output voltage drops at lower DC load currents The unit is in “Half Power Mode”. (Green LED (8) located on the bottom left corner of the front panel of the unit is lighted). When this mode is selected, the maximum charging current will be automatically reduced to 22.5 A +/- 1 A for SEC-1245A and 12.5 A +/-1 A for SEC2425A. Hence, the charging time will increase.
SPECIFICATIONS PARAMETER Nominal Input Voltage Factory Preset SEC-1245A SEC-2425A 120 VAC/50-60 Hz (105 to 125 VAC) 230 VAC/50-60 Hz (207 to 253 VAC) 120 VAC/50-60 Hz (105 to 125 VAC) 230 VAC/50-60 Hz (207 to 253 VAC) By changing internal jumper position Input Current At 120 VAC input 10.3A At 230 VAC input 5.2A Output Voltage, VDC Absorption / Boost, “Uo”* 14 V/14.4 V +/-0.05 V Float / Maintenance, “U”* 13.5 V +/-0.05 V Maximum Bulk Charging Current, I Normal operation 45 A Half Power Mode 22.
WARRANTY INFORMATION 2 YEAR Limited Warranty SEC-1245A / SEC-2425A battery chargers manufactured by Samlex America, Inc. (the “Warrantor”) are 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 Authorization Number.
110-17 Fawcett Rd T: 604 525 3836 Coquitlam, B.C. F: 604 525 5221 Canada V3K 6V2 4&$ " 4&$ " "VH e-mail: samlex@samlexamerica.com website: www.samlexamerica.
