![]() Most batteries don’t like being discharged very low. If shutting off the load, is it more important to save the batteries or keep the load running for as long as possible. The trip voltage you set depends on the application – is it an indication, activating an alarm or shutting off the load. This should suit most SLA 12V battery systems. This provides a low voltage trip at approximately 11.2V or 22.6V and a restore from trip at 12.5V or 25.2V. Protection Fuse : A fuse of maximum 5 Amp for the relay contact load will protect the circuit board.ĭefault DIP-Switch setting = 3, 5 and 8 on. Mounting: Typically using industrial grade double sided sticky foam: see notes below. The LED indicates normal operation and a low voltage tripped state. This can activate an alarm when a monitored battery voltage drops too low.īoth equipment power and an alarm can be connected at the same time when using the same power supply. The normally-open circuit is switched to common when the monitored voltage drops below the low trip setting. This can be used to power equipment while the monitored battery voltage is good, and shut the equipment off when the battery voltage drops too low. The normally-closed circuit is typically used for alarm monitoring or circuits that are active while the monitored voltage is good, or above the low trip setting. The relay terminals provide a standard clean contact output, with common (C), normally-closed (NC) and normally-open (NO).įrom common to normally-open or normally-closed the relay can switch any load up to 50 volts AC or DC and up to 2 Amps. The module is protected against reverse polarity connection of the supply. The 5 screw terminals are from left to right, +ve, -ve (–), and 3 relay connections typically C, NC, NO.Īpply the 12V or 24V power to the +ve and -ve (–) terminals and the module is operating. Note: Refer to the module label to confirm the connection order. This can be used to switch off equipment or trigger an alarm etc. When the applied nominal voltage drops below the trip set-point, the relay changes state. The set circuit is now ready to be attached with the battery in question, whenever the battery voltage reaches the 11.4V mark, the LED would light up, providing the required low battery information.These are low voltage detectors for 12V and 24V battery monitoring. Now the preset may be glued by some permanent adhesive for preventing the setting from getting disturbed. Next, the preset should be adjusted such that the LED just lights up. Suppose, the specified lower threshold is 11.4V for a 12V battery, the applied sample voltage can be fixed at 11.4V and applied to the circuit. The above setting can be done manually by applying a sample voltage to the circuit imitating the lower threshold level. The battery voltage is allowed to reach pin#2 of the IC via the preset, which must be manually set such that voltage at pin#2 just falls below the 1/3rd of the zener voltage when the battery voltage reaches the specified lower threshold. Therefore in the proposed design the supply pin of the IC is fixed at some reference level using a zener diode. The above fact also indicates that pin#2 responds with reference to the supply voltage applied at pin#8 of the IC, which implies this voltage at pin#8 should be clamped to some constant level. We all know regarding the basic characteristic of the IC 555 when it's being used in the comparator mode: if pin#2 is subjected to a potential lower than 1/3rd of the Vcc, the output pin#3 goes high. The circuit functioning may be understood with the following points: ![]() An over discharge could mean a permanent damage to the battery.Ī novel little low battery indicator circuit can be learned here, which incorporates just a single IC555 and a few resistors, it's a simple "plug and watch" kind of circuit. Many electronic circuits such as emergency lights, battery chargers, UPS systems, flashlights etc essentially require a low battery indication feature in order to avoid over discharge of the involved battery. ![]()
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