Guard-25A is a product in "Guard" series. It has a special design called Lithium Battery Pack Balance Discharge Monitoring and Protectiing function which make it very attractive.
This function is a great innovation. With this function, the ESC can real time monitor the discharge voltage of each Li-xx (Li-ion/Li-poly) cell in a battery pack. No longer worry about over-discharging problem, the Lithium battery pack will have much longer life. This design help R/C fans to reduce costs for buying battery packs.
1 Specification
1.1 Output: Continues 25A, Burst 35A up to 10 Secs.
1.2 Input Voltage: 5.6V --- 16.8V ( Lithium : 2 ¨C 4s or NiMH/NiCd 5 -12 Cells)
1.3 BEC (Battery Elimination Circuit) Output: linear mode BEC 2A
1.4 Max Speed: 210,000rpm for 2 Poles BLM, 70,000rpm for 6 poles BLM, 35,000rpm for 12 poles BLM. (BLM: BrushLess Motor)
1.5 Size: 24mm*45mm*12mm(width*length*height)
1.6 Weight: 32g (Include the weight of a Lithium Battery Pack Balance Discharge Monitoring and Protection socket)
1.7 Packaging include:
¡ñA Lithium Battery Pack Balance Discharge Monitoring and Protection socket
¡ñ3 sets of gold plated motor connectors and heat-shrink tubings (Remark: motor connectors and heat-shrink tubings need to be purchased additionally)
2 Features
2.1 Safety Arming Feature: Regardless the Throttle Stick position, the motor will not spin after battery connected. This will prevent any injury happened.
2.2 Throttle Calibration: Throttle range can be configured to provide best throttling linearity, fully compatible with all market available transmitters.
2.3 Programmable Items:
¡ñBrake Settings: brake enabled / brake disabled, default is brake disabled
¡ñBattery Type: Li-xx(Li-ion or Li-poly) / Ni-xx(NiMh or Nicd)£¬default is Li-xx.
¡ñLow Voltage Protection Mode(Cutoff Mode) : power reducing / power cutoff, default is power reducing.
¡ñLow Voltage Protection Threshold(Cutoff Threshold) : low / medium / high, default is medium cutoff voltage.
-When not using Balance discharge protection function ( i.e. Do not plug the balance charge connector into the balance discharge protection socket on ESC, in this case , the ESC only monitor the voltage of whole battery pack )
1) For Li-xx battery£¬number of battery cells are judged automatically£¬low / medium / high cutoff voltage for each cell are: 2.6V/2.85V/3.1V. For example: 3 Cell Li-Poly, when medium cutoff voltage is set, the cutoff voltage is: 2.85*3=8.55V.
2) For Ni-xx battery, low / medium / high cutoff voltages are 0/45%/60% of the startup voltage. (0% means the low voltage cutoff function is disabled). For example: 10 cells NiMH battery, fully charged voltage is 1.44*10=14.4V, when medium cutoff voltage is set, the cutoff voltage is : 14.4*45%=6.5V
-When using Balance discharge protection function (i.e. Plug the balance charge connector into the balance discharge protection socket on ESC, in this case , the ESC monitor the voltage of whole battery pack AND the voltage of each cell)
For Li-xx battery£¬low / medium / high cut off voltage for each cell are: 2.6V/2.85V/3.1V. When the voltage of one cell in battery pack is lower than the cutoff threshold, the protecting program is activated.
We provide 2 kinds of Lithium Battery Balance Discharge Monitoring and Protecting socket for user to choose:
Socket #1
Socket #2
¡ñStartup mode: normal / soft / super-soft, default is normal startup.
¡ñTiming: low / medium / high, default is medium timing. In normal cases, low timing can be used for most motors. But for high efficiency, we recommend the Low timing for 2 poles motor and Medium timing for 6 poles and above. For higher speed, High timing could be used.
2.4 Full Protection Features: Low-voltage cutoff protection / over-heat protection / throttle signal lost protection.
3 Advantages
3.1 Military Standard Capacitor with extremely low resistance used on voltage input section, this will increase the ability of prevention of unwanted RF Noise/ Interference during flying.
3.2 Seperate PCB for control circuit and MOSFET circuit: adiabatic air gap between control circuit PCB and MOSFET circuit PCB reduces the heat exchange form MOSFET to control circuit, so the ESC works more reliable.
3.3 Extreme low resistance, super current endurance.
3.4 Microprocessor and BEC use separate voltage regulator IC, with good anti-jamming capability.
3.5 Compatible with Hobbywing's Program Card .
3.6 Own complete intellectual property rights.
3.7 Great innovation: First on earth with Lithium battery Balance Discharge Monitoring and Protecting Design.
