PLANET BSP-300 - Manual (Page 28)

User’s Manual of BSP-300
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Appendix A: Glossary
(LVD) Low Voltage Disconnection
When the battery voltage is less than the value for low‐voltage disconnection, the controller will not
supply to the load so as to protect the battery from over‐discharge.
(LVR) Low Voltage Reconnection
When the battery is under the condition of low voltage disconnection, if the battery voltage is
recovered and higher than the value for low voltage reconnection, the low‐voltage circuit
disconnection will be lifted and the connection is restored.
(ACV) Absorption Charge Voltage
When the battery voltage achieves the value of absorption charge voltage, the controller will
maintain this voltage and charge for a period of time which will not cause excessive charging of the
battery.
(FCV) Float Charge Voltage
When the battery charge completes the charging process, its voltage will drop to a float charge
voltage and maintain at this voltage with a minimal charging current for supplemental battery
charging.
(PWM) Pulse Width Modulation
There are many applications of PWM, such as motor control, servo control, light dimming,
switched mode power supply, and even some audio amplifiers. In the DC motor control system, in
order to reduce the current flowing through the motor coil and the power consumption, the pulse
width modulation (PWM) is often used to control the on‐ and off‐time of the switched power
component. Its most common application is to change the speed of the motor by changing the
output pulse width or frequency.
When the power supplied to the motor is controlled ON and OFF periodically at a fixed duty cycle,
the longer the ON state takes, the faster the motor speed is; on the contrary, for a longer OFF state,
the motor speed will be slower. This kind of motor speed control method by adjusting the ratio ON
and OFF states is called pulse width modulation. The ratio of the ON state in a period is referred to
as the duty cycle, expressed as a percentage.