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Servos put high peak power demands on the power supply. The easiest and best way to build a power supply to deliver and absorb pulses of peak power is for the supply to have an appropriately-sized output capacitor. Capacitance Requirements 3/9 ARMS DC S200 6/18 ARMS DC S200 2,000 µf / drive at 75 V bus 4,000 µf / drive at 75 V bus 4,000 µf / drive at 48 V bus 8,000 µf / drive at 48 V bus 16,000 µf / drive at 24 V bus 32,000 µf / drive at 24 V bus This can be the output capacitor of an unregulated power supply or a capacitor in parallel with the output of a regulated supply. In most cases, this capacitor does not need to be close to the drive, so a single capacitor can be shared by multiple drives.
This capacitor does several jobs: 1. Bus capacitance absorbs net regenerated mechanical energy from the inertia when the motor decelerates. If the bus capacitance is sufficient, regeneration causes a controlled, limited rise in bus voltage and the over-voltage fault is not tripped. NOTE If the regenerated mechanical energy is high, additional bus capacitors can be added in parallel. The bus capacitance can be increased almost without limit. NOTE The over-voltage fault is a non-latching fault that turns off the inverter transistors when the bus voltage is above the over-voltage threshold. An over-voltage fault trip interrupts the regeneration of mechanical energy back to the bus. This limits the bus voltage rise and protects the drive. However, it interrupts motor torque, so the machine cycle is affected. In most cases it is undesirable to allow the bus voltage to pump up to the over-voltage fault threshold. In many applications, much or all of the rotational mechanical energy is dissipated as heat in the motor windings when the motor decelerates. The maximum regenerated rotation energy back to the bus occurs (counter-intuitively) during a low torque deceleration from high speed. In this case, the resistive losses in the motor are low. If mechanical drag is low, much of the stored rotational energy is regenerated to the bus. 2. Bus capacitance absorbs net regenerated inductive energy from the motor winding when the drive is disabled or faulted. The worse case, regenerated inductive bus voltage rise is a trip of the bus over-voltage fault when decelerating the motor at full torque. Tripping the bus over-voltage fault, while stopping the flow of regenerative mechanical energy back to the bus, causes a fraction of the inductive energy stored in the windings to regenerate to the bus, causing the bus voltage to go higher than the over-voltage threshold. If there is insufficient bus capacitance to absorb this energy, the bus voltage rise is excessive and can damage the drive. NOTE Failure to provide adequate external capacitance on the main bus can damage the drive. The regeneration of motor inductive energy allows some pump up of the bus voltage above the bus over-voltage threshold. 3. Bus capacitance improves motor dynamics by holding the bus voltage stable during acceleration.
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