Westamp A6642-12 overview
Westamp A6642-12 Servo Amplifier, 2-Axis, 120 Volt Bus Voltage The A664 Amplifier consists of a close loop feedback amplifier which has a second close loop with...
Product details
Manufactured byWestamp
Product groupServo Amplifier
DescriptionWestamp A6642-12 Servo Amplifier, 2-Axis, 120 Volt Bus Voltage
OverviewThe A664 Amplifier consists of a close loop feedback amplifier which has a second close loop within the outer loop. Referring to the Block Diagram, analysis may begin at the signal input point at the left side of the page. The signal input comes to a summing point designated as a circle with a cross in it. The signal input and the tachometer input are of opposite polarity and are normally almost equal in magnitude. The difference between the signal input and the tachometer input becomes an error signal which is amplified in the amplifier designated Al.The output of Al is a command to the inner loop. The feedback to the inner loop summing point is from a motor current sense circuit which is sensing output current to a motor, Again there is an error signal which is the difference between the command and feedback signal. This error signal is amplified by A9.The amplified error signal from AO goes to two comparator modulators whose other inputs come from a triangle wave generator. If the A9 output goes positive, one comparator modulator puts out wider and wider pulses at the frequency of the triangle wave generator. If the AU output goes negative, the other comparator modulator puts out wider and wider pulses.One comparator modulator causes the motor to run in one direction. The other comparator modulator causes the motor to run in the other direction. Each comparator modulator goes to a fault gate and bridge driver which in turn drives the output bridge if no fault has occurred.The output bridge delivers rectangular voltage pulses to an external choke which in turn is connected to a motor. Because the choke has inductance, the motor current Increases while the voltage pulse is present and decreases while the voltage pulse is missing. The output bridge includes diodes which carry the motor current while the output transistors are turned off.The fault sensor measures current to the bridge from the power supply through a resistor. If excessive current is sensed, the fault sensor activates the fault gate and turns off the bridge.Other faults which may turn off the output bridge are due to exceeding the RMS output current, over temperature, low or high bus voltage, low bias voltage, short (internal/external), motor ground, and remote. Remote fault turns on whenever a fault occurs and may turn off other amplifiers in the system if the amplifiers are Interconnected properly. Usually if the Remote LED indicator is or by itself it indicates that this amplifier has beer shut down from an outside cause.
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Westamp
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Product group
Servo Amplifier
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