Copley Controls Serial Encoder User's Guide Page 75

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CME 2 User Guide Command Inputs
Copley Controls 75
100% Duty Cycle Format (Two-Wire)
One input takes a PWM waveform of fixed frequency and variable duty cycle, and the
other input takes a DC level that controls the polarity of the output. A 0% duty cycle
creates a zero command, and a 100% duty cycle creates a maximum command level. The
command can be inverted so that increasing the duty cycle decreases the output and vice
versa.
Max +
0
PWM Input
Amplifier Output
Direction Input
100%
Duty Cycle
100%
Duty Cycle
Min -
Failsafe Protection from 0 or 100% Duty Cycle Commands
In both formats, the amplifier can be programmed to interpret 0 or 100% duty cycle as a
zero command, providing a measure of safety in case of controller failure or cable break.
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