CONTREX CX-1200 - Manual (Page 112)

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STANDARD SIGNALS
The Standard Signals screens consist of the Lead Frequency Input screen (page 1), the Feedback Frequency
Input screen (page 1), and the Control Output screen (page 2).
Lead Frequency Input
The Lead Frequency Input signal is a frequency from the quadrature sensor for the lead motor. PPR FI1
(CP-261) scale the Lead Feedback signal from frequency (pulses per second, Hz) to FI1 RPM (MP-02).
Feedback Frequency Input
The Feedback Input signal is a frequency from the quadrature sensor for the follower motor. PPR FI2 (CP-
266) scale the Follower Feedback signal from frequency (pulses per second, Hz) to FI2 RPM (MP-04).
Control Output
The Control Output Signal (CO_Sig) is the low voltage output signal that is the control (or command) signal
input to your drive. CO_Sig typically represents a speed command since the majority of drives operate in the
velocity mode.
The CO Offset (CP-273) is calibrated at the factory and generally will not need to be re-calibrated in most
applications. The CO Offset is added to the control output signal in order to zero (or balance) any offset
voltage that may be present in the output circuitry. It can be used to counteract a creep problem with the
drive, if a drive balance pot (or digital adjustment) is not available. When operating the CO_Sig in bipolar,
unipolar or bipolar absolute mode, the CO Offset should be set to zero the CO_Sig output voltage. Refer to
Drive Setup/Calibration: Creep Calibration for more details.