MDC Manual 1109KB - Red Lion Controls

SIGNAL WIRING
LEAD AND FEEDBACK FREQUENCY INPUTS
The Lead and Feedback Inputs have identical input circuitry. The Lead and
Feedback inputs each have separate DIP switches for setting the type of signal
input. A Magnetic Pickup or Logic Input signal can be sent to either input. When
a MAGNETIC PICKUP is used, the Sink/Source DIP switch, for the appropriate
input, must be in the “SRC” position for the frequency to be detected.
The Input schematic shows the details of the Lead and Feedback input
circuitry. Both inputs share the same common. Each input has two DIP
switches associated with it. The functions of these switches are as follows:
LEAD INPUT
SW1 - MAG: Sets input for a Magnetic Pickup signal.
Sensitivity: 200 mV peak;
Hysteresis: 100 mV
LOGIC: Sets input for a Logic signal.
Input trigger levels: VIL = 1.5 V max; VIH = 3.75 V min.
Note: SW2 Must be in the “SRC” position for a Magnetic Pickup signal.
SW2 - SNK: Provides a 7.8 K� internal pull-up resistor for sensors with
current sinking outputs.
SRC: Provides a 3.9 K� internal pull-down resistor for sensors
with current sourcing outputs.
FEEDBACK INPUT
SW3 - Same as SW1
SW4 - Same as SW2
Note: SW4 must be in the “SRC” position for a Magnetic Pickup signal.
Note: A Magnetic Pickup type sensor should not be used unless a large enough
signal is provided at all speeds of operation.
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