Red Lion LEGEND - Manual (Page 41)

SIGNAL WIRING (Cont’d)
INPUTS A & B (Cont’d)
INPUT A
SW1 - MAG: Sets input for a Magnetic Pickup signal.
Sensitivity: 200 mV peak; hysteresis: 100 mV.
Note: SW2 and SW5 must be in the “SRC” position for a Magnetic Pickup signal.
LOGIC: Sets input for a Logic signal.
Input trigger levels: V
IL
=1.5 Vmax; V
IH
=3.75 Vmax.
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.
SW3 - HI FRQ: Removes damping capacitor and allows operation up to the
max. frequency.
LO FRQ: Connects damping capacitor for switch contact debounce.
Limits count speed to 50 cps max. Min. count pulse ON or OFF
time - 10 msec.
Note: The HI/LO FRQ selection switch must be set on “LO FRQ” when switch
contacts are used to generate count input signals. The “LO FRQ” mode
also provides very high immunity against electrical noise pickup, it is
recommended that this mode also be used, whenever possible, with
electronic sensor outputs. The “LO FRQ” mode can be used with any type
of sensor output, provided count pulse widths never decrease below 10
msec, and the count rate frequency does not exceed 50 cps.
INPUT B
SW4 - Same as SW1
SW5 - Same as SW2
SW6 - Same as SW3
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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