Red Lion GEMINI 33 - Manual (Page 32)

INSTALLATION & REMOVAL OF THE RELAY BOARD
To install the relay board, locate the relay opening at the lower right-hand
corner, on the back of the Gemini 3300. Pull the tab down while sliding the
board into the two slots in the housing. The relay board will seat into the unit,
allowing the tab to return to its original position. To remove the relay board,
pull down on the tab just enough to allow the relay board to slide out. Grasp
the terminal block and pull to remove the board.
NOTES:
1. SENSOR VOLTAGE AND CURRENT
The +12 V sensor supply voltage on the “DC OUT” terminal is nominal
with +/-25% variation due to line and internal load variations. All RLC
sensors will accommodate this variation.
2. HI/LO FRQ SELECTION
The HI/LO FRQ selection switch must be set on “LO FRQ” when switch
contacts are used to generate count input signals. Since 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 5
msec, and the count rate does not exceed 100 cps.
3. V
IL
and V
IH
levels given are nominal values +/-10% when counter voltage
on “DC OUT” terminal is +12 VDC. These nominal values will vary in
proportion to the variations in the “DC OUT” terminal voltage, which are
caused by line voltage and load changes.
4. When shielded cable is used, the shield should be connected to “COMM.”
at the counter and left unconnected at the sensor end.
5. Input B setup is identical to that of Input A. Input B is for logic inputs only.
6. Inputs A and B can accept source pulses from other circuits up to +28 V in
amplitude. For voltages above +28 V, a limiting resistor and zener diode
should be used to limit the voltage at the input.
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