Chapter Four: Operation
How To Use the Reverse Limit Switch Option
35
How To Use the Reverse Limit Switch Option
The Reverse Limit Switch Option (RLSO) is incorporated in the 252 controller to provide for
valves that have limit switches which are closed when the valve is in the center of it’s operating
range. The limit switches open when the valve reaches the appropriate end. The standard 252
controller is set up for limit switches that close when the valve reaches the appropriate end.
The RLSO simply inverts the logic signals from the limit switches. The RLSO P.C. board is
installed inside the 252 controller where the valve cable plugs into the main P.C. board.
No external adjustments are needed. The standard VALVE connector on the rear panel is used
with the same pin assignments as the standard unit (refer to Table 1, page 15, for the Valve
connector pinout).
Note that if no cable or valve is connected to the unit, both the fully OPEN and CLOSE lights
will be on and the 252 controller does not put out any drive pulses. For troubleshooting, either a
valve will have to be connected, or the VALVE connector Pins 10 and 11 will have to be
connected to Pin 12.
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