In general, a Salt Chlorine Generator (SCG) is designed to only operate when water is flowing (pump on) and when the water is flowing at an acceptable flow rate. This could be seen as a problem with a variable speed pump. When the pump is operating below the operating RPM threshold required for minimum water flow, the SCG should be turned off. The Century 270 Variable Speed (VS270) motor has a built-in Auxiliary Load relay that can be programmed to control the operation of a SCG. This guide shows you how to wire and program the Century 270 Variable Speed (VS270) motor to turn off a 115V SCG when the VS270 is operating below the RPM threshold required for the SCG. A SCG configured to run on 230V is wired differently to the VS270. See "How To Wire a 230V SCG to a Century Variable Speed 270 Motor". Note: the AUX load feature in the VS270 can be used to power any other 115V unit (heater).
CHECK SCG CONFIGURATION - Check to see if your SCG is set up for 115V operation. If you have a Compupool SCG, see pages 13 and 14 of our guide on "How To Install an In-Line Salt Chlorine Generator" for specific information. For all other SCGs, check the owner's manual. If your AUX Load relay sends 115V to a SCG that is set up for 230-V, your SCG will show an error in its display panel
CONNECT SCG WIRES TO AUX TERMINALS - Connect the black wire from the 115V supply cable to terminal 1 of the AUX Load Relay. Connect the black wire from the SCG cable to TERMINAL 2 of the AUX Load Relay. Connect the ground from the 115V to the GREEN GROUND screw inside the Century 270VS terminal box. Connect the WHITE wire from the 115V supply cable to the white (or red) wire in the SCG cable. Note: We are showing the breakout of the individual wires for illustrative purposes. For a proper installation, you should bring the 115V supply cable and SCG cable into a separate junction box. Then bring the black lines out to the Aux Load
Relay. And connect the white lines inside the junction box.
PROGRAM MINIMUM SPEED - The control is designed to turn on the AUX Load relay when the pump speed is above the MINIMUM ON SPEED (default is 2000 RPM). The Aux Load relay will stay closed as long as the pump's RPM is above the programmed MINIMUM ON SPEED. To set this limit, 1- press the right arrow one time to change to AUX Load settings. Then 2- press "SET" to enter the "change mode". 3- Press "+" or "-" to increase/decrease the MINIMUM ON SPEED. Now set the MAXIMUM RUN TIME below.
PROGRAM MAXIMUM RUN TIME - The control can be programmed to limit the amount of time the AUX Load relay is closed in a 24-hour period. For example, if the pump runs at 3000 RPM for 8 hours and the AUX Load is programmed to run for a maximum of 6 hours, the relay will open after 6 hours. MAXIMUM RUN TIME is set right after setting MINIMUM ON SPEED. 1- Press the right arrow to change to MAXIMUM RUN TIME. Then 2- press "+" or "-" to increase/decrease the MAXIMUM RUN TIME