How To Wire a 230V SCG to a Century Variable Speed 270 Motor


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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 230V SCG when the VS270 is operating below the RPM threshold required for the SCG. A SCG configured to run on 115V is wired differently to the VS270.See "How To Wire a 115V SCG to a Century Variable Speed 270 Motor". Note: the AUX load feature in the VS270 can be used to power any other 230V unit (heater).

Step by Step


Step 1

TURN OFF POWER TO PUMP - Turn off electricity going to the pump motor at your circuit breaker. We assume that your pump has been installed and is operational, and that you are now adding at Salt Chlorine Generator to operate off the AUX Load relay in your pump.

Step 2

CHECK SCG CONFIGURATION - Check to see if your SCG is set up for 230V 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 230V to a SCG that is set up for 115V, you could damage the SCG.

Step 3

REMOVE POWER COVER - Remove the two screws that secure the cover over the power connections to and from the pump. Lift off the cover.

Step 4

REMOVE AUX POWER CAP - Remove the single screw on the cap that covers the control wiring for the pump. Lift off the cap to provide access to the AUX Load port.

Step 5

REMOVE BOX PLUG - Remove the steel plug in the side of the power box to allow access for the SCG cord.

Step 6

ADD JUMPER WIRE - All of the electrical terminals in the pump's power box are labeled. The Main power terminals are labeled "Ground" [using the ground symbol], "L1' and 'L2".The AUX Load terminal is labeled "1" and "2". Place a short 12 gauge jumper wire between "2" and "L1"

Step 7

INSERT SCG POWER CORD - Insert the free end of the SCG cord through the bottom hole where the steel plug was.

Step 8

STRIP ENDS OF SCG CORD - Strip a little less that 1/2" off the ends of the SCG cord.

Step 9

CONNECT SCG WIRE TO TERMINALS - Connect the black wire of the SCG to terminal "1" of the AUX Load terminals. Connect the red wire to the free side of the "L2" terminal. Connect the SCG ground wire under the ground screw as shown.

Step 10

REPLACE AUX POWER CAP - Replace the AUX power Cap and re-secure it with the single screw. Note: you may have to adjust the wires to have them fit under the bottom edge of the cap.

Step 11

REPLACE POWER COVER - Replace the Power Cover and secure it with the two screws.

Step 12

ROTATE SELECTOR KNOB TO "SETUP" - Move the Selector Know from "OFF" to "SETUP" to prepare for programming the AUX Load.

Step 13

TURN ON POWER TO VS270 PUMP - Turn on the power to the pump at the circuit breaker. The green LED power light on the pump should illuminate.

Step 14

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.

Step 15

PROGRAM MAXIMUM RUN TIME - The control can be programmed to limit the amount of 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

Step 16


Step 17

START PUMP - Rotate Selector Knob to "RUN" to start the pump.


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 Posted: 10/14/2017 

Gaetano - I would guess that your issue is in the programming of the Aux Load Relay. See Step 14 where you set the minimum ON speed. If you are running your pump at speeds below this value (default 2000 rpm), the SCG will turn off then come back on when your pump speed is programmed to run above the minimum ON speed.

 Posted: 10/13/2017 

cant operate it manually when timer comes on from clock setting it comes on and off than stays on for a while then goes off then on again. any idea whats causing it.