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1 <br /> MASTER-SLAVE/ALTERNATING CIRCUIT <br /> Note: RS 485 Connection is only required if Master-Slave or Alternating Circuit operation is desired. <br /> Note: Be sure L1, L2, L3; M1, M2, M3 and Grounds are installed at each STP-SCIII. <br /> The Master-Slave feature allows the master to turn on additional STP's when the first STP operating needs help due to <br /> loading (flow rate) or an abnormal condition exists. The Alternating Circuit (AC) feature continuously alternates the lead <br /> pump, thus turning on a different STP each time all dispensers are shut off and at least one dispenser is turned back on. <br /> 1. (Fig. 2) Connect RS 485 (+, G, & —) to terminals. Connect drain wire of shielded cable to Ground (G) at one end <br /> only. Wire per NFPA 30A and NFPA 70. For the signal wires, use 18 AWG 3 conductor cable (300V min.), with <br /> conductors twisted and within a common jacket. Cut wires to length so that there is no excess wire touching circuit <br /> board components. <br /> 2. (Fig. 2) Connect hook between STP-SC's. <br /> 3. Set Master-Slave and Alternating Circuit features on (SW1) poles 1-3 per Table 2. <br /> 4. Set(SW1) poles 6-8 per"Table 1". The address must beset for each STIP-SCIII. <br /> 5. Attach cover of controller to base. Then go to the "Calibration" section to complete the installation. <br /> Always replace the cover of the STP-SCIII before applying power. Failure to do so could result in <br /> Warning A severe injury or death. <br /> Note: There can only be one Master in a system and up to 7 slaves. <br /> <� <br /> y <br /> Ali r4 <br /> SW1-Pole 1 in the ON position = selected <br /> Figure 1 <br /> 4 <br />