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Read and become familiar with these instructions before doing installation.
1. Install STP per STP/IST Fixed and Variable Length Installation and Owner's Manual.
2. Remove cover of STP-SCI and mount base to wall or other surface.
Note: The STP-SCI must be mounted indoors and can operate at ambient temperatures between 40°and105° F (4°-41°
C).
3. Connect input power of 208-240 VAC to L1 and L2 and Ground wire to terminals per Figure 2.
4. Connect dispenser hook signal to terminals, 110-250V supply and return per Figure 2.
5. Using an ohmmeter, verify the motor leads (M1 and M2) are not shorted to ground.
Damage to the STP-SCI may occur if motor leads are shorted together or to ground and power is
Warning
applied.
6. Connect motor leads to M1 and M2 and Ground wires to terminals per Figure 2.
7. For Stand Alone controller configuration set SW1 and SW2 poles 1-8 per Figure 1(Stand Alone configuration is
Factory setting).
For Master-Slave and/or Alternating Circuit configurations, go to "Master-Slave/Alternating
Circuit" section, step 9.
8. All STP-SCI controllers must be calibrated. Continue to step 14 "Calibration" section to complete installation.
MASTER-SLAVE/ALTERNATING CIRCUIT
The Master-Slave feature allows the master to turn on additional STP's when the first STP operating needs help due to
loading (flow rate) or an abnormal condition exists. The Alternating Circuit (AC) feature continuously alternates the lead
pump, thus turning on a different STP each time all dispensers are shut off and at least one dispenser is turned back on.
The Master-Slave/AC configuration combines the features of the Master-Slave and AC functions.
Note: • STP-SCI is not compatible with the STP-SC or the STP-SCB in Master-Slave, Alternating Circuit configurations.
• Master-Slave will not work with PMA33, PMA75B (50 Hz PMA), or PMAH150B (50 Hz PMA).
9. Wire STP-SCI controllers according to Figure 3 for Master-Slave, Figure 4 for AC or Figure 5 for Master-Slave & AC
Configurations. Connect Communication cable, RS 485, to terminals (+, G, and –) wire "+" together, "G" together and
"-" together then wire the shielded cable drain wire to Ground (G) at one end only, Use at least 22 AWG three
conductor shielded cable with drain wire.
10. Connect dispenser hook signal to the STP-SCI designated as Master per Figures 3,4, and 5.
Note: Be sure L1, L2, M1, M2 and Grounds are installed at each STP-SCI.
11. Configure Master-Slave and Alternating Circuit features by setting SW2 poles 3 and 4 per Figure 1.
12. Create an address for each controller by setting SW1 poles 1-5 per Table 1. Each Controller must have its own
unique address.
13. Attach cover of controller to base and complete the "Calibration" section of the installation manual, step 14.
Note: There can only be one Master in a system and up to 31 slaves.
CALIBRATION
Note: Before calibration process can begin, fuel level in tank must be above the motor intake
1. It is recommended to close either the STP clamp valve or a ball valve at the STP discharge. Turn on power supply to
the STP-SCI. The green light indicator will come on steady, the red light indicator will flash eight times and the
audible alarm will beep eight times. This indicates the STP-SCI is Uncalibrated.
2. Put the controller in calibration mode by pressing and holding the reset button, the push-button on the right side of
the control box, until all three light indicators blink alternately. This will take approximately 10 seconds. Release the
reset button. For Master Slave and Alternating Circuit configurations put the master and all the slaves into
calibration mode before going to step 3.
3. Lift a handle on a dispenser to turn the pump on. After approximately 16 seconds the controller will take a "snapshot"
of the voltage, current and power. The three lights will quit alternating and only the green light will remain flashing.
This indicates the calibration is complete and the dispenser handle can be turned off. Remember to open the STP
clamp valve or ball valve when calibration is complete. If the controller does not calibrate the red light will flash and
INSTALLATION INSTRUCTIONS
3
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