Eaton Cooper Power Series Installation, Operation And Maintenance Manual

Also see for COOPER POWER SERIES: Installation and operation instructions Installation instructions Installation instructions Installation and operation instructions Operation instructions

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Eaton Cooper Power Series Installation, Operation And Maintenance Manual Manual pdf 28 page image

8. Program the control as required for the new systemvoltage:a. Set FC 41 to for the system configuration (Wye, DeltaLeading, Delta Lagging).b. Set FC 43 to the desired Load Volts.c. Set FC 44 to the Overall Pot. Ratio as shown on thenameplate for the corresponding Load Volts or asdetermined for voltages other than shown on thenameplate.d. Set FC 44 to the Internal PT Ratio as shown onthe nameplate for the corresponding Load Volts oras determined for voltages other than shown on thenameplate.9. Complete any other programming as required. Refer toTable 3 and Table 4 for guidance on typical settings.Allowable system voltages and calculation of overallPT ratioIf the system voltage is other than those listed on thenameplate, it can be determined if there is sufficient ratiocorrection available from the control winding (internal PT)taps and the Ratio Correction Transformer (RCT) taps toallow the CL-7 control and motor to function properly. Thegeneral guideline is that the overall PT ratio is sufficient ifthe voltage delivered to the control for the nominal voltageconditions is in the range of 115–125 V.To determine the voltage delivered to the control, use thefollowing procedure:1. Calculate the desired PT ratio.Desired PT Ratio = Desired system voltage ÷ 120 V2. Choose the internal PT ratio on the nameplate closestto the desired PT Ratio.3. Calculate the actual voltage at the output of the internalPT.Internal PT Output Voltage = Desired system voltage ÷Selected Internal PT Ratio4. Choose the RCT tap (133, 127, 120, 115, 110, 104)closest to the internal PT output voltage.5. Given the RCT input tap, use Table 5 to determine theRCT ratio.6. Calculate the control input voltage.Control Input Voltage = Internal PT Output Voltage ÷(RCT Ratio)7. Calculate the overall PT ratio.Overall PT Ratio = Internal PT Ratio x (RCT Ratio)EXAMPLE: If a 60 Hz, 7620 V regulator is to be used on asystem with a nominal voltage of 2500 V, the following isdetermined:1. 2500 V ÷ 120 V = 20.82. Choose 20:1 for the internal PT ratio.3. Internal PT output voltage = 2500 V ÷ 20 = 125 V4. Best RCT input tap is 127.5. RCT ratio is 1.058.6. Control input V = 125 ÷ 1.058 = 118 VThis is within allowable range.7. Overall PT ratio = 20 x 1.058 = 21.2:1Table 5 RCT ratiosRCT Input Tap RCT Ratio133 1.108127 1.058120 1.000115 0.958110 0.917104 0.86722INSTALLATION, OPERATION, AND MAINTENANCE INSTRUCTIONS MN225003EN April 2018CL-7 Voltage Regulator Control