Voltage Change : Sentra Temperature Control Units Manufactured Prior January 1, 2011

  • A qualified field technician can convert the voltage on most standard Advantage Sentra "SK" temperature control units.
  • Contact the Advantage Service Department with your unit serial number that your unit can be converted.
  • After confirming that your unit can be converted use this document as a quide to making the voltage change.
  • This document outlines the steps required to change the voltage from 230 to 460 or from 460 to 230 for units manufactured prior to approximately January 1, 2011.
  • Refer to fyi document #311 for voltage conversion instructions for units manuactured after January 1, 2011.
  • Assistance is available during business hours from the Advantage Service department at 317-887-0729. Contact Advantage for other power supply requirements.
  • Shown below is a typical electrical panel for Sentra temperature control units manufactured prior to January 1, 2011.
  • Typical electrical panel for Sentra units manufactured prior January 1, 2011
  • Voltage Conversion Procedure

  • For a field voltage conversion, the following items will required replacement or rewiring. Contact the Advantage Service Department for the proper replacement parts.

  • Heater Element (rewire)
  • Pump Motor (rewire)
  • Transformer (rewire)
  • Overload (replace)
  • 1. Disengage process operations according to the procedure outlined in section 3.4 of the operations manual.
  • Typically, this requires reducing process temperature below 55°F, discontinuing operations and dissipating all system pressure.
  • Follow proper lock-out/tag-out procedures to disengage the main electrical power supply.
  • 2. Remove the stainelss steel lift-off cover panel.
  • 3. Locate the heater.
  • Diagram showing new heater wiring schematic for Sentra units manufactured prior January 1, 2011
    Figure A
  • Most Sentra units use a single heater mounted in the discharge cylinder.
  • Some units may use a heater in both the discharge and suction cylinders.
  • Note that all heaters must be rewired.
  • Remove the cover plate to the heater junction box and note the current wiring installation. The new installion is show in Figure A.
  • 4. Open the electrical panel cover to locate the electrical motor.
  • For convenience and greater access area, the panel cover support straps and the instrument cables can be removed so the cover opens flat.
  • Most Sentra pump motors are dual voltage. Note the current installation and the new installation according to Figure B.
  • Diagram showing new pump wiring schematic for Sentra units manufactured prior to January 1, 2011
    Figure B
  • 5. Locate the transformer mounted on the electrical panel.
  • Note the current installation.
  • A schematic printed on the transformer body details the new installation.
  • Diagram showing new transformer wiring schematic for Sentra units manufactured prior to January 1, 2011
    Figure c
  • 6. Locate the motor overloads.
  • The three overloads must be replacw with a set sized for the new voltage.
  • Simpy unscrew the old set of overloads and replace with the new set.
  • Typical motor overlaods for Sentra units manufactured prior to January 1, 2011
    Figure D
  • Once a voltage conversion is complete be certain the unit is properly connected to the new voltage supply as outlined in the operations manual. Restart the unit according to the operations manual.

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