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Transfer Switches - Eaton Cutler Hammer ATC-300 — Based Transfer Switch

For the Transfer Switches - Eaton Cutler Hammer ATC-300.

Applies to: Transfer Switches Eaton Cutler Hammer Atc 300

Before you start

  • HIGH VOLTAGES ASSOCIATED WITH OPERATIONAL TRANSFER
  • The ATC-300 Logic Controller provides the capability to set the
  • TO AVOID TOUCHING ELECTRICAL CONNECTIONS

Procedure

  1. Failure of Source 1 is detected by the controller intelligence.
  2. When the controller detects a failure, the engine contacts close (after delay if programmed) and start the engine-driven generator.
  3. When the Source 2 voltage reaches its operation rating, the K2 relay closes, starting the transfer operation. This operat­ ing sequence causes the contactor to open Source 1 and close on Source 2.
  4. The load is now transferred to the Source 2 power source.
  5. A return to the Source 1 power source begins when the volt­ age in all phases of a 3-phase sensing unit, or phase-to- phase in a single sensing unit, is restored to a preset value.
  6. At the preset voltage, the controller will cause the K1 relay to change state. This starts the return to the Source 1 power source.
  7. During this sequence, the contactor opens Source 2 and closes on Source 1.
  8. Simultaneously, the engine cool-down timer initiates the shut down of the engine driven generator.
  9. Transfer of the load back to the Source 1 power source is now complete. Section 6: Testing and Problem Solving
  10. No Load Engine Test;
  11. Load Engine Test; or
  12. Disabled. The factory default is set to:
  13. Load Engine Test a. After the Time Delay Engine Starting (TDES) has timed out, the engine should start, run, and build up to normal voltage and frequency. b. The transfer switch will transfer to the Source 2 power source after the Time Delay Normal to Emergency (TDNE) times out. Step 3: Initiate an automatic transfer operation back to the Source 1 power source by pressing the <Engine Test> pushbutton one time.
  14. After the Time Delay Emergency to Normal timer (TDEN) has timed out, the transfer switch will transfer back to the Source 1 power source.
  15. The Time Delay for Engine Cool-Off (TDEC - Feature 4) will allow the engine to run unloaded for a preset time after transfer to the Source 1 power source is com­ pleted.
  16. Alternate operational tests may be possible depending upon the options provided with any given ATS. Refer to the sche­ matic diagram provided with the ATS equipment, along with the specification nameplate, to determine the exact options provided.

Source: manual:ATC 300 2 pos Contactor ATS Instruction manual.pdf. Figures and steps are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.