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Connect the IMB Signal Cables in a Simplified 1+1 Parallel System

NOTE: Route the signal cables separately from the power cables to ensure sufficient isolation.
  1. Remove the static switch module from both UPSs.

    Front View of the UPS

  2. Remove the cover from both UPSs.

    Front View of the UPS

  3. Disconnect the signal cables from the internal maintenance breaker IMB indicator light on both UPSs.
  4. Remove the shelf from both UPSs.

    Front View of the UPS

  5. Remove the front cover from the internal maintenance breaker IMB on both UPSs.

    Front View of the UPS

  6. Install an additional AUX switch (provided) in the OF2 position in the internal maintenance breaker IMB on both UPSs.
  7. Connect the non-Class 2/non-SELV signal cables between the two UPSs:
    1. Connect the non-Class 2/non-SELV signal cables (not provided) from the AUX switch terminal 1 and 2 in the internal maintenance breaker IMB in UPS 1 to J6614-5 and J6614-6 on board 640-4843 in UPS 2 as shown.
    2. Connect the non-Class 2/non-SELV signal cables (not provided) from the AUX switch terminal 1 and 2 in the internal maintenance breaker IMB in UPS 2 to J6614-5 and J6614-6 on board 640-4843 in UPS 1 as shown.

    Front View of Internal Maintenance Breaker IMB

    Front View of Simplified 1+1 Parallel System

  8. Reinstall the front cover on the internal maintenance breaker IMB on both UPSs.
  9. Reinstall the shelf on both UPSs.
  10. Reconnect the signal cables from the internal maintenance breaker IMB to the indicator light on both UPSs.

    Front View of the UPS

  11. Reinstall the cover on both UPSs.
  12. Reinstall the static switch module on both UPSs.
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