Install the Internal Backfeed Kit for IEC (GVLOPT004) in a Single Mains System

Remove the transparent plastic protectors (marked (A) on the illustration) from the busbars. If present, remove the plastic box (marked (B) on the illustration). Save all parts for reinstallation.

NOTE: On newer UPS models, the box (marked (C) on the illustration) is integrated in the inner door of the UPS instead of being a separate part. The integrated box must not be removed from the inner door. The integrated box does not need modification to fit with the backfeed kit.

Front View of the UPS Model with Separate Plastic Box and the UPS Model with Box Integrated in the Inner Door

Remove the input busbars (880-63263 and 880-60622), the bypass busbars, and the single mains busbars. Save the input busbars (880-63263 and 880-60622) for reinstallation and save the bypass busbars and single mains busbars for later use.

Only for UPS with the plastic box as a separate part: Cut away the K zone parts on the plastic box. After cutting, the plastic box will be in two pieces. Skip this step if the box is integrated in the inner door of the UPS.

Install the backfeed kit frame (0N-74138). Connect the small bracket (870-64963) from the backfeed kit frame to the corner pillar of the UPS. Use the provided M6x16 screws and M6 nuts.

Only for UPS with the plastic box as a separate part: Reinstall the two plastic box pieces (marked (B) on the illustration). Skip this step if the box is integrated in the inner door of the UPS.

Install the busbars:

Install the six backfeed kit busbars (880-63418, 880-6239, 880-63422, 880-63417) and the insulation part (850-10163) on the backfeed kit frame and connect to the busbars in the UPS.
Install the input busbars (880-63263 and 880-60622) and the service measurement boards (880-63416 and 0N-87864) on the backfeed kit frame. The input busbars were removed from the UPS in step 2.

Rear View

Follow the UPS installation manual to connect the power cables. Note that the input busbars are now located on the backfeed kit assembly.

Disconnect the preconnected signal cables from the existing service measurement boards on the side of the static bypass switch. Connect the signal cables to the new service measurement boards on the backfeed breaker. The signal cables will make a click when connected properly.

Front View

Remove the system level controller and disconnect the preconnected signal cables 0W13234 and 0W13276 from board 0P4828.

Connect the provided signal cable 0W13274 to the signal cables 0W13234 and 0W13276. Reinstall the system level controller and fasten with the three screws.

Remove the front cover from the backfeed breaker.

Connect the two wires in the signal cable 0W13274 labeled BF_AUX to terminal 1 and 4 on the AUX contact (normally open NO) in the backfeed breaker. The position of the AUX contact is marked with an (A) in the illustration.

Connect the wires labeled BF_Coil_+ in 0W13274 to the C2 terminal in the backfeed breaker. Connect the wires in 0W13274 labeled BF_Coil_- to the C1 terminal in the backfeed breaker. The terminals for the shunt trip coil are marked with a (B) in the illustration.

Reinstall the front cover on the backfeed breaker.

Reinstall the transparent plastic protectors (marked (A) on the illustration) in the original position. The transparent plastic protectors were removed in step 1.

CAUTION
Risk of electric shock The transparent plastic protectors must be reinstalled in the original position. Failure to follow these instructions can result in injury or equipment damage.

Remove the plate in front of the backfeed breaker from the inner door of the UPS. Install the replacement plate 870-65048 provided in the kit.

Place label 885-91965 (provided with the UPS) on the front of the inner door of the UPS near the backfeed breaker.