14.3.11. Replacing Power Isolation Transformer (T1)

Preparation & Existing Transformer Removal for All ATevos:

• Shut down and lock out all power to ATevo.
• Remove safety shield.
• Disconnect battery and dc load(s) from DC Output Circuit Breaker (CB2+/-).
• Check with a voltmeter before proceeding, including any installed remote sense wires.
• Remove enclosure shroud.
• Disconnect X1 and X4 wires from Transformer (T1) at Power Board lugs.
• Disconnect Y1 and Y2 wires from Transformer at Power Board terminal block (A2-TB11).

For ATevos with Standard Input Transformer (no multi-tap option):

• Disconnect MOV Board (A9) from H1 and H5 primary leads by removing two (2) screws that connect H1 and H5 lugs to board.
• Disconnect H1 and H5 primary wires from AC Input Circuit Breaker (CB1-L1/L2).

For ATevos with Multi-tap Transformers:

• Disconnect H1, H2, H3, H4, and H5 primary wires from Multi-Tap Terminal Block (TB-H#).

New Transformer Installation for All ATevos:

	The Power Isolation Tansformer (T1) is extremely heavy. Be prepared to support its weight before proceeding.

• Remove four (4) screws at corners of the transformer mounting plate.
• Carefully lift the Transformer (T1) off of enclosure back wall.
• Position new Transformer (T1) with same orientation as existing, making sure mounting holes in plate align with holes in enclosure back wall.
• Install mounting screws in corners of transformer plate.

For ATevos with Standard Input Transformer (no multi-tap option):

• Route H1 and H5 primary wires to the AC Input Circuit Breaker (CB1-L1/L2), making sure that lugs for MOV board connection align with bolt holes in MOV board (A9).
• Install the two (2) screws through lugs that connect MOV Board to primary wires and tighten nuts.
• Insert ends of H1 and H5 primary wires into the AC Input Circuit Breaker (CB1-L1/L2) and tighten compression lugs.

For ATevos with Multi-tap Transformers:

• Route H1, H2, H3, H4, and H5 primary wires to associated terminals on Multi-Tap Terminal Block (TB-H#). Insert primary wires into labeled positions of terminal block and tighten screws.

For All ATevos:

• Route X1 and X4 secondary wires from Transformer (T1) to X1 and X4 lugs on Power Board (A2).
• Insert wires into lugs and tighten.
• Route Y1 and Y2 wires from Transformer (T1) to terminal block on Power Board (A2-TB11).
• Install wires into terminal block and tighten screws.
• Check your work.
• Replace safety shield and close the front panel door.
• Restart ATevo.