American Power Conversion SYMSTRF3I Bypass Balance Transformer Wiring Procedure Optional

Bypass Balance Transformer Wiring Procedure (Optional)

1.Remove the transformer wiring panels on the SymmetraTM frame, and on the back of the transformer.

2.Move the jumper bar on the frame terminal block up one position. See illustration.

3.Pull the wire through the conduit. Leave enough wire extending from the conduit strain relief to reach terminal blocks.

Note: The input wires must not be in the same conduit as the output wires. See wiring schematic.

4.Attach flexible metal conduit to the SymmetraTM wiring panel and to the transformer frame . Remount the wiring panel onto the SymmetraTM frame.

5.Strip approximately 1/2” (13 mm) of insulation from the end of each wire.

6.Connect the ground wire to the green/yellow grounding terminal block connection.

7.Connect the neutral wires to terminal block connections marked “N” in blue.

8.Connect remaining power wires to terminal block connections.

9.Inspect wiring to ensure proper connections.

Caution!

νFasten connection screws to ensure good electrical connection.

10. Remount the wiring panels onto the
SymmetraTM frame and the transformer.
11. Switch the bypass circuit breaker to the on
(I) position and install the cover plate over it.
See illustration.
Note: Installing the bypass transformer option
removes the bypass circuit breaker from the
power path.
Wiring	Symbol	Description	Minimum
			Wire Gauge

1	Output Phase	3		Output Power
2	Output Neutral		N	Output Return (Blue)	#3 AWG (25mm2)
3	Safety Ground			Safety Ground (Green/Yellow)
A	Input Phase	L2		Input Power
					#8 AWG (10mm2)
B	Input Phase	L1		Input Power

990-7166-001 Electrical Installation - Page 9