Minuteman Continuous Power Series Owner's Manual page 29

Transformer
Ground
Neutral
IL3
OL3
Line 1
IL1 OL1
Line 2
IL2 OL2
Neutral must be connected. Failure to do so can damage the unit.
1
Used for two-phase units only
2
UPS
1
IL3
OL3
IL1
OL1
2
IL2
OL2