Installation Manual
19
FIELD WIRING
3-PHASE STEP-DOWN TRANSFORMER
WIRING
1. Make sure the transformer is fully installed and secured with
proper hardware.
2. Make sure all conduit routing is complete and terminated as
needed.
3. The stepdown transformer accepts a 3-phase input and has a
single phase output. The transformer primary connects to the
L1 and L2 terminals. L3 is not connected and wiring mains
power to L3 is optional. For sites with multiple operators,
loads must be evenly distributed between the 3 phases.
The stepdown transformer is dual input. It has separate
3-Phase terminals for 575Vac and 460Vac inputs. Only one
input voltage may be connected at time. Determine which input
voltage is to be used.
4. To connect a 575Vac input, remove ONLY the 575V 3-Phase
violator label. Connect 12-14awg wire to terminals 1 (L1), 2
(L2) and 3 (L3) (optional). Connect the earth ground to the
ground lug on the left side of the enclosure. (Fig. 1)
5. To connect a 460Vac input, remove ONLY the 460V 3-Phase
violator label. Connect 12-14awg wire to terminals 4 (L1), 5
(L2) and 6 (L3) (optional). Connect the earth ground to the
ground lug on the left side of the enclosure. (Fig. 2)
6. To connect a 240Vac output, remove the 230V violator label
and connect 12-14awg wires to terminals 7 (L) and 8 (N).
Connect an earth ground wire to the ground lug on the right
side of the enclosure. (Fig. 3)
7. Before connecting the output to the powerhead, apply power to
the transformer and ensure the output voltage at terminals 7
and 8 is 240Vac +/- 10%.
WARNING: Connecting 575Vac to the 460Vac terminals will
result in excessive high voltage at the transformer output and
damage the powerhead.
8. Remove power from the transformer and route the output
wires to the controller. Follow the instructions for connecting
single phase power and ground.
WARNING
575V
3-Phase
WARNING
460V
3-Phase
WARNING
230V
1-Phase
L1
L2
L3
WARNING
460V
3-Phase
L1
L2
L3
WARNING
575V
3-Phase
L1
L2
WARNING
460V
3-Phase
Orange Blue Yellow
GroundGround
Ground
Fig. 1
575V 3-PHASE INPUT
460V 3-PHASE INPUT
240V 1-PHASE OUTPUT
Fig. 2
Fig. 3