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ST-4125D/ST-6125D SUBMERSIBLE PUMPS — OPERATION AND PARTS MANUAL — REV. #1 (06/12/08) — PAGE 15
ST-4125D/ST-6125D — 230/460 VAC VOLTAGE SELECTION
230/460 VAC Voltage Selection
The ST-4125D/ST-6125D submersible pump is factory set
at 230 VAC. To change the voltage from 230 VAC to 460
VAC, perform the following (refer to Figure 5):
1. Place pump in a suitable area free of dirt and debris.
2. Remove the four retaining screws, using a 19 mm socket,
and the two Allen screws using an 8 mm socket, that secure
the pump casing.
3. Lift the top of the pump by attaching a chain on the eye
bolts and using a crane or similar equipment. Be careful
not to fully stretch the cable connections inside the pump.
4. Cut the tie-wrap holding the 460 VAC motor winding wires
as shown in Figure 5. Then remove the protective covering
from the wires (labeled 4, 5, and 6).
5. Remove the sleeving covering the large red wire and
separate the 2 wires labeled 1 and 7.
6. Connect the wire labeled 4 from step 4 to the wire labeled
7 from step 5 and join them with the large red wire. Cover
the wires with sleeving.
7. Repeat steps 5 and 6 for the large black wire and the large
white wire. Refer to the table in Figure 5 for wires to separate
(column 2) and wires to connect (column 4).
8. Using electrical tape, bind the 3 wires that were separated
and disconnected (labeled 1, 2, and 3). Place these wires
neatly inside the housing.
9. Reinstall the top of the pump and reinsert the six screws
and tighten securely.
Figure 5. 230/460 VAC Pump Voltage Selection
3
9
8
7
1
2
4
5
6
BLACK
9
3
RED
WHITE
(LARGE)
GREEN
2
1
8
7
230 VAC
MOTOR
WINDINGS
230/460 VAC
MOTOR
WINDINGS
COMMON
4
5
6
460 VAC
MOTOR
WINDINGS
WHITE
(SMALL)
BLACK
(SMALL)
BLACK
(SMALL)
W
Z
X
Y
V
9
8
U
7
MOTOR
WINDING
STAR WITH
NEUTRAL
230 VAC
(LOW VOLTAGE)
460 VAC
(HIGH VOLTAGE)
MOTOR
WINDING
STAR WITH
NEUTRAL
9
W
Z
8
Y
V
7
X
U
REMOVE PROTECTIVE
COVERING TO GAIN
ACCESS TO 460 VAC
WIRES 4, 5, AND 6.
REMOVE SLEEVING
230 VAC
INPUT 3Ø
U (RED)
V (WHITE)
W (BLACK)
MOTOR
WINDINGS
1AND 7
2AND 8
3AND 9
460 VAC
INPUT 3Ø
U (RED)
V (WHITE)
W (BLACK)
MOTOR
WINDINGS
4AND 7
5AND 8
6AND 9
MOTOR WINDING CONFIGURATION
NOTE
PUMP IS SHIPPED FROM THE FACTORY FOR 230 VAC OPERATION.
FOR 460 VAC OPERATION SEEABOVE WIRING ILLUSTRATIONAND TABLE.
CONNECT
TO GROUND
SCREW IN
UPPER CASING
CUT
TIE-WRAP