Tweco A120 CutMaster - Manual (Page 24)

CUTMASTER A120
INSTALLATION Manual 0-4989 3-2
Most units are shipped from the factory with a 230 Volt input
power cable wired to the input contactor in the single - phase
configuration. The following illustrations and directions are
for changing that configuration to a different voltage and or to
three - phase operation or back again if a change had already
been made.
A. Cover Removal
1. Remove the upper and lower screws which secure the
cover to the main assembly. Do not loosen the lower
screws inside the cut out slots in the bottom of the
cover.
NOTE
The upper screws and lower screws are not the
same. Do not mix them. The upper screws are
for threading into the plastic of the front and rear
panels. DO NOT use the finer threaded lower
screws for this.
Art # A-08429
Lower
Screws
Lower
Screws
Slots
Upper
Screws
2. Carefully pull the Cover up and away from the unit.
B. Cover Installation
1. Reverse previous procedures for cover installation.
NOTE
When installing the upper screws, attempt to reuse
the original threads. The easiest way to do this is
by turning the screw counter-clockwise until you
feel the threads line up, then begin to turn the screw
clockwise to tighten. Do not over tighten.
C. Input Power Selection
Set the Input Voltage Selection Switch at the rear of the unit
based on the primary input voltage it is connected to. Low is
208/230 VAC and high is 460 VAC.
S
LO
HI
Art # A-08316
D. Quick Guide to Phase Wiring
The following illustration and directions are for changing phase
of the power supply.
Art # A-08493
Input Power Cable Connections
Three-Phase (3ø)
Store copper jumpers on base plate
Single-Phase (1ø) and Jumper Settings
GND
L1
L2
L3
L4
GND
L1
L2
L3
L4
Single and Three Phase Input Power Wiring
NOTE
There are two jumpers used for the single phase
230V setting and none for three phase.
E. Connections to Single Phase Input Power
WARNING
Disconnect input power from the power supply
and input cable before attempting this procedure.
These instructions are for changing the input power and or
cable on the 208/230, 400, 460 VAC Power Supply to Single -
Phase input power.
1. Remove the Power Supply cover.
See "A. Cover Removal".
2. Disconnect the original input power cable from the main
input contactor and the chassis ground connection.
3. Loosen the through-hole protector on the back panel
of the power supply. Pull the original power cable out
of the power supply.