Kaliburn SR-45i, User Manual

Page: 43 / 71

Maintenance and Troubleshooting SR-45i User’s Manual
220/380V 50 Hz TRANSFORMER CONFIGURATIONS
220V 50 Hz and 380V 50 Hz three phase power supplies are equipped with a dual
voltage main transformer TR1. To change the operating voltage for these
systems, perform the following procedures.
When the primary voltage of TR1
is changed, the control transformer TR3 must also be rewired for the correct
service voltage.
220V 50Hz Operation
For 220V operation, TR1 must be connected in a delta configuration. Install a
#10 AWG jumper wire from 220V on the first primary winding to 0V on the
second primary winding. Install a second #10 AWG jumper wire from 220V on
the second primary winding to 0V on the third primary winding. Install a third
#10 AWG jumper wire from 220V on the third primary winding to 0V on the first
primary winding. Connect the three phase primary power from the main
contactor CON2 to the 220V connection on each primary winding. See Figure 5-
2.
When the primary voltage of TR1 is changed, the control transformer
TR3 must also be rewired for the correct service voltage . For 220V operation,
connect the white wire of control transformer TR3 to TB2-13 and the brown wire
to TB2-14. Also, connect a wire (#20 AWG minimum) from the side terminal of
the rear panel fuse F1 to TB2-14.
380V 50Hz Operation
For 380V operation, TR1 must be connected in a wye configuration. Install a #10
AWG jumper wire from 0V on the first primary winding to 0V on the second
primary winding. Install a second #10 AWG jumper wire from 0V on the second
primary winding to 0V on the third primary winding. Connect the three phase
primary power from the main contactor CON2 to the 220V connection on each
primary winding. See Figure 5-2.
When the primary voltage of TR1 is
changed, the control transformer TR3 must also be rewired for the correct
service voltage
. For 380V operation, connect the white wire of control
transformer TR3 to TB2-13 and the brown wire to TB2-14. Connect the gray
wire of control transformer TR3 to the side terminal of the rear panel fuse F1.
5-5