Tweco Merlin 6000 Slave PS - Manual (Page 16)

INTRODUCTION & DESCRIPTION 2-2 Manual 0-2570
3. Input Power
V o lt a g e F re q u e n cy P h a se A m p e ra g e
2 0 0 / 2 2 0 / 2 3 0 5 0 or 6 0 Hz 3 9 8 / 8 9 / 8 5
3 8 0 / 4 1 5 / 4 6 0 5 0 or 6 0 Hz 3 5 1 / 4 7 / 4 2
5 0 0 / 5 7 5 5 0 or 6 0 Hz 3 4 0 / 3 4
NOTE
Refer to Appendix 1 for recommended input wir-
ing size, current ratings, and circuit protection re-
quirements.
Amperage depends on input voltage (Refer to Ap-
pendix 1).
4. Output Power
Slave Power Supply:
50 to 150 amps
Total output of Master/Slave Power Supplies:
Continuously adjustable by potentiometer from
100 to 300 amps (Minimum of 50 amps if Slave
Power Supply is Turned OFF)
5. Duty Cycle (see NOTE)
NOTE
The duty cycle will be reduced if the primary in-
put voltage (AC) is low or the DC voltage is higher
than shown in the chart.
Ambient
Temperature
104° F (40° C)
Duty Cycle 100%
Current 150 Amps
DC Voltage 140 vdc
Power Supply Duty Cycle
6. Power Supply Dimensions
Enclosure Only -
Width: 24.12 in (0.61 m)
Height: 38.38 in (0.98 m)
Depth: 34.25 in (0.87 m)
Fully Assembled -
Width: 28.50 in (0.72 m)
Height: 43.38 in (1.10 m)
Depth: 43.75 in (1.11 m)
7. Weight of Power Supply Only
575 lbs (260.8 kg)
2.04 Theory Of Operation
A. Input and Output Power
The Power Supply accepts input voltages from 200 to
575V, 50 or 60 Hz, three-phase. Input voltages are set by
an internal changeover in the unit. The unit converts AC
input power to DC power for the main cutting arc. The
negative output is connected to the torch electrode
through the negative torch lead, and the positive output
connects to the workpiece through the work cable.
B. Main Cutting Arc
The Power Supply accepts 50 or 60 Hz three-phase line
input. An internal changeover switches input line volt-
ages in three ranges, for 200/220/230V, 380/415/460V,
or 500/575V operation. The power supply converts AC
input power to DC power for the main cutting arc. The
negative output is connected to the torch electrode
through the negative torch lead. The positive output is
connected to the workpiece via the work cable and clamp
connection.
C. Thermal Interlocks
The system has built-in thermal interlocks to provide safe
and efficient operation. When an interlock shuts down
the system, the torch switch (or control device) must be
used to restart the system.
Thermal overload sensors are located in the transformer
and main heatsink in the power supply. If one of these
components is overheated the appropriate switch will
open up, causing the temperature light to turn from green
to red and shutting off power to the main contactor. When
the overheated component cools down the switch will
close again and allow operation of the system.