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3. The main power transformer is located at the bottom-right corner of the con-
trol cabinet. This transformer supplies Single Phase 115V power to the cabi-
net. It also has two different input connections located at terminal board TB2.
If the incoming power is 187-215 VRMS, connect wire 74 to the 208V position
(center). If the incoming power is 216-250 VRMS, connect wire 74 to the 240V
position (left).
4. Turn the main circuit breaker to the ON position (rotate the shaft clockwise).
Apply power to the control by pressing the Power-On switch on the control
panel. Verify that the Fault Indicator on the 320V Power Supply (located above
the main power transformer) displays the number "1", which signiies a normal
power-up sequence. Next, verify the DC bus voltage on pins 6 & 7 with a volt-
meter. The voltage should read approximately 335VDC if powered from 240V,
or closer to 290V if powered from 208V. If the voltage is not at least 260VDC,
call the Service Department. This voltage will not be displayed on the diagnos-
tic data page of the display.
5. Turn the main circuit breaker OFF by rotating its shaft counterclockwise.
Close the door, lock the latches, and turn the power back on.
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peration
The Mini Mill operates the same as the other Haas Vertical Machining Centers,
with the exception that the spindle motor is driven by an ampliier on the Servo
Drive assembly. A closed-loop Vector Drive function is still performed, with the
ampliier being controlled by the C-Axis output of the Mocon, as is the same for
other Haas machines. The ampliiers get their 320V power from a power supply
specially designed to operate eficiently from either Single Phase or 3 Phase
power.
The 320V Power Supply limits the inrush current into the supply at power-on,
and continuously monitors the input voltage for a drop-out condition. It also
provides the drive to the 15 Ohm Regen Load mounted on top of the cabi-
net. It does this by sensing the voltage as the spindle motor decelerates and
connecting the Regen Load across the 320V output bus to absorb the excess
motor energy.
Fault Display
The 320V Power Supply has a Fault Display that displays different faults
sensed by the power supply. Any of the faults will cause the power supply to
disable the DC bus. The Fault Display will continue to be illuminated with the
fault code until the power to the control cabinet has been turned-off. This is the
only way of resetting the power supply.
96-0038 Rev M
August 2010
5
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