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Connecting the Toolroom Mill to Power
The Toolroom Mill can be powered from either 3 Phase 208 Wye
Power (Neutral Grounded) or Single Phase 240V. In either case,
a separate ground wire of the same size as the main conductors
must be provided in the power cable.
1. With the main circuit breaker in the OFF position (rotate the
shaft that connects to the breaker counterclockwise), hook up the
power lines to the terminals on top of the main circuit breaker.
Connect the separate ground line to the ground bus to the left of
the circuit breaker.
NOTE: For Single Phase operation, only terminals L1 and L3 of the
circuit breaker are used. L2, the center connection, should be
left open.
CAUTION! Make sure the main circuit breaker is in the OFF position
2. T5 is a small transformer mounted on the power supply assembly next to the main circuit
breaker. This transformer has two input connectors located about two-inches from the
transformer that allow it to be connected to either 240V or 200V. If the incoming power is
220-250 VRMS, use the 240V connection. If the incoming power is 187-219 VRMS, use the
200V connection. Failure to use the correct input connector will result in either overheating
of the main contactor or failure to reliably engage the main contactor.
3. The main power transformer is located at the bottom-right corner of the control cabinet.
This transformer supplies Single Phase 115V power to the cabinet. 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 signifi es a normal power-up sequence. Next, verify the DC bus
voltage on pins 6 & 7 with a voltmeter. 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.
5. Turn the main circuit breaker OFF by rotating its shaft counterclockwise. Close the door,
lock the latches, and turn the power back on.
E
O
LECTRICAL
PERATION
Fault Display
The 320V Power Supply has a Fault Display that displays different faults sensed by the
power supply. 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.
96-0041 Rev T
January 2009
BEFORE changing transformer connections.
Ground
Line
L1
L2 L3
Main
Circuit
Breaker
3
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