2
96-0041 Rev V
March 2012
Machine input power must be grounded. The machine will not function properly
on ungrounded power.
The maximum voltage leg-to-leg or leg-to-ground should not exceed 260 volts.
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 counter-
clockwise), 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
BEFORE changing transformer connections.
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 con-
trol 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 signiies
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.
Main
Circuit
Breaker
Ground
Line
L1
L2 L3
