462
TECHNICAL REFERENCE
June 1999
96-8000
POWER PCB (POWER)
The low voltage power distribution and high voltage fuses and circuit breakers are mounted on a circuit board
called the POWER PCB. The following connectors are on it:
P1 Brings incoming 230 VAC ( 460 VAC) 3-phase from main breaker.
P2 On/Off connections to front panel (740)
P3 Coil and aux connections to contactor K1
P4 Auto-off connection to IOPCB (170)
P5 Primary and secondary connections to transformer T5.
P6 230V AC from CB3 to coolant pump (930)
P7 115V AC from CB4 to IOPCB for solenoids (910)
P8 115V AC from IOPCB to CB4 for solenoids (90)
P9 +5/+12/-12 GND from low volt supply to logic boards (to MOCON) (860).
P10 +5/+12/Gnd from low volt supply to logic boards (860)
P11 +5/+12/Gnd from low volt supply to logic boards (860)
P12 +5/+12/Gnd from low volt supply to logic boards (860)
P13 +5/+12/Gnd from low volt supply to logic boards (860)
P14 12V AC to operator's lamp switch (800A) (not used)
P15 230V AC from main transformer to CB3 (70)
P16 Low voltage power from power supply (not used)
P17 +12V DC option connector (to MCD relay board) (860A)
P18 Not used
P19 Primary and Secondary connections to worklight transformer T4 (290) (not used)
P20 115V AC to low voltage power supply
P21 -12V DC option connector
P22 -12V DC option connector (to MOTIF)
P23 230 VAC from main transformer to CB5 (70A)
P24 230 VAC from CB3 to TSC coolant pump (930A)
P26 +5/+12/-12/ GND from low volt supply to logic boards (to processor) (860)
P27 +5/+12/-12/ GND from low volt supply to logic boards (860)
P28 +5/+12/-12 GND low volt power from power supply
P29 +5/-5 GND low volt power from power supply
P30 12V AC to operator's light (800) (not used)
P31 +12V option connector (to stack fan)(860A)
TB1 115VAC 3-phase from main transformer (94,95,96)
TB2 115 VAC 3-phase to IOPCB (91,92,93)
SECONDARY C IRCUIT B REAKERS
The following circuit breakers are located on the Power supply assembly.
CB2 controls the 3-phase 115volt distribution. It can be tripped only if there is a short in the control cables or
on the IOPCB.
CB3 controls the power to coolant pump only. It can be blown by an overload of the coolant pump motor or a
short in the wiring to the motor.
CB4 controls the 115V AC to the air solenoids, 4th axis brake, and the oiler. It is never expected to trip. If it
does trip, it is likely caused by a short circuit in the wiring on the I/O assembly or the wiring to the solenoids
on the spindle head.
CB5 Controls power to the TSC coolant pump only. It can be tripped by an overload of the TSC coolant pump
motor or a short in the wiring to the motor.
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