TECHNICAL REFERENCE
465
June 1999
96-8000
12.14 FUSES
Brush Motors
The servo drive (DRIVER) cards have three fuses on each of the X, Y, Z, and A PCB's (F1, F2, F3). If these
fuses are ever blown, the associated motor will stop. This will only happen if there is a failure of the drive card
and the user should never attempt to replace these fuses.
The POWER PCB contains three ½-amp fuses located at the top right (FU1, FU2, FU3). If the machine is
subject to a severe overvoltage or a lightning strike, these fuses will blow and turn off all of the power. Replace
these fuses only with the same type and ratings. The two fuses FU4 and FU6 are not used.
On the servo drive assembly, there is a printed circuit board (SDIST) containing three one-amp fuses (FU1,
FU2, FU3). Two of these fuses protect the contactor and small transformers. They are never expected to blow.
The third fuse protects the regen load circuit load from shorts.
FUSE NAME TYPE RATING VOLTAGE LOCATION
(amps)
FU1 AGC ½ 250V POWER pcb, upper right
FU2 AGC ½ 250V "
FU3 AGC ½ 250V " "
(not used)Lamp AGC ½ 250V " lower left
FU1 AGC ½ 250V SDIST pcb, right center
FU2 AGC ½ 250V " "
FU3 AGC 5 250V " top center
F1 ABC 20 250V SDRIVER pcb's (X, Y, Z, A)
F2 ABC 20 250V "
F3 ABC 10 250V "
FU1 ABC 5 250V I/O PCB
FU2 ABC 5 250V I/O PCB
FU3 ABC 5 250V I/O PCB
FU4 ABC 5 250V I/O PCB
Brushless Motors
The brushless amplifier has one fuse, F1 15 amps. This fuse protects the amplifier itself from drastic damage.
If this fuse is ever blown, the associated motor will stop. This will only happen if there is a failure of the amplifier
card and the user should never attempt to replace these fuses.
The POWER PCB contains three ½-amp fuses located at the top right (FU1, FU2, FU3). If the machine is
subject to a severe overvoltage or a lightning strike, these fuses will blow and turn off all of the power. Replace
these fuses only with the same type and ratings. The two fuses FU4 and FU6 are not used.
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