Chapter 10
198
UM10350_PCNC770_Manual_0916A
Troubleshooting
Axes Drive Subsystem Checklist
Table 4.5 (...continued)
Axis Movement is Extremely Noisy or “Bumps”
Possible Cause Probability
Action to Identify Cause of Problem
Discussion
Squeaky Z-axis
brake (Z-axis
only)
Low Noise coming from the brake canister.
Removing the brake wires are
short and somewhat fragile –
lift the brake canister off the
motor with caution. Placing a
dab of grease on the motor
spindle shaft and on the
shafts mating surface on the
under side of the brake will
remove excess noise without
compromising the function of
the brakes.
Defective
capacitor for DC
bus board
Low
Power off control power, and unplug the
lower wire connectors on all the axis
drives (X, Y, Z and A).
—
With the electrical cabinet open, power
on control power.
Observe the green LED on
the DC bus board illuminate.
While observing the green LED on the
DC bus board, press the red E-stop.
If the LED extinguishes in two
seconds or less, the capacitor
is defective and must be
replaced. If the LED takes ve
seconds or more to extinguish,
the capacitor is good.
If the results are not conclusive, power
off control power and unplug the power
connectors from the axis drives, if not
already unplugged.
—
Power on control power and measure
DC voltage on wires 300 (common)
and 301 on DC bus board.
A DC voltage of a nominal
65 VDC (55-75) indicates the
capacitor is OK.
Power off control power and plug
the power connectors back on the
axis drives.
A DC voltage of a nominal
40 VDC (35-45) indicates the
capacitor is defective.
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