Rockwell Automation 8510 AC Spindle Drive System User Manual - Manual (Page 129)

Troubleshooting
Chapter 11
11-125
Table 11.F
Problems that Occur while the Drive is Operating
Possible Solutions Probable Cause Problem
Motor runs in a
random or uncon-
trolled manner or
with excessive
vibration when
either the Forward
or Reverse Run
command is
energized. Use the programming parameter ELECT CONFIG - Motor Phasing
to reverse the relative phasing of the motor to the resolver. Resolver phasing is incorrect.
Check all power wiring to the motor for continuity and tight
connections. Use an ohmmeter to verify phase to phase continuity
for each motor phase. When 1327AD series dual winding motors
are used, check both winding change contactors for proper
operation. Motor phase is open.
Refer to fault condition 6 for solutions. Resolver or resolver wiring is
malfunctioning.
Abs Overspeed
displayed - Motor
shaft speed
exceeding the
programmed value
of the Overspd Trip
parameter was
detected. Correctly program the MOTOR SELECT - Catalog Num and
ELECT CONFIG - Drive Cat Num parameters before applying 24V
DC to the Coast to Stop input. MOTOR SELECT - Catalog Num
and/or ELECT CONFIG - Drive
Cat Num programmed as “NONE
SELECTED” when the Coast to
Stop input is turned On.
Never allow the motor to become disconnected from the load or the
drive to be disconnected from an external control loop while the
drive is operating in torque mode. Motor disconnected from load
while drive in torque mode.
Reduce the overhauling load to a value that is less than the torque
limit setting of the drive. Excess overhauling load.
Check the resolver signals as defined under fault condition 6. Malfunctioning resolver or
resolver signals.
If problems were not found with other tests, replace Main Control
Board (Gate Drive Board and possibly CPU Board on A04/A06
drives). Malfunctioning printed circuit
board.
Bus Overvoltg
displayed - DC bus
voltage that
exceeded maxi-
mum allowable
limits was detected. Check Catalog Num setting to verify that it matches the motor
nameplate. Incorrect motor selected in
MOTOR SELECT - Catalog Num
parameter.
Adjust taps on transformer or add step-down transformer to keep
AC line voltage below 253V AC, 60 Hz or 242V AC, 50 Hz. Incoming 3 phase voltage is out of
tolerance.
Increase kVA rating of supply transformer to proper rating for drive
size. See Table 8.C. If overvoltage is detected during
regeneration, incoming AC line
impedance may be too high.
Replace Main Control Board (Gate Drive Board on A04/A06
drives). Malfunctioning regeneration
control circuit.
15
16
No.
17
Increase setting of Overspd Trip parameter or reduce setting of Max
Cmnd Spd parameter. The overspeed trip point should be set about
10% higher than the maximum command speed to avoid nuisance
trips.
Important: If the Overspd Trip parameter is inadvertently set to zero,
this fault may occur as soon as the power is applied to the drive.
With a setting of zero, even a one bit change from the resolver
decoding circuit will cause this fault.
Overspd Trip parameter set too low
relative to commanded speed.