SMAC
LAC-26 Technical Reference Manual
4/29/2013 82
Appendix 5 AMC Driver Troubleshooting
B.1 Fault Conditions and Symptoms
An inoperative drive is typically an indication of a disabling fault condition. The fault condition can either be
caused by a system parameter in excess of software or hardware limits, or by an event that has been user-
configured to disable the drive upon occurrence.
To determine whether the drive is in a fault state, use the Drive Status function in DriveWare to view active
and history event items and drive fault conditions. See the DriveWare Software Guide for more information
on reading the Drive Status window. Some common fault conditions caused by hardware issues are listed
below.
Over-Temperature Verify that the baseplate temperature is less than the maximum allowable baseplate
temperature value. The drive remains disabled until the temperature at the drive baseplate falls below this
threshold.
Over-Voltage Shutdown
1.
Check the DC power supply voltage for a value above the drive over-voltage shutdown limit. If the
DC bus voltage is above this limit, check the AC power line connected to the DC power supply for proper
value.
2.
Check the regenerative energy absorbed during deceleration. This is done by monitoring the DC
bus voltage with a voltmeter or oscilloscope. If the DC bus voltage increases above the drive over-voltage
shutdown limit during deceleration or regeneration, a shunt regulator may be necessary. See “Power Supply
Specifications” on page 17 for more information.
Under-Voltage Shutdown Verify power supply voltage for minimum conditions per specifications. Also note
that the drive will pull the power supply voltage down if the power supply cannot provide the required current
for the drive. This could occur when high current is demanded and the power supply is pulled below the
minimum operating voltage required by the drive.
Short Circuit Fault
1.
Check each motor lead for shorts with respect to motor housing, power ground, and also phase-to-
phase. If the motor is shorted it will not rotate freely when no power is applied while it is uncoupled from the
load.
2.
Disconnect the motor leads to see if the drive will enable without the motor connected.
3.
Measure motor armature resistance between motor leads with the drive disconnected.
Invalid Hall Sensor State See the “Commutation Sequence” table in “Hall Sensors” on page 9
for valid commutation states. If the drive is disabled check the following:
1.
Check the voltage levels for all the Hall sensor inputs.
2.
Make sure all Hall Sensor lines are connected properly.
B.1.1 Software Limits
Because DriveWare allows user configuration of many system parameters such as current, velocity, and
position limits, as well as an associated "event action" for DriveWare to take when the system reaches this
limit, it is possible for a drive to appear to be inoperative when in actuality it is simply in an assigned disable
state.
