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Diagnostics and Troubleshooting
condition or an application that requires an external shunt (e.g., a large load with rapid
deceleration).
Low DC Bus
This fault will occur whenever the voltage on the DC bus drops below the Low DC Bus
threshold. The most likely cause of this fault is a reduction (or loss) of AC power. A 50 ms
debounce time is used with this fault to avoid faults caused by intermittent power disruption.
With and Epsilon drive, the low DC bus monitoring can be disabled with PowerTools
software in the Advanced tab.
Encoder State
Certain encoder states and state transitions are invalid and will cause the drive to report an
encoder state fault. This is usually the result of noisy encoder feedback caused by poor
shielding. For some types of custom motors it may be necessary to disable this fault. Refer to
the Advanced Tab section of Setting Up Parameters for more information.
Encoder Hardware
If any pair of complementary encoder lines are in the same state, an encoder line fault is
generated. The most likely cause is a missing or bad encoder connection.
Motor Overtemp
This fault is generated when the motor thermal switch is open due to motor over-temperature
or incorrect wiring.
RMS Shunt Power
EN Only
EN
This fault is generated when RMS shunt power dissipation is greater than the design rating
of the internal shunt.
High DC Bus Threshold Low DC Bus Threshold
EN 440 96
Epsilon 415 60
High DC Bus Threshold Low DC Bus Threshold
EN 440 96
Epsilon 415 60
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