Emerson Epsilon Eb Series Reference Manual page 132

Power Module
This fault is generated when a power stage over-temperature, over-current or loss of power
stage logic supply occurs. This can be the result of a motor short to ground, a short in the
motor windings, a motor cable short or the failure of a switching transistor.
It can also occur if the drive enable input is cycled "Off" and "On" rapidly (>10 Hz).
High DC Bus
This fault will occur whenever the voltage on the DC bus exceeds the High DC Bus threshold.
The most likely cause of this fault would be an open external shunt fuse, a high AC line
condition or an application that requires an external shunt (e.g., a large load with rapid
deceleration).
E Series
Epsilon
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.
E Series
Epsilon
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 complentary encoder lines are in the same state, an encoder line fault is
generated. The most likely cause is a missing or bad encoder connection.
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High DC Bus Threshold Low DC Bus Threshold
440 96
415 60
High DC Bus Threshold Low DC Bus Threshold
440 96
415 60
Diagnostics and Troubleshooting
115