Emerson Control Techniques EN Series Installation Manual page 55

EN Drive Installation Manual
NVM Invalid
At power-up the drive tests the integrity of the non-volatile memory. This fault is generated
if the contents of the non-volatile memory are invalid.
Invalid Configuration
A function module was attached to the drive on its previous power-up. To clear, press and
hold the Reset button for 10 seconds.
Drive Overtemp
Indicates the drive IGBT temperature has reached 100°C (212°F).
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).
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. .
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High DC Bus Threshold
EN 440
High DC Bus Threshold
EN 440
Low DC Bus Threshold
96
Low DC Bus Threshold
96