Epsilon Eb Digital Servo Drive Installation Manual
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).
This fault should not be allowed to occur repeatedly. System
changes should be made to eliminate Z fault events. Drive
power stage will become degraded if allowed to continue.
Note
If a cause for Z faults cannot be determined, write down all
observations prior to and after the Z faults and contact
Emerson Motion Control Technical Service.
High DC Bus
This fault will occur whenever the voltage on the DC bus
exceeds 415 VDC. 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 60 volts. 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.
High DC Bus Threshold Low DC Bus Treshold
E Series 440 96
Epsilon 415 60
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