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Epsilon Eb Digital Servo Drive Installation Manual
Invalid Configuration
Epsilon Only
This fault will occur if the digital board in the drive does not match the power board
settings. It is only useful during manufacturing. A drive with this fault should be returned
for service.
Drive Overtemp
Indicates the drive IGBT temperature has reached 100° C.
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).
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 Control Techniques Technical Support.
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. With and Epsilon drive,
the low DC bus monitoring can be disabled with PowerTools software in the Advanced tab.
High DC Bus Threshold Low DC Bus Treshold
E Series 440 96
Epsilon 415 60