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Epsilon Eb and EN Drives Reference Manual
Overspeed
This fault occurs in one of two circumstances:
1. When the actual motor speed exceeds the Overspeed Velocity Limit parameter or 150%
of motor maximum operating speed. This parameter can be accessed with PowerTools
software.
2. If the combination of command pulse frequency and Pulse Ratio can generate a motor
command speed in excess of the fixed limit of 13000 RPM, an Overspeed Fault will be
activated. In Pulse mode operation and any Summation mode which uses Pulse mode,
the input pulse command frequency is monitored and this calculation is made. For
example, with a Pulse Ratio of 10 pulses per motor revolution, the first pulse received
will cause an Overspeed fault even before there is any motor motion.
Following Error
This fault is generated when the following error exceeds the following error limit (default
following error limit is .2 revs). With PowerTools you can change the Following Error Limit
value or disable in the Position tab. The Following Error Limit is functional in Pulse mode
only.
Travel Limit +/-
This fault is caused when either the + or - Travel Limit input function is active.
All "On"
This is a normal condition during power up of the drive. It will last for less than 1 second. If
this display persists, call Control Techniques for service advice.
Normally, "All On" for less than one second during power-up. All segments dimly lit when
power is "Off" is normal when an external signal is applied to the encoder inputs (motor or
master) or serial port from an externally powered device. The signals applied to the inputs
cannot exceed 5.5V level required to drive logic common or drive damage will occur.
Diagnostic Analog Output Test Points
The drive has two 8-bit real-time Analog Outputs which may be used for diagnostics,
monitoring or control purposes. These outputs are referred to as Channel 1 and Channel 2.
They can be accessed from the Command Connector on the drive or from the Diagnostics
Analog Output Pins located on the front of the drive.
Each Channel provides a programmable Analog Output Source.
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