Emerson Control Techniques Epsilon Eb Series Reference Manual page 39

Epsilon Eb and EN Drives Reference Manual
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. 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.
In Motion Velocity
The In Motion Velocity parameter defaults to a value of 10 RPM. If the motor Velocity
Feedback is above the In Motion Velocity value, the In + Motion or In - Motion output
function is active. When the motor velocity falls below one half of the In Motion Velocity,
the In + Motion or In - Motion output function is inactive.
The maximum value for In Motion Velocity is 100 RPM and is intended to be used to indicate
"in motion" not "at speed".
Note
The In Motion Velocity detect is monitored every 400 µs so machine jitter and torque
ripple could cause flicker in this signal if the commanded velocity is near the In Motion
Velocity parameter value.
Motor Direction Polarity
The direction that the motor turns with a positive command can be changed with the Positive
Direction parameter. This can be accessed with PowerTools FM in the EZ Setup tab or
Detailed Setup tab. The positive direction by default causes the motor to turn CW as viewed
looking at the shaft.
Note
CW and CCW rotation is determined by viewing the motor from the shaft end.
Figure 11: Clockwise Motor Rotation
Positive direction is defined as the command which causes the internal position counter to
count "Up". They are:
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