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• whether the axis is Enabled (servo loop is enabled).
• whether or not the Axis User Program is in process.
• whether or not a Jog is in process.
• whether or not a Move is in process.
• whether the direction is Forward or Reverse.
The numeric displays in the middle show:
• the Relative Position Feedback (Revs).
• the Relative Speed Feedback (RPM).
• the Program Speed (RPM).
Relative Position Feedback
The Relative Position Feedback displays the MicroLogix 1400 controller's High Speed Counter inputs that
count the Ultra1500 drive buffered encoder output steps. This is a relative position and does not represent
the actual encoder position or Ultra1500 drive position feedback. It is only a relative position that is
incremented or decremented as the buffered encoder output increases or decreases. The PLC program scales
the High Speed Counter input to a value in revolutions for usability.
Relative Speed Feedback
The Relative Speed Feedback displays a calculated speed value that is based on the delta Relative Position
Feedback over time. This is a derived relative speed and does not represent the actual Ultra1500 drive speed
feedback.
The Relative Position and Relative Speed Feedbacks are not used to close the Ultra1500 drive position or
IMPORTANT
velocity loops and should not be used to trim speed or fine-tune position. These relative approximations
should be used as status only and not to determine the actual representation of motor encoder position or
motor speed.
Program Speed
The Program Speed status display shows the PLC Axis User Program specified command speed that is sent
to the drive while the Simple Motion Control CCBB is in Program mode. If the Axis User Program is
executing a jog at 300RPM, then 300RPM will populate this status display. If the Axis User Program is
executing a 100-rev move, then this status display will show the command speed as the drive is told to
accelerate and decelerate through the move profile.
Although the MicroLogix 1400 controller sends Pulse Train Output pulses to the drive at a specified
frequency (Hz), the PLC program performs the appropriate scaling to allow you to enter and display the
corresponding speed in RPM.
Publication CC-QS008B-EN-P - December 2009
System Validation and Application Tips
Chapter 2
27
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