Operation
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UDC2300 Controller Product Manual
67
6.11 Three Position Step Control Algorithm
Introduction
The Three Position Step Control algorithm allows the control of a valve (or other
actuator) with an electric motor driven by two controller output relays; one to move the
motor upscale, the other to move it downscale, without a feedback slidewire linked to the
motor shaft.
Estimated Motor Position
The Three Position Step control algorithm provides an output display (“OT”) which is an
estimated motor position since the motor is not using any feedback.
• Although this output indication is only accurate to a few percent, it is corrected each
time the controller drives the motor to one of its stops (0 % or 100 %).
• It avoids all the control problems associated with the feedback slidewire (wear, dirt,
and noise).
• When operating in this algorithm, the estimated “OT” display is shown to the nearest
percent (that is, no decimal).
Refer to Subsection 9.4 to set the Motor Travel Time (the time it takes the motor to travel
from 0 % to 100 %).
Motor Position Display
Table 6-14 Procedure for Displaying 3Pstep Motor Position
Step
Operation
Press
Result
1
Access the
Displays
DISPLAY
Until you see:
Upper Display = PV
Lower Display = OT (The estimated motor position in %)
Содержание UDC 2300
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Страница 30: ...Installation 20 UDC2300 Controller Product Manual 12 00 ...
Страница 62: ...Monitoring 52 UDC2300 Controller Product Manual 12 00 ...
Страница 80: ...Operation 70 UDC2300 Controller Product Manual 12 00 ...
Страница 92: ...Setpoint Rate Ramp Program Operation 82 UDC2300 Controller Product Manual 12 00 ...
Страница 124: ...Troubleshooting Service 114 UDC2300 Controller Product Manual 12 00 ...
Страница 170: ...Function Parameter Reference Guide 160 UDC2300 Controller Product Manual 12 00 ...
Страница 176: ...Index 166 UDC2300 Controller Product Manual 12 00 ...
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