Delta RMC151 - Manual (Page 38)

RMC70/150 and RMCTools User Manual
• The 240MHz and 120 MHz values comes from the RMC's internal counter. If
you change the units from the above equation, make sure the units for the
equation work out properly. The units for MHz is [10 6 /sec].
3. If you wish to reverse the direction of the feedback, make the Scale negative.
4. Download the Scale to the RMC.
5. Calculate the Position Offset:
• Make sure the Position Offset is zero (0) and downloaded to the controller
before continuing.
• In the Axis Tools window, look at the Actual Position register.
• Move the axis to a point where you know what you want the position to be
(such as 0). Called this the Desired Position. Look at the Actual Position
register. Call this position P
0
.
• Calculate the Position Offset using the following equation: Position Offset =
Desired Position - P
0
.
6. Download the Offset to the RMC.
Example
1. Connected to an RMC70 is an MDT transducer with a calibration number of 9.1615
μs/in and no recirculations (this means it has just 1 recirculation). The system needs
to be scaled to inches.
• To calculate the Scale:
• Download the Scale to the RMC.
• To calculate the Offset: Move the axis to where it should be 0. The Actual
Position shows 2.4528. The Position Offset should be: 0 - 2.4528 = -2.4528.
• Download the Offset to the RMC.
2. Connected to an RMC70 is an MDT transducer with a calibration number of 9.012 μs/in
and 2 recirculations. The system needs to be scaled to inches.
• To calculate the Scale:
• Download the Scale to the RMC.
• To calculate the Offset: Move the axis to where it should be 10.125. The Actual
Position shows 11.241. The Position Offset should be: 10.125 - 11.241 = -
1.116.
• Download the Offset to the RMC.
3. Connected to an RMC150 is an MDT transducer with a calibration number of 9.1313
μs/in and no recirculations (this means it has just 1 recirculation). The system needs
to be scaled to millimeters.
• We must first calculate the scale, but in order to do that we need to know how
many position units there are in an inch: 25.4 mm/in.
• To calculate the Scale:
• Download the Scale to the RMC.
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