Drive Startup (System 12 SCR Drive)
2-67
2
iControl DC
Following Error Margin
The Following error is used for fault detection purposes only. The Following error parameter
(Configuration > Drive > Safety tab) sets the allowed margin of deviation from commanded
speed, as a percentage. A Tach Error fault is generated when the difference between intended
pattern speed and speed feedback exceeds the Following error margin. Calibrate speed feedback
to match the intended pattern.
1. On the Configuration > Pattern > Modes tab, verify that Standard Profile/High Speed
and Inspection Profile/High Speed parameters are set correctly for this job.
2. Verify that actual car speed on Inspection is equal to the Inspection High speed setting.
Please refer to “Calibrating Actual Car Speed (System 12 SCR Drive)” on page 2-62.
Verify Pattern Command and Drive Speed Feedback
1. From the View > Diagnostics menu, select Virtual Oscilloscope, and set Test point 1 =
Pattern (Command) and Test point 2 = Speed Feedback.
2. Run the car on Inspection and verify that the Speed Feedback trace is following the Pat-
tern (Command) trace. (If Standard Profile/High Speed, Inspection Profile/High Speed,
and actual car speed are correct, this will be the case. If not, verify and correct these set-
tings.)
Set the Following Error
• Set the Following error parameter (Configuration > Drive > Safety tab). It is recom-
mended to perform the Tach Error Tripping Threshold Adjustment procedure at this time.
Please refer to “Tach Error Tripping Threshold Adjustment” on page 2-68.
The default setting for the Following error parameter is 25%. For a car that has been prop-
erly adjusted as described above, after performing the Tach Error Tripping Threshold Adjustment, a
Following Error setting of 10% is fairly typical. You may choose to leave the Following error parame-
ter at the default setting or higher, but keep in mind that Following error is a percentage of speed. On
a 500fpm job a 25% Following Error allows a 125fpm contract speed deviation before a fault is gener-
ated.
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