
X4 AC Drive User’s Manual
Chapter 5: Programming with the X4 Keypad
1428D-0607
- 38 -
© 2007 TB Wood’s All Rights Reserved
7.
Start the RS Measurement by pressing the FWD key. The measurement can only be made
with the FWD key. The FWD / REV terminals and the REV key will not work.
8.
The measurement will begin as the drive injects voltage to the motor at zero frequency. The
test lasts about two seconds.
9.
If the test was successful, the drive will stop and return to the configured control path. The
“Motor RS” parameter will contain a new value that is the calculated resistance of the motor.
10. If the test was not successful, the drive will fault with a “RS Meas. Fail” message (Fault 34).
If the test fails, you may want to try the test again with a different “Rated Mtr FLA” or
different Current Limit percentage.
5.6.2 Activating Automatic RS Measurement via Serial Link (Modbus)
1.
Make sure there is no load applied to the motor and that the motor shaft is free to spin without
damage or injury.
2.
Configure the following parameters to the data provided on the nameplate of the motor:
• Rated Volt (509)
• Rated Mtr FLA (510)
• Rated Mtr RPM (511)
• Power Factor (515)
3.
Change parameter “Find Mtr Data” (519) to a value of “Motor RS.” At this point, the RS
Measurement will be armed.
4.
Start the RS Measurement by writing a value of 0x0007 to parameter “SIO Cntl Word” (904).
5.
The measurement begins as the drive injects voltage to the motor at zero frequency. The test
lasts about two seconds.
6.
If the test was successful, the drive will stop and return to the configured control path. The
“Motor RS” parameter will contain a new value that is the calculated resistance of the motor.
7.
If the test was not successful, the drive will fault with a “RS Meas. Fail” message (Fault 34).
If the test fails, you may want to try the test again with a different “Rated Mtr FLA” or
different Current Limit percentage.
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