Vacon 50X User Manual - page 48
47
vacon
keypad operation and programming
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5
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 re-
sistance 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.
11.
If the measurement process fails for any reason, it is possible to physically measure
motor resistance by using an ohmmeter and dividing the result by 2. Then enter this
value manually into parameter 514 (Motor RS).
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 Mtr 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 re-
sistance 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.
8.
If the measurement process fails for any reason, it is possible to physically measure
motor resistance by using an ohmmeter and dividing the result by 2. Then enter this
value manually into parameter 514 (Motor RS).