Question: How can exported «Engineer» oscilloscope data of variables of the Servo Drive 9400 be converted into physical units?
Answer:
The Servo Drive 9400 uses different signal types. The signal type of the variable used in the application can be identified via the ending of the variable name (_a; _n; _s; _p; _x). For motor control variables, the signal type appears in front of the name (Common; Current; Frequency; Phase; Position; Speed.; Torque; Voltage).
For better diagnostics, the variable values are converted into physical values (%; rpm; rev; rpm/s) in the «Engineer» oscilloscope display.
The conversion factors for each channel can be adapted. For this, click the corresponding unit to open the input dialog.
The following table shows the regulations for re-converting the raw data from an export.
This may e. g. be necessary for the further processing of exported data (e. g. in Excel) or for a user-specific scaling.
1. Application: User-specific scaling of oscilloscope channels:
Examples:
With one revolution of a mechanical system on the output end, a distance of 123 mm will be traversed (feed constant C02524 = 123 mm).
The variable FDB_dnActualSpeed_s has been recorded as actual speed. The speed shall not be indicated in [rpm] but in [mm/s].
The scaling limits for the 'Scaling' dialog are calculated as follows:
Upper limit = Lower limit = 480000 rpm x 123 mm/rev / 60 s = 984000
This scaling has been determined on the basis of the formula shown in line 6 of the attached pdf file.
The variable FDB_dnFollowingError-p has been recorded as following error. The following error shall not be indicated in [rev] but in [mm].
The scaling limits for the 'Scaling' dialog are calculated as follows:
Upper limit = Lower limit = 32768 rev x 123 mm/rev = 4030464
This scaling has been determined on the basis of the formula shown in line 11 of the attached pdf file.
2. Application: Further processing of exported oscilloscope data
When oscilloscope data is exported and stored in a *.txt file, the raw data can be identified without conversion. In general, this internal format is, however, not suitable for further processing and need to be converted. In the attachment you can find the regulations for converting the individual signal types into physical values.
