|Question:||How is following error (position error) configured when using an NS-300 or NS-500?|
|Answer:||Pn505 (Overflow Level) in the SGDH ServoPack sets the maximum allowed position error (the following error limit). If the position error ever exceeds this value, the SGDH will fault with alarm A.D0. The units for Pn505 are 256 Reference Units [256 R.U.].|
To set Pn505, convert the maximum position error desired to R.U. and divide by 256, rounding to the nearest integer
Example: The reference unit (R.U.) has been set to 0.001mm and the user desires a max following error of 10mm.
10mm = 10,000 R.U.
Pn505 = 10,000 R.U./256 = 39 [256 R.U.] (rounded)
The R.U. represents the positioning resolution of the controller; the distance the machine moves when 1 pulse is received from the controller.
The R.U. is set based on the ratio of two parameters that define the number of controller pulses and encoder counts that represent the same distance.
The parameters used depend on the module attached.
SGDH: Pn202 and Pn203 (SGDH in position mode, receiving pulse train from external controller)
NS600: Pn202 and Pn203
NS300: Pn810 and Pn811
NS500: Pn810 and Pn811
Pn505 should be set after final tuning to 2 or 3 times the normally expected maximum position error.
|Product:||NS300 DeviceNet, NS500 Profibus |
|Category:||Applications; Hardware; Operation; Programming; Troubleshooting|
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