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Thanks to check the differences as below:
· The VW3 A3 502 multi-pump card ensures compatibility of pump applications developed for an Altivar 38 drive with an Altivar 61, without reprogramming.
· The VW3 A3 503 multi-pump card is not compatible with pump applications developed for an Altivar 38 drive.
· The VW3 A3 502 multi-pump card ensures a complete pumping installation (up to 5 pumps) can be controlled.
· The VW3 A3 503 multi-pump card ensures a complete pumping installation (up to 4 pumps) can be controlled with a single drive, providing constant pressure.
For more info, thanks to check the Attached document.