Cause : Telegram failure at GSST1 comes when the receipt of the first valid protocol, no further telegrams have been received within the time period set in parameter P787.
Possible fault causes
• Cable break
• Error in USS master
Cause : Telegram failure at GSST2 when P790 = 2:
USS telegram failure at G-SST2
(active from the first receipt of a valid protocol in all operating states)
After the receipt of the first valid protocol, no further telegrams have been received within the time period set in parameter P797.
Possible fault causes
♦ Cable break
♦ Error in USS master
when P790 = 4 or 5: Peer-to-peer telegram failure at G-SST2
(active in operating states of ≤ o6)
After the receipt of the first valid protocol, no further telegrams have been received within the time period set in parameter P797.
Possible fault causes
♦ Interruption in connecting cable
♦ EMC interference on connecting cable
♦ P797 is set too low
