©2004 AUGIER SA.
IV-49
IV.3.1.2 “Open Circuit” fault:
Symptom Fault
Action
Lighting loop open
Measure the continuity of the loop
(on the transformer primaries and
secondaries)
Measure the output current value
Output current < 1.0A for more than
500 ms
Large load increase on the loop
caused by circuit switching
Fibre optic cables disconnected or
faulty
Check the state of the fibre optic
cables between the regulation board
and the thyristor control boards
Measuring board to motherboard link
faulty
Check state of the ribbon cable
between measuring board and
motherboard
Thyristor trigger-gates faulty
Measure the state of the thyristors
Protection detection level setting on
motherboard
Check setting of the level in the
menu “Alarms and warnings” then
“Open circuit”
Thyristors faulty in open circuit
Measure the state of the thyristors
The CCR has stopped
The message:
“ALARM: I << Open Cir.”
is displayed