SERVICE MANUAL R5888B
QUADRAMHO Chapter 5
Addendum 2
Page 12 of 13
Echo feature (if used)
Check that no echo is given until the breaker has been open for at least 60ms by
measuring time from breaker open (with signal receive energised) to signal send.
Expected time 65 – 75ms
_________ms
Signal send echo time
Measured by dwell time of contacts _________ms
Expected time 100 – 110ms
Weak infeed feature (if used)
Week infeed echo
Breaker closed, SW8 to the right, SW7 to the left.
No ac volts. Delay on echo signal send from
signal receive energisation _________ms
Expected time 15 – 20ms
Signal send echo time _________ms
Expected time 105 – 115ms
No signal send if ac volts present
Weak infeed tripping (if used)
SW7 to the left. No ac volts.
Time from signal receive to any trip _________ms
Expected time 65 – 75ms
Aided trip indication
Three phase trips given
No trip with ac volts present
Delay in drop-off of carrier receive measured
by delay in drop-off of any trip after the
signal receive is removed _________ms
Expected time 105 – 115ms
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