Alstom SHPM 101, Service Manual

Page: 88 / 336

SERVICE MANUAL R5888C
QUADRAMHO Chapter 2
Page 26 of 74
Test LED
option Test and method indications Comments
no.
42 Zone 3 comparators gated A–N A Amplitude
with low-set current B–N B hysteresis operates
level detectors C–N C on any Zone 3
comparator.
No tripping will
occur.
(Secondary inject A–B Z2
Zone 3 Fault) B–C Z3
C–A AIDED TRIP
Zero Sequence voltage level SOTF
detector (secondary inject)
Inhibit PSB opto input
(Apply rated volts to A5–A6)
V~ FAIL
43 Overvoltage level A–N A
detectors B–N B
(secondary inject voltage) C–N C
Pushbutton & pushbutton Z2
override
(operate push-button or
apply 0V to SK1 Pin9)
Low set current level A Z3
detectors B AIDED TRIP
(Secondary inject current) C SOTF
N V~ FAIL
45 Self check of Zone 1 A–N A The LED lights for
comparators B–N B the appropriate
C–N C comparator if it
A–B Z2 passed the last
B–C Z3 self check. If all
C–A AIDED TRIP 8 LEDs are
illuminated, self
check has not
occurred.
46 Self check of Zone 2 A–N A As option 45
comparators B–N B
C–N C
A–B Z2
B–C Z3
C–A AIDED TRIP