SERVICE MANUAL R5888B
QUADRAMHO Chapter 6
Addendum A
Page 6 of 15
Auxiliary relay – module normal scheme option operations only
Test Signal Equivalent Function Equivalent
socket pin (active low) LED auxiliary
SK2–25 SK A IND A Trip for fault on A phase
SK2–24 SK B IND B Trip for fault on B phase
SK2–23 SK C IND C Trip for fault on C phase
SK2–22 SK Z2 IND Z2 Trip for fault in Zone 2 Z2–1
SK2–21 SK Z3 IND Z3 Trip for fault in Zone 3 Z3–1
SK2–20 SK AT IND AIDED TRIP Aided trip 94Y–1
SK2–19 SK SOTF IND SOTF Switch on to fault trip 98–1
SK2–18 SK FF IND V~FAIL Fuse failure 97X–1
SK2–17 SK CTX Signal send output 85X–1 85X–2
SK2–16 SK +12V +12V supply rail
SK2–15 SK –12V –12V supply rail
SK2–14 SK +5V 5V supply rail
SK2–13 SK BAR Block autoreclose output 96–1
SK2–12 SK TRIP 3PH 3–phase trip signal issued. 94T–1 94T–2
SK2–11 SK ANY TRIP Trip signal issued by 94–1 94–2
distance relay.
SK2–10 SK PSB ANN
POWER SWING
Output of power swing 95–1
blocking feature.
SK2–9 SK CRX ANN ‘Signal receive’ optical
isolator energised.
SK2–8 SK MEM EN Memory feature enabled
SK2–7 SK TPS Output of power swing
50 ms timer.
SK2–6 SK ANY Any comparator operated
Z1Z2Z3 (except PSB).
SK2–5 SK SOTF EN Switch–on-to-fault
feature enabled.
SK2–4 SK MCK/28 Master clock/28 (=3.6kHz
@ 50Hz, 4.32kHz @ 60Hz)
SK2–3 SK 24V 24V supply rail
SK2–2 SK0V Zero volt common.
SK2–1 SK INH MR Short to SK2–2 to inhibit
relays
Figure 2: Table of test points
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