InteliLite4 AMF20 Global Guide
109
BLOCK (PAGE 439) or MAINS FAIL BLOCK (PAGE 451).
Note: The AMF function works only in AUTO mode.
AMF sequence
State Condition of the transition Action Next state
Mains
operation
Mains failed or MCB
FEEDBACK (PAGE 453)
dropout, MCB Opens On
(page 283) = Mains Fail
MCB CLOSE/OPEN (PAGE 490)off,
Emergency Start Delay (page 269)
timer started
Mains failure
Mains failed or MCB
FEEDBACK (PAGE 453)
dropout, MCB Opens On
(page 283) = Gen Run
Emergency Start Delay (page 269)
timer started
Mains failure
Mains failure Mains voltage and frequency
OK, MCB Opens On (page
283) = Mains Fail
After elapsing MCB Close Delay (page
270) MCB CLOSE/OPEN (PAGE 490) on
Mains
operation
Mains voltage and frequency
OK, MCB Opens On (page
283) = Gen Run
None Mains
operation
Emergency Start Delay
(page 269) elapsed, MCB
Opens On (page 283) =
Mains Fail
Engine start sequence performed, then
GCB CLOSE/OPEN (PAGE 480) on
Island
operation
Emergency Start Delay
(page 269) elapsed, MCB
Opens On (page 283) =
Gen Run
Engine start sequence performed, then
MCB CLOSE/OPEN (PAGE 490) off, time
delay Transfer Delay (page 270)
performed and GCB CLOSE/OPEN (PAGE
480) on
Island
operation
Island
operation
Mains voltage and frequency
OK
Mains Return Delay (page 269) timer
started
Mains return
Mains return Mains failed Island
operation
Mains Return Delay (page
269) elapsed
GCB CLOSE/OPEN (PAGE 480) off, then
after Transfer Delay (page 270) MCB
CLOSE/OPEN (PAGE 490) on and then
engine stop sequence performed
Mains
operation
Note: Mains failed means mains over/under -voltage, over/under -frequency, voltage asymmetry is issued
(preset delay must elapse).
Note: If during start-up sequence mains returns, then MCB is reclosed with delay MCB Close Delay (page
270)(if opened, depending on MCB Opens On (page 283) setpoint) and start-up sequence is interrupted.
Note: If mains fails during stop procedure (cooling) again, stop sequence is interrupted, MCB opened and
GCB re-closed with Transfer Delay (page 270).