InteliLite4 AMF20 Global Guide
110
Mains failure detection
The mains is considered as faulty when one or more of the following conditions are valid:
The mains voltage is out of the limits given by the setpoints Mains Undervoltage (page 274) and Mains
Overvoltage (page 272) for a time period longer than Mains Undervoltage Delay (page 276) or Mains
Overvoltage Delay (page 276).
The mains voltage unbalance is out of limit given by setpoint Mains Voltage Unbalance (page 276) for a
time period longer than Mains Voltage Unbalance Delay (page 277).
The mains frequency is out of the limits given by the setpoints Mains Underfrequency (page 279) and
Mains Overfrequency (page 277) for a time period longer than Mains < > Frequency Delay (page
281).
The MCB close command was not successful and the alarm Wrn MCB Fail (page 539) was not reset.
Phase rotation is incorrect.
Healthy mains detection
The mains is considered to be healthy when all of the following conditions are valid:
The mains voltage is within the limits given by the setpoints Mains Undervoltage (page 274) and Mains
Overvoltage (page 272).
The mains voltage unbalance is within the limits given by the setpoint Mains Voltage Unbalance (page
276).
The mains frequency is within the limits given by the setpoints Mains Underfrequency (page 279) and
Mains Overfrequency (page 277).
The alarm Wrn MCB Fail (page 539) is not active (if the MCB FEEDBACK (PAGE 453) matches the
expected position given by the MCB CLOSE/OPEN (PAGE 490)). This condition is not required if MCB is
open (MCB FEEDBACK (PAGE 453) is inactive).
Phase rotation is correct.
The AMF procedure
When the mains failure is detected, the following steps are performed:
If the setpoint MCB Opens On (page 283) is set to Mains Failure, the MCB is opened
The timer for automatic start of the Gen-set Emergency Start Delay (page 269) begins to count down.
After the timer has elapsed, the Gen-set is started.
Note: The automatic start of the Gen-set due to AMF function can be disabled by the binary inputs AMF
START BLOCK (PAGE 439) or MAINS FAIL BLOCK (PAGE 451).
If the setpoint MCB Opens On (page 283) is set to Gen Run, the MCB is opened once the generator
voltage is within limits (after Minimal Stabilization Time (page 237) elapses).
Note: If the mains are restored to health and the Gen-set is still not connected to the load, the controller
interrupts the startup process and closes back the MCB.
After Transfer Delay (page 270) elapses, the GCB is closed and the Gen-set begins to supply the load.
After the mains is restored to normal, the timer Mains Return Delay (page 269) begins to count down.
Maximum time between closing of MCB and opening GCB is given by the setpoint Transfer Delay (page
270). After GCB is opened, the Gen-set cools down and stops.
IMPORTANT: Controller has this behavior only in AUTO mode!
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