Fuji Electric FRENIC-AQUA series, User Manual

Page: 342 / 751

6.3 Details of Function Codes
6-61
Chap. 6
FUNCTION C
ODES
F14
Restart Mode after Momentary Power Failure (Mode selection)
H13 (Restart time)
H14 (Frequency fall rate)
H15 (Continuous running level)
H16 (Allowable momentary power failure time)
H92 and H93 (Continuity of Running, P and I)
F14 specifies the action to be taken by the inverter such as trip and restart in the event of a
momentary power failure.
„
Restart mode after momentary power failure (Mode selection) (F14)
Description
Data for F14
Auto search disabled Auto search enabled
0: Trip immediately As soon as the DC link bus voltage drops below the undervoltage level due
to a momentary power failure, the inverter issues undervoltage alarm LV
and shuts down its output so that the motor enters a coast-to-stop state.
1: Trip after recovery
from power failure
As soon as the DC link bus voltage drops below the undervoltage level due
to a momentary power failure, the inverter shuts down its output so that
the motor enters a coast-to-stop state, but it does not enter the
undervoltage state or issue undervoltage alarm LV .
The moment the power is restored, an undervoltage alarm LV is issued,
while the motor remains in a coast-to-stop state.
As soon as the DC link bus voltage drops below the continuous running
level due to a momentary power failure, continuous running control is
invoked. Continuous running control regenerates kinetic energy from the
load’s moment of inertia, continues running, and waits the recovery of
power. When an undervoltage condition is detected due to a lack of energy
to be regenerated, the output frequency at that time is saved, the output of
the inverter is shut down, and the motor enters a coast-to-stop state.
If a run command has been input,
restoring power restarts the inverter
at the output frequency saved when
undervoltage was detected.
If a run command has been input,
restoring power performs auto
search for idling motor speed and
restarts running the motor at the
frequency calculated based on the
searched speed.
3: Continue to run
(for heavy inertia or
general loads)
This setting is ideal for fan applications with a large moment of inertia.
As soon as the DC link bus voltage drops below the undervoltage level due
to a momentary power failure, the inverter shuts down the output so that
the motor enters a coast-to-stop state.
If a run command has been input,
restoring power restarts the inverter
at the output frequency saved when
undervoltage was detected.
If a run command has been input,
restoring power performs auto
search for idling motor speed and
restarts running the motor at the
frequency calculated based on the
searched speed.
4: Restart at the
frequency at which
the power failure
occurred
(for general loads)
This setting is ideal for applications with a moment of inertia large enough
not to slow down the motor quickly, such as fans, even after the motor
enters a coast-to-stop state upon occurrence of a momentary power failure.
As soon as the DC link bus voltage drops below the undervoltage level due
to a momentary power failure, the inverter shuts down the output so that
the motor enters a coast-to-stop state.
If a run command has been input,
restoring power restarts the inverter
at the starting frequency specified
by function code F23.
If a run command has been input,
restoring power performs auto
search for idling motor speed and
restarts running the motor at the
frequency calculated based on the
searched speed.
5: Restart at the
starting frequency
This setting is ideal for heavy load applications such as pumps, having a
small moment of inertia, in which the motor speed quickly goes down to
zero as soon as it enters a coast-to-stop state upon occurrence of a
momentary power failure.
Auto search is enabled by turning ON the digital terminal command STM ("Enable auto search for
idling motor speed at starting") or setting the H09 data to "1" or "2."
For details about the digital terminal command
STM and auto search, refer to the description of H09
(Starting Mode, Auto search).