GE AF-300 P11 User Manual page 65

F14 Restart after momentary power failure (operation selection)
F 1 4 R E S T A R T
Setting range: 0 to 5
The following table lists the function details.
This function selects operation if a momentary power
failure occurs.
Set Value Function Name
0 Inactive (intermediate
drive trip)
1 Inactive (drive trip at
recovery)
2 Inactive (drive trip
after deceleration to a
stop at power failure)
3 Active (operation ride-
through; for high-inertia
loads)
4 Active (restart with the
frequency at the time
of power failure)
5 Active (restart with
start frequency; for low-
inertia loads)
Note: Function codes H13 to H16 are provided to control
a restart operation after momentary power failure. These
functions should be understood and used. The pick-up
(speed search) function can also be selected as a method
of restarting when power is recovered after a momentary
failure. (For setting details, see function code H09.) The
pick-up function searches for the speed of the coasting
motor to restart the motor without subjecting it to exces-
sive shock.
The function for detecting power failure and activating
protective operation (i.e., alarm output, alarm display, drive
output cutoff) for undervoltage can be selected. The
automatic restart function (for automatically restarting a
coasting motor without stopping) when the supply voltage
is recovered can also be selected.
Operation at Power Failure
If undervoltage is detected, the drive will
immediately trip and an undervoltage fault (LU) is
displayed. The drive output stops and the motor will
coast to a stop.
If undervoltage is detected, the drive output stops
and the motor will immediately coast to a stop. A
drive fault is not activated.
When the DC bus voltage reaches the operation
voltage level (H15), a controlled deceleration to a
stop occurs. The drive collects the inertial energy
of the load to maintain the DC bus voltage and
controls the motor until it stops, then an
undervoltage fault (LU) is activated. The drive will
automatically decrease the deceleration time if
necessary. If the amount of inertial energy from the
load is small, and the undervoltage level is
achieved before the motor stops, the undervoltage
fault is immediately activated and the motor will
coast to a stop.
When the DC bus voltage reaches the operation
voltage level (H15), energy is collected from the
inertia of the load to maintain the DC bus voltage
and extend the ride-through time. The drive will
automatically adjust the deceleration rate to
maintain DC bus voltage level. If undervoltage is
detected, the protective function is not activated,
but drive output stops and the motor coast to a
stop.
If undervoltage is detected, the protective function
is not activated. The drive output stops and the
motor will coast to a stop.
If undervoltage is detected, the protective function
is not activated, but drive output stops.
In a high-inertia system, the reduction in motor speed is
minimal even when the motor is coasting. A speed search
time is required when the pick-up function is active. In
such a case, the original frequency may be recovered
sooner when the function is inactive and the operation is
restarted with the frequency prior to the momentary power
failure.
The pick-up function works in the range of 5 to 120 Hz. If
the detected speed is outside this range, restart the motor
using the regular restart function.
5-12
Operation at Power Recovery
The drive operation is not automatically
restarted. Input a reset command and
operation command to restart.
An undervoltage fault (LU) is activated at
power recovery. Drive operation is not
automatically restarted. Input a reset
command to restart operation.
The drive operation is not automatically
restarted. Input a reset command and
operation command to restart operation.
Operation is automatically restarted. For
power recovery during ride-through, the
drive will accelerate directly to the
original frequency. If undervoltage is
detected, operation automatically
restarts with the frequency selected at
the time that the undervoltage was
detected.
Operation is automatically restarted with
the frequency selected at the time of
power failure.
Operation is automatically restarted with
the frequency set by F23, "Starting
frequency".