GE AF-650 GP Programming Manual page 89

Parameter Descriptions
SP-10 Line failure
Options [1] Ctrl. ramp-down, [2] Ctrl. ramp-down, trip, [5] Kinetic
back-up, trip, [7] Kin. back-up, trip w recovery are not active when
the option [2] Torque is selected in parameter H-40 Configuration
Mode.
3 3
Option:
[5] Kinetic
back-up,
trip
88
Function:
If the mains does not return, U
DC
as long as possible by ramping the speed down
towards 0 RPM. Finally, the frequency converter
coasts.
If the mains returns while in kinetic back-up
mode, U increases above parameter SP-11 Line
DC
Voltage at Input Faultx1.35. This is detected in 1
of the following ways.
•
If U > parameter SP-11 Line Voltage at
DC
Input Faultx1.35x1.05.
•
If the speed is above the reference. This
is relevant if the mains comes back at a
lower level than before, for example,
parameter SP-11 Line Voltage at Input
Faultx1.35x1.02. This does not fulfil the
criterion in point 1, and the frequency
converter tries to reduce U
parameter SP-11 Line Voltage at Input
Faultx1.35 by increasing the speed. This
cannot be done as the mains cannot
be lowered.
•
If running mechanically. The same
mechanism as in point 2 applies, but
the inertia prevents the speed from
going above the reference speed. This
leads to the motor running mechan-
ically until the speed is above the
reference speed and the situation in
point 2 occurs. Instead of waiting for
that criterion, point 3 is introduced.
The difference between kinetic back-up with and
without trip is that the latter always ramps down
to 0 RPM and trips, regardless of whether mains
returns or not.
The function does not detect if mains returns.
This is the reason for the relatively high level on
the DC link during ramp down.
SP-10 Line failure
Options [1] Ctrl. ramp-down, [2] Ctrl. ramp-down, trip, [5] Kinetic
back-up, trip, [7] Kin. back-up, trip w recovery are not active when
the option [2] Torque is selected in parameter H-40 Configuration
Mode.
Option:
is maintained
[6] Alarm
[7] Kin. back-
to
DC
up, trip w
recovery
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Function:
A Normal operation
B Mains failure
C Kinetic back-up
D Trip
Illustration 3.38 Kinetic Back-up Trip
Kinetic back-up with recovery combines the
features of kinetic back-up and kinetic back-up
with trip. This feature makes it possible to select
between kinetic back-up and kinetic back-up
with trip, based on a recovery speed, config-
urable in parameter SP-15 Kin. Backup Trip
Recovery Level. If mains does not return, the
frequency converter ramps down to 0 RPM and
trips. If mains returns while in kinetic back-up at
a speed above the value in parameter SP-15 Kin.
Backup Trip Recovery Level, normal operation is
resumed. This is equal to [4] Kinetic Back-up. The
DC level during [7] Kinetic back-up is
parameter SP-11 Line Voltage at Input Faultx1.35.
A Normal operation.
B Mains failure.
C Kinetic back-up.
D Mains return.
E Normal operation: ramping.
Illustration 3.39 Kinetic Back-Up, Trip with
Recovery where Mains Returns above
Parameter SP-15 Kin. Backup Trip Recovery
Level
DET-618D