GE Industrial Solutions AF-650 GP General Purpose Drive Programming Guide - Manual (Page 80)

SP-10 Line failure
Option: Function:
reduce U
DC
to SP-11 Line Voltage at Input
Fault*1.35 by increasing the speed. This
will not succeed as the mains cannot be
lowered.
3. If running motoric. The same mechanism
as in point two, but where the inertia
will prevent that the speed goes above
the reference speed. This will lead to the
motor running motoric until the speed is
above the reference speed and the
situation in point two occurs. Instead of
waiting for that criterion three is
introduced.
[5] Kinetic
back-up,
trip
The difference between kinetic back-up with and
without trip is that the latter will always ramp
down to 0 RPM and trip, regardless of whether
mains return or not.
The function is made so that it will not even
detect if mains return, this is the reason for the
relatively high level on the DC-link during ramp
down.
Illustration 3.36 Kinetic Back-up Trip
A Normal Operation
B Mains failure
C Kinetic back-up
D Trip
Table 3.18 Legend to Illustration 3.36
[6] Alarm
[7] Kin.
back-up,
trip w
recovery
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, configurable in
SP-15 Kin. Backup Trip Recovery Level to enable
detection of mains returning. If mains do not
return, the frequency converter ramps down to 0
RPM and trips. If mains return while in kinetic
back-up at a speed above the value in 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 SP-11 Line
Voltage at Input Fault* 1,35.
SP-10 Line failure
Option: Function:
Illustration 3.37 [7] Kinetic Back-Up, trip with
recovery where mains return above SP-15 Kin.
Backup Trip Recovery Level.
A Normal Operation
B Mains failure
C Kinetic back-up
D Mains return
E Normal operation: ramping
Table 3.19 Legend to Illustration 3.37
If mains return while in kinetic back-up at a speed
below SP-15 Kin. Backup Trip Recovery Level the
frequency converter ramps down to 0 RPM using
the ramp and then trips. If the ramp is slower
than the system will ramp down on its own, the
ramping will be done motoric and U DC will be at
the normal level (U
DC, m
*1.35).
Illustration 3.38 [7] Kinetic Back-Up, trip with
recovery, trip slow ramp where mains return
below SP-15 Kin. Backup Trip Recovery Level. In
this illustration a slow ramp is used.
A Normal Operation
B Mains failure
C Kinetic back-up
D Mains return
E Kinetic back-up, ramping to trip
F Trip
Table 3.20 Legend to Illustration 3.38
If the ramp is quicker than the system’s ramp
down on, the ramping will be done generatoric.
This results in a higher U
DC
which is limited using
the brake chopper/resistor brake.
Parameter Descriptions AF-650 GP Programming Guide
DET-618C 79
3 3