ABB ACS880-01 Series, Firmware Instructions

Page: 44 / 664

44 ESP program features
5 Drive stops measuring the actual pump-motor speed if Start command
if OFF when parameter
09.41 Restart delay remaining timer is still
counting.
6 Parameter 74.30 Speed observer enable is set ON, so that when
restart delay time is elapsed, the speed measurement function starts
automatically.
2-3, 7-8,
13-14
The time needed for the Backspin speed observer function to detect
the actual motor speed is defined with parameter
74.39 Measurement
delay .
7-9 When Backspin speed observer is active, the drive start command will
have no effect until measured speed gets in to the safe-to-restart speed
region defined with parameters
74.31 Restart speed limit low and 74.32
Restart speed limit high .
9-11 The speed observer function will trigger the speed check timer set in
parameter
74.33 Observer speed check time when the measured
speed is within the safe-to-restart speed region.
10 If the measured speed is outside safe-to-restart speed region, then the
speed check timer will reset.
11-12
If the measured speed is within the safe-to-restart speed region defined
in parameter
74.33 Observer speed check time , then the speed
observer function routine is over. The drive stops modulating and
parameter
74.99 ESP start/stop sw , bit 8 is set to TRUE.
In case user drive start command is active, then immediately after
speed check time is elapsed the flying start sequence is initiated and
drive takes control over the pump-motor to go over the starting routines
and then accelerate it to the production speed.
12-13
The drive is waiting for the user to initiate the drive start command.
13-14
As soon as the user drive start command is given, the drive repeats
speed measurement routine to ensure that the actual speed is within
the safe-to-restart speed region, then the drive will proceed to the
normal starting routine without any speed check time delay.
If the speed is outside the safe-to-restart speed region, then all the
speed supervision procedure is repeated from point 8.
14-15
The drive gets in to normal production state through the starting
routines.
Control
scenario
Description