ABB DCS 400 - Auto Reclosing; Monitoring the Actual Speed Value

II K 4-29
Overview of Software
Monitoring the Mains Voltage:
e.g. Mains Supply Voltage = 400 V
Application = 4-Q
Armature Voltage Nominal = 420 V
… with maximum negative settings:
Net Underv Trip (1.10) = -10%
2-Q - application
U
net
(V)
F09-Fault
level
(V)
A02-Alarm
level
(V)
U
DC
(V)
U
DC max
(V)
230
186 196 270
285
380
317 333 460
471
400
324 341 470
496
415
338 355 490
514
440
359 377 520
545
460
373 391 540
570
480
393 413 570
595
500
414 435 600
619
4-Q - application
U
net
(V)
F09-Fault
level
(V)
A02-Alarm
level
(V)
U
DC
(V)
U
DC max
(V)
230
185 194 240
255
380
308 323 400
422
400
323 339 420
444
415
331 348 430
461
440
354 372 460
489
460
370 388 480
511
480
385 404 500
533
500
400 420 520
555
Fault and Alarm Level for specified motor voltage
(U
DC
) with
Net Underv Trip (1.10) = -10%
Auto Reclosing
In parameter Net Fail Time (1.11) the maximum
tolerated mains voltage failure time is set. In case of
mains undervoltage the drive is blocked and alarm
A02 is displayed during this time. If during this time the
mains voltage returns to a voltage level higher than
the trigger level the drive restarts automatically. After
this time elapsed and the mains voltage did not return
to a voltage level higher than the trigger level the drive
stops operation and fault F09 is displayed. Auto
Reclosing is not possible in this case.
Auto Reclosing is prevented if Net Fail Time = 0,0sec
is set. In this case the drive will always stop operation
with fault message F09 displayed if mains undervolt-
age occurs.
4.5.2 Monitoring the Actual Speed Value
The speed feedback via tacho-generator or encoder
is monitored. If the deviation between the speed
calculated from the EMF and the speed feedback is
too big the drive will be switched off with a fault
message Speed Meas Fault (F16).
Fault conditions:
EMF Act > 50% nominal EMF and
Tacho Speed Act < 12.5% Base Speed (1.05)
Set Net Underv Trip (1.10) = -10%
then 323V (Unet
min
) is the trip level
for F09.
For right operation Unet
act
has to
be greater than 323V.
Uarm (1.02)
= 420V
Unet
ac
t
(1.07) = 400V
Unet
min
= 323V
= F09
Trip
F09-Mains Undervoltage
acc. to formula
Unet
min
‘ = Uarm / (1,35 x cos α)
Unet
min‘ = 359V
A02-Mains Voltage Low
(5% (fix) above Unet
min)
A02
Level
= 339V
permitted
operating
range
for Unet
359V
U
DCmax
= (U
net
*1.35 * cos a) - 5% Alarm level
(Mains voltage deviation is not considered.)