ABB DCS 400, Manual

Page: 53 / 192

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
act
(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.)