ABB
ABB DC Drives
12
3ADW000378R0101 |
DCS550 Technical catalog e a
How to select the motor voltage
Reference variables
The voltage characteristics are shown in the table beside. The
DC voltage characteristics have been calculated using the fol-
lowing assumptions:
–
U
VN
= rated input terminal voltage, 3-phase
–
Voltage tolerance ±10 %
–
Internal voltage drop approx. 1 %
–
If a deviation or a voltage drop has to be taken into con-
sideration in compliance with IEC and VDE standards, the
output voltage or the output current must be reduced in
accordance with the table on the right.
motor and regenerative operation
Example: maximum motor voltage U
dmax
for 500 V
AC
supply voltage U
VN
The power section of the converters is available as a single
(2-Q) bridge or double (4-Q) bridge. 4-Q drives are required
for regenerative breaking.
The bridge type 2-Q or 4-Q has an influence on the maximum
motor voltage. See table below.
System
connection
voltage
DC voltage
(recommended)
Ideal DC
voltage with-
out load
Recommended
DCS800
voltage class
U
VN
[V]
U
dmax 2-Q
[V]
U
dmax 4-Q
[V]
U
di0
[V]
230
265
240
310
05
380
440
395
510
05
400
465
415
540
05
415
480
430
560
05
440
510
455
590
05
460
530
480
620
05
480
555
500
640
05
500
580
520
670
05
525
610
545
700
05
If armature voltages higher than recommended are requested,
please check carefully whether your system is still working
under safe conditions.
The maximum output voltage of a 4-Q drive can be increased
up to the level of U
dmax 2-Q
. Thus the torque reversal from mo-
toring mode to generating mode increases up to 300 ms. This
lowers the dynamics of the drive and is only recommended for
non-dynamic applications (e.g. E-Stop function).