ACS550-02/U2 User’s Manual 295
Technical data
Fuses and circuit breakers
Fuses
Branch circuit protection must be provided by the end-user, sized per national and
local electric codes. Recommendations for fuses for short-circuit protection on the
input cable and the drive are below.
Verify that the fuse operates rapidly enough by checking that the short-circuit
current of the installation is at least the minimum short-circuit current given in
the table below. The short-circuit current of the installation can be calculated as
follows:
where
I
k2-ph
= short-circuit current in symmetrical two-phase short-circuit (A)
U = network line-to-line voltage (V)
R
c
= cable resistance (ohm)
Z
k
= z
k
· U
N
2
/S
N
= transformer impedance (ohm)
z
k
= transformer impedance (%)
U
N
= transformer rated voltage (V)
S
N
= nominal apparent power of the transformer (kVA)
X
c
= cable reactance (ohm).
If the calculated short-circuit current of the installation is smaller than the minimum
short-circuit current given in the table below, the fuse does not operate rapidly
enough to protect the drive in 0.1 s. Select a faster fuse to ensure that the required
0.1 s operation time is met.
Type code
ACS550-02
ACS550-U2
Input
current
Fuses
Min. short-circuit
current
IEC 60269
gG
ABB Control
type
UL Class T
Bussmann
type
AA A
A
-196A-4 196 3820 250 OFAF1H250 250 JJS-250
-245A-4 245 4510 250 OFAF2H315
400 JJS-300
-289A-4 289 4510 315 OFAF2H315
400 JJS-400
-316A-A 316 400
400 JJS-500
-368A-4 368 6180 400 OFAF3H400
400 JJS-500
-414A-A 414 500
600 JJS-500
-486A-4 486 10200 500 OFAF3H630
600 JJS-600
-526A-4 526 10200 630 OFAF3H630
800 JJS-800
-602A-4 602 10200 630 OFAF3H630
800 JJS-800
-645A-4 645 13500 800 OFAF3H800
800 JJS-800
00467918.xls B
I
k2-ph
=
2 ·
R
c
2
+ (Z
k
+ X
c
)
2
U
To Next Page
Loading...
Need help?
General
