Selecting The Fuses; Selecting The Ac Input Fuses; Selecting The Dc Fuses - ABB ACS880-04 drive modules Application Manual

32 Planning – additional instructions

Selecting the fuses

There must be fuses both at the AC supply side of the drive and at the DC connection.
They protect the cabling and limit the drive damage in case of a short circuit.

Selecting the AC input fuses


Equip every drive which you connect to the AC power line with fuses. The default AC fuses
for each drive are given in the drive hardware manual. Obey these guidelines if you select
other fuses:
•
Fuse type: Only use the default fuse types (aR, T, etc.). See the drive hardware
manual.
•
Voltage rating: According to the drive AC voltage rating, except use 500 V fuses for the
380 ... 500 V AC supply.
•
Nominal current of the fuses I
•
I is the average rectifying current of the drive.
rec,ave
•
Factor 1.6 covers the influence of cyclic load and ambient conditions.
•
If you do not know the average rectifier current of the drive, use the rated input
current of the drive instead. See the drive hardware manual.
•
Make sure that the operation time of the fuse is below the limit given for the default
fuses. See the drive hardware manual.

Selecting the DC fuses


Equip every drive with DC fuses. Install a fuse on both DC+ and DC- cable that you
connect from the common DC link connection point to the drive.
Suitable fuses for each drive type are listed in section
guidelines if you select the fuses on your own:
•
Fuse type: aR (ultra-rapid, fast)
•
Voltage rating: Select according to the nominal DC voltage (U
voltage limits of the drive
•
Nominal current: I
Make sure that the fuses also protect the DC cabling connected to the drive.
P
dc,ave(i)
I =
dc,ave
U
dc
1.6 Factor which covers the influence of the cyclic load and ambient conditions
I Average DC link current
dc,ave
I Nominal current of the fuse
F,N
P Maximum average DC link power in the DC connection terminals of the
dc,ave(i)
individual drive i. (during a worst case 3 min time window)
U actual DC link voltage = 1.35 x U
dc
≈ 1.6 × I
F,N
on page 45.
≈ 1.6 x I
F,N dc,ave(i)
ac
rec,ave
DC fuses on page 46. Obey these
). See section DC
DC