7 | Connection
STOBER
42
05/2019 | ID 442793.01
7.3.1.2
Line fuse in case of parallel connection
Every drive controller connected to the grid in the DC link group must be protected at the line input against overload and
short circuit. To do this, a fuse combination consisting of overload protection and solid state short circuit protection is
connected in series. A miniature circuit breaker protects against overload and a safety fuse with gR triggering characteristics
protects against short circuit.
Information
The installation of short-circuit fuses is not necessary under ideal prerequisites and ambient conditions. However, if the
application conditions pose the risk of contaminating the drive controllers, short-circuit fuses can protect against damage to
or failure of other devices within the DC link group.
Information
To ensure problem-free operation, always comply with the recommended trigger limits and trigger characteristics of the
fuse elements.
Information
Note that the charge current after switching on the power supply is less than the nominal input current of the power unit
I
1N,PU
.
Size
Type
I
1N,PU
(4 kHz)
[A]
I
1maxPU
(4 kHz)
[A]
Fuse selection
Miniature circuit breakers
Safety fuse
0
SC6A062
10
21 A
EATON
Type: FAZ-Z10/3,
Item No.: 278926
Triggering characteristics:
Z 10 A
SIBA
Type: URZ,
Item No. 50 140 06.25
Triggering characteristics:
gR 25 A
1
SC6A162
23.2
48.7 A
EATON
Type: FAZ-Z25/3,
Item No.: 278929
Triggering characteristics:
Z 25 A
SIBA
Type: URZ,
Item No. 50 140 06.50
Triggering characteristics:
gR 50 A
2
SC6A261
22.6
47.4 A
EATON
Type: FAZ-Z25/3,
Item No.: 278929
Triggering characteristics:
Z 25 A
SIBA
Type: URZ,
Item No. 50 140 06.50
Triggering characteristics:
gR 50 A
Tab. 40: Recommended line fuse in parallel connection
Maximum number of drive controllers
Two drive controllers of the same rating can be connected using a common fuse combination. The fuses and the resulting
maximum line input current correspond to that of a single drive controller.
In order to prevent gradual damage to the safety fuse, you can operate a maximum of two drive controllers on one fuse
combination.