Protection Fuses; Recommended Fuses - Fagor DDS Series Hardware Manual

6.2 Protection fuses

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To protect the FAGOR DDS system, fuses must be included on the lines
coming from mains. Figure F. H6/1 of this chapter shows its location.
INFORMATION. Note that FAGOR does not supply the fuses; in other
words, the FAGOR DDS system does not include the fuses as accessories.
The lines going to the auxiliary power supply, integrated in all FAGOR
power supplies, except the PS-65A that needs an external auxiliary power
supply called APS-24, and even those that go to the ACD/SCD/CMC
compact drives do not need external protection fuses because they are
already integrated in all of them. Therefore:
MANDATORY. DO NOT install external protection fuses in lines that feed
the auxiliary power supply or that of a compact drive.
Technical data
Extremely fast fuses must be installed in the mains lines to protect the
semiconductors sized according to the type of power supply.
Depending on the power supply being installed, they will be selected
according to the characteristics indicated in table F. H6/1 which are the ones
to be met by the fuses that must necessarily be installed in the line input of
the DDS system to protect it properly.
T. H6/1 Technical data of the fuses to be installed with the FAGOR DDS
system depending on the power supplied installed.
PS-25B4
 40 A
In
Isurge (1 s) > 115 A
Clearing I²t (A²s) < 500
INFORMATION. Actually, IGBT components cannot be protected with fuses.
Therefore, when using RPS power supplies, the protection does not prevent
the module from breaking down. Using them minimizes the number of
components that may be damaged as a result of a possible malfunction.
When using compact drives, the fuses must be selected according to the
following table:
T. H6/2 Fuses to be installed in a DDS system with compact drives. Technical
data
1.08
In > 5.6 A
Isurge (0.5 s) > 8 A
Clearing I²t (A²s) < 120

Recommended fuses

Table T. H6/3 and table T. H6/4 offer a variety of fuses from different
manufacturers and may be used as a reference. These references of the
fuses shown in these tables are valid for installations where the system is
connected directly to mains and for the rated power of the units. For lower-
than-rated power, we recommend to select the fuses according to the
characteristics of each system.
PS-65A XPS-25
 40 A
> 100 A
> 325 A > 115 A
< 15 000 < 500
ACD | SCD | CMC
1.15 1.25 2.35/2.50
> 10.6 A > 17.7 A > 28 A
> 15 A > 25 A > 35 A
< 338 < 900 < 900
   Power line connection
6.
XPS-65
> 100 A
> 325 A
< 15 000
SCD
2.75
> 41 A
> 53 A
< 1350
HARDWARE
Ref.1912
DDS
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