2 - Fagor Automation

6.2 Protection fuses
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To protect the FAGOR DDS servo drive 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 servo drive 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 of the 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 the power lines
feeding the auxiliary power supply. These fuses are already integrated
into all FAGOR power supplies.
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 in a DDS system with
power supply.
PS-25B4 PS-65A XPS-25 XPS-65
In 40 A > 100 A 40 A > 100 A
Isurge (1 s) > 115 A > 325 A > 115 A > 325 A
Clearing I²t (A²s) < 500 < 15000 < 500 < 15000
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 Technical data of the fuses to be installed in a DDS system with
compact drives.
ACD/SCD/CMC SCD
1.08 1.15 1.25 2.35
2.50
2.75
In > 5.6 A > 10.6 A > 17.7 A > 28 A > 41 A
Isurge (0.5 s) > 8 A > 15 A > 25 A > 35 A > 53 A
Clearing I²t (A²s) < 120 < 338 < 900 < 900 < 1350
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.
Power line connection
POWER LINE CONNECTION
Protection fuses 6.
DDS
HARDWARE
Ref.1307
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