Servodrives / inverters series COSMOS 301X Installation, use and maintenance manual - EN
Protection for use exclusively in compliance with IEC 61800-5-1
If the servo-drive protection is ensured by fuses, their size must guarantee the protection of both the device
and the conductors. If you use 10x38mm class gG cartridge-type fuses, their minimum size for ensuring the
servo-drive full-power operation is 12 A. If you install higher rated current fuses, do not exceed 20 A: in case
of failure, the maximum short-circuit current that the drive can handle might be exceeded.
If bus voltage and/or voltage on the dynamic brake resistor is/are connected, a down-stream short-circuit
might damage the rectifier bridge; in order to provide protection, use fuses with a I
2
t value lower than 90 A
2
s.
Also the gG-type 10x38mm cartridge fuses with 12A rated current will protect the servo-drive.
If protection against short-circuits is provided by partial-range fuses (such as aR type), the overload
protection must be provided in other ways (for example with circuit breakers).
If the servo-drive must be used for building a machine, please refer to EN 60204-1 Standard for further
details about the sizing criteria.
CAUTION
The protective fuses must be sized in such a way as to ensure protection against short-
circuit and overload. Their cut-off rating must not be lower than the maximum specified
short-circuit current.
ATTENTION
Les fusibles utilisés pour la protection doivent être dimensionnés de manière à garantir la
protection en cas de court-circuit et de surcharge. Son pouvoir de coupure ne doit pas
être inférieur au courant de court-circuit maximal prévu.
Ver. 1.09 SMITECdd 35/74
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