Fuses; Branch Circuit Protection; Short Circuit Protection; Overcurrent Protection - Danfoss VLT 2800 Quick Manual

VLT 2800 Quick Guide 1 Quick Guide
1

1.4.13 Fuses

Branch circuit protection:

In order to protect the installation against electrical and fire hazard, all branch circuits in an in-
stallation, switch gear, machines etc., must be short-circuited and overcurrent protected according
to national/international regulations.

Short circuit protection:

Danfoss recommends using the fuses mentioned in the following table to protect service personnel
or other equipment in case of an internal failure in the unit or short-circuit on DC-link. The fre-
quency converter provides full short circuit protection in case of a short-circuit on the motor or
brake output.

Overcurrent protection:

Provide overload protection to avoid overheating of the cables in the installation. Overcurrent
protection must always be carried out according to national regulations. Fuses must be designed
for protection in a circuit capable of supplying a maximum of 100,000 A (symmetrical), 480 V
rms
maximum.
Non UL compliance:
If UL/cUL is not to be complied with, Danfoss recommends using the fuses mentioned in the below
table, which will ensure compliance with EN50178/IEC61800-5-1:
In case of malfunction, not following the fuse recommendation may result in damage to the fre-
quency converter.
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