Fuse Tables; Protection; Non Ul Compliance - Danfoss VLT FC 322 Instruction Manual

Specifications VLT® Automation VT Drive FC 322 D-Frame Instruction Manual

10.3 Fuse Tables

10.3.1 Protection

Branch Circuit Protection:
In order to protect the installation against electrical and
fire hazard, all branch circuits in an installation, switch
gear, machines etc., must be short-circuited and over-
current protected according to national/international
regulations.
Short-circuit Protection:
The must be protected against short-circuit to avoid
electrical or fire hazard. Danfoss recommends using the
fuses mentioned below to protect service personnel and
equipment in case of an internal failure in the frequency
conveter. The provides full short-circuit protection in case
of a short-circuit on the motor output.
Over-current Protection:
Provide overload protection to avoid fire hazard due to
overheating of the cables in the installation. The frequency
converter is equipped with an internal over-current
protection that can be used for upstream overload
protection (UL-applications excluded). See 4-18 Current
Limit. Moreover, fuses or circuit breakers can be used to
provide the over-current protection in the installation.
Over-current protection must always be carried out
according to national regulations.

10.3.2 Non UL Compliance

If UL/cUL is not to be complied with, we recommend using
the following fuses, which will ensure compliance with
EN50178. In case of malfunction, not following the
recommendation may result in unnecessary damage to the
frequency converter.
N110 - N250 380 - 500 V type gG
N315 380 - 500 V type gR
Table 10.2
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