Fuse Tables; Protection; Fuse Selection - Danfoss VLT AutomationDrive FC 300 Operating Instructions Manual

Specifications

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 frequency converter 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 frequency converter
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
VLT Bussman
Model PN
N90K 170M2619 LA50QS300-4 L50S-300
N110 170M2620 LA50QS350-4 L50S-350
10 10
N132 170M2621 LA50QS400-4 L50S-400
N160 170M4015 LA50QS500-4 L50S-500
N200 170M4016 LA50QS600-4 L50S-600
N250 170M4017 LA50QS800-4 L50S-800
Table 10.6 Fuse Options for 380-500 V Frequency Converters
78
®
VLT Automation Drive D-Frame
Operating Instructions
Littelfuse PN Littelfuse Bussmann
PN PN
FWH-300A
FWH-350A
FWH-400A
FWH-500A
FWH-600A
FWH-800A
MG34U202 - VLT
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 Fuse Selection

Danfoss recommends 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.
The fuses below are suitable for use on a circuit capable of
delivering 100,000 Arms (symmetrical).
N90K-N250
N55K-N315
Table 10.5 Recommended Fuses
Siba PN Ferraz-Shawmut Ferraz-Shawmut PN
PN (Europe)
20 610 A50QS300-4 6,9URD31D08A0315
31.315
20 610 A50QS350-4 6,9URD31D08A0350
31.350
20 610 A50QS400-4 6,9URD31D08A0400
31.400
20 610 A50QS500-4 6,9URD31D08A0550
31.550
20 610 A50QS600-4 6,9URD31D08A0630
31.630
20 610 A50QS800-4 6,9URD32D08A0800
31.800
®
is a registered Danfoss trademark
380-500 V type aR
525-690 V type aR
Ferraz-Shawmut PN
(North America)
A070URD31KI0315
A070URD31KI0350
A070URD31KI0400
A070URD31KI0550
A070URD31KI0630
A070URD31KI0800