Fuse Tables; Protection; Fuse Selection - Danfoss FC 102 Operating Instructions Manual

Specifications
Protection and Features
•
Electronic thermal motor protection against overload.
•
Temperature monitoring of the heat sink ensures that the frequency converter trips if the temperature reaches
95 °C ±5 °C. An overload temperature cannot be reset until the temperature of the heat sink is below 70 °C ±5 °C
(Guideline - these temperatures may vary for different power sizes, enclosures etc.). The frequency converter has
an auto derating function to avoid its heat sink reaching 95 °C.
•
The frequency converter is protected against short-circuits on motor terminals U, V, W.
•
If a mains phase is missing, the frequency converter trips or issues a warning (depending on the load).
•
Monitoring of the intermediate circuit voltage ensures that the frequency converter trips if the intermediate circuit
voltage is too low or too high.
•
The frequency converter is protected against ground faults on motor terminals U, V, W.

11.3 Fuse Tables

11.3.1 Protection

Branch circuit protection
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 converter. The frequency converter
provides full short-circuit protection in case of a short-
circuit on the motor output.
Overcurrent 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 overcurrent
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
Power
Size
Bussman Littelfuse PN Littelfuse
PN
N110 170M2619 LA50QS300-4 L50S-300
N132 170M2620 LA50QS350-4 L50S-350
N160 170M2621 LA50QS400-4 L50S-400
N200 170M4015 LA50QS500-4 L50S-500
N250 170M4016 LA50QS600-4 L50S-600
N315 170M4017 LA50QS800-4 L50S-800
Table 11.6 Fuse Options for 380-480 V Frequency Converters
MG16D302
Operating Instructions
Fuse options
Bussmann Siba PN
PN PN
FWH-300A 20 610
31.315
FWH-350A 20 610
31.350
FWH-400A 20 610
31.400
FWH-500A 20 610
31.550
FWH-600A 20 610
31.630
FWH-800A 20 610
31.800
Danfoss A/S © Rev. 06/2014 All rights reserved.
provide the overcurrent protection in the installation. Over-
current protection must always be carried out according to
national regulations.

11.3.2 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).
N110-N315 380–500 V
N75K–N400 525–690 V
Table 11.5 Recommended Fuses
Ferraz-Shawmut Ferraz-Shawmut PN
PN (Europe)
A50QS300-4 6,9URD31D08A0315
A50QS350-4 6,9URD31D08A0350
A50QS400-4 6,9URD31D08A0400
A50QS500-4 6,9URD31D08A0550
A50QS600-4 6,9URD31D08A0630
A50QS800-4 6,9URD32D08A0800
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type aR
type aR
Ferraz-Shawmut PN
(North America)
A070URD31KI0315
A070URD31KI0350
A070URD31KI0400
A070URD31KI0550
A070URD31KI0630
A070URD31KI0800
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