Danfoss FC 102 Operating Instructions

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
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 type aR
N75K–N400 525–690 V type aR
Table 11.5 Recommended Fuses
Power
Size
Fuse options
Bussman
PN
Littelfuse PN Littelfuse
PN
Bussmann
PN
Siba PN Ferraz-Shawmut
PN
Ferraz-Shawmut PN
(Europe)
Ferraz-Shawmut PN
(North America)
N110 170M2619 LA50QS300-4 L50S-300 FWH-300A 20 610
31.315
A50QS300-4 6,9URD31D08A0315 A070URD31KI0315
N132 170M2620 LA50QS350-4 L50S-350 FWH-350A 20 610
31.350
A50QS350-4 6,9URD31D08A0350 A070URD31KI0350
N160 170M2621 LA50QS400-4 L50S-400 FWH-400A 20 610
31.400
A50QS400-4 6,9URD31D08A0400 A070URD31KI0400
N200 170M4015 LA50QS500-4 L50S-500 FWH-500A 20 610
31.550
A50QS500-4 6,9URD31D08A0550 A070URD31KI0550
N250 170M4016 LA50QS600-4 L50S-600 FWH-600A 20 610
31.630
A50QS600-4 6,9URD31D08A0630 A070URD31KI0630
N315 170M4017 LA50QS800-4 L50S-800 FWH-800A 20 610
31.800
A50QS800-4 6,9URD32D08A0800 A070URD31KI0800
Table 11.6 Fuse Options for 380-480 V Frequency Converters
Specifications Operating Instructions
MG16D302 Danfoss A/S © Rev. 06/2014 All rights reserved. 83
11 11

Danfoss FC 102 Specifications

General

Brand	Danfoss
Model	FC 102
Category	DC Drives
Language	English