Danfoss VLT Micro Drive FC 51 Design Guide

6.6 Fuses
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 overcurrent protected
according to national/international regulations.
Short circuit protection
Danfoss recommends using the fuses mentioned in the
following tables to protect service personnel or other
equipment in case of an internal failure in the unit or
short-circuit on DC-link. The frequency 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
rms
(symmetrical),
480 V maximum.
Non UL compliance
If UL/cUL is not to be complied with, Danfoss recommends
using the fuses mentioned in Table 6.3
, which ensures
compliance
with EN50178/IEC61800-5-1:
In case of malfunction, not following the fuse recommen-
dation may result in damage to the frequency converter
and the installation.
FC 51
Max. Fuses UL
Max. fuses non
UL
Bussmann Bussmann Bussmann Littel fuse
Ferraz-
Shawmut
Ferraz-
Shawmut
1X200-240 V
kW Type RK1 Type J Type T Type RK1 Type CC Type RK1 Type gG
0K18-0K37 KTN-R15 JKS-15 JJN-15 KLN-R15 ATM-R15 A2K-15R 16A
0K75 KTN-R25 JKS-25 JJN-25 KLN-R25 ATM-R25 A2K-25R 25A
1K5 KTN-R35 JKS-35 JJN-35 KLN-R35 - A2K-35R 35A
2K2 KTN-R50 JKS-50 JJN-50 KLN-R50 - A2K-50R 50A
3x200-240 V
0K25 KTN-R10 JKS-10 JJN-10 KLN-R10 ATM-R10 A2K-10R 10A
0K37 KTN-R15 JKS-15 JJN-15 KLN-R15 ATM-R15 A2K-15R 16A
0K75 KTN-R20 JKS-20 JJN-20 KLN-R20 ATM-R20 A2K-20R 20A
1K5 KTN-R25 JKS-25 JJN-25 KLN-R25 ATM-R25 A2K-25R 25A
2K2 KTN-R40 JKS-40 JJN-40 KLN-R40 ATM-R40 A2K-40R 40A
3K7 KTN-R40 JKS-40 JJN-40 KLN-R40 - A2K-40R 40A
3x380-480 V
0K37-0K75 KTS-R10 JKS-10 JJS-10 KLS-R10 ATM-R10 A6K-10R 10A
1K5 KTS-R15 JKS-15 JJS-15 KLS-R15 ATM-R15 A2K-15R 16A
2K2 KTS-R20 JKS-20 JJS-20 KLS-R20 ATM-R20 A6K-20R 20A
3K0 KTS-R40 JKS-40 JJS-40 KLS-R40 ATM-R40 A6K405R 40A
4K0 KTS-R40 JKS-40 JJS-40 KLS-R40 ATM-R40 A6K-40R 40A
5K5 KTS-R40 JKS-40 JJS-40 KLS-R40 - A6K-40R 40A
7K5 KTS-R40 JKS-40 JJS-40 KLS-R40 - A6K-40R 40A
11K0 KTS-R60 JKS-60 JJS-60 KLS-R60 - A6K-60R 63A
15K0 KTS-R60 JKS-60 JJS-60 KLS-R60 - A6K-60R 63A
18K5 KTS-R60 JKS-60 JJS-60 KLS-R60 - A6K-60R 80A
22K0 KTS-R60 JKS-60 JJS-60 KLS-R60 - A6K-60R 80A
Table 6.3 Fuses
How to Install
VLT
®
Micro Drive FC 51 Design Guide
50 MG02K202 - VLT
®
is a registered Danfoss trademark
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Danfoss VLT Micro Drive FC 51 Specifications

General

Enclosure	IP20
Output Voltage	0-100% of supply voltage
Altitude	Up to 1000 m without derating
Power Range	0.18-22 kW
Control Method	V/f
Communication	Modbus RTU
Protection Features	Over-voltage, under-voltage, over-current, over-temperature
Ambient Temperature	-10°C to 50°C
Storage Temperature	-25°C to 65°C
Relative Humidity	5-95% (non-condensing)
Input Voltage	200-240 V, 380-480 V
Braking Function	Integrated braking chopper (optional)