311
130BA215.10
RELA
Y 1
RELA
Y 2
9
9
6
03 02 01
90
05 04
I7, I8 Frame
IP54 380-480 V 45-55 kW
IP54 380-480 V 75-90 kW
91
L1
92
L2
93
L3
96
U
97
V
98
W
88
DC-
89
DC+
81
R-
8
R+
99
95
130BA248.10
1.3.6 Fuses
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-circuit 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.
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
, which will ensure
compliance with IEC 61800-5-1:
In case of malfunction, not following the fuse recommen-
dation may result in damage to the frequency converter.
Quick Guide
VLT HVAC Basic Drive Quick Guide
14
MG18A302 - VLT
®
is a registered Danfoss trademark
1
1
