Illustration 5.3: Cable entry holes for enclosure C1. The suggested use
of the holes are purely recommendations and other solutions are pos-
sible.
Illustration 5.4: Cable entry holes for enclosure C2. The suggested use
of the holes are purely recommendations and other solutions are pos-
sible.
5.1.3. 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 shortcircuit
and overcurrent protected according to the 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 in
tables 4.3 and 4.4 to protect service personnel or other equipment in case of an internal failure in the unit. 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. Over current protection must always be carried out
according to national regulations. The frequency converter is equipped with an internal over current protection that can be used for upstream overload
protection (UL-applications excluded). See par. 4-18. Fuses must be designed for protection in a circuit capable of supplying a maximum of 100,000
A
rms
(symmetrical), 500 V/600 V maximum.
Non UL compliance
If UL/cUL is not to be complied with, Danfoss recommends using the fuses mentioned in table 4.2, which will ensure compliance with EN50178:
In case of malfunction, not following the recommendation may result in unnecessary damage to the frequency converter.
Frequency converter
Max. fuse size
Voltage
Type
200-240 V
K25-1K1
16A
1
200-240 V
type gG
1K5
16A
1
200-240 V
type gG
2K2
25A
1
200-240 V
type gG
3K0
25A
1
200-240 V
type gG
3K7
35A
1
200-240 V
type gG
5K5
50A
1
200-240 V
type gG
7K5
63A
1
200-240 V
type gG
11K
63A
1
200-240 V
type gG
15K
80A
1
200-240 V
type gG
18K5
125A
1
200-240 V
type gG
22K
125A
1
200-240 V
type gG
30K
160A
1
200-240 V
type gG
37K
200A
1
200-240 V
type aR
45K
250A
1
200-240 V
type aR
380-480 V
K37-1K5
10A
1
380-480 V
type gG
2K2-4K0
20A
1
380-480 V
type gG
5K5-7K5
32A
1
380-480 V
type gG
11K
63A
1
380-480 V
type gG
15K
63A
1
380-480 V
type gG
18K
63A
1
380-480 V
type gG
22K
63A
1
380-480 V
type gG
30K
80A
1
380-480 V
type gG
37K
100A
1
380-480 V
type gG
45K
125A
1
380-480 V
type gG
55K
160A
1
380-480 V
type gG
75K
250A
1
380-480 V
type aR
90K
250A
1
380-480 V
type aR
Table 5.2: Non UL fuses 200 V to 480 V
1) Max. fuses - see national/international regulations for selecting an applicable fuse size.
5. Electrical installation
VLT
®
AQUA Drive
Operating Instructions
20
MG.20.M5.02 - VLT
®
is a registered Danfoss trademark
5
