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
Arms (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 16A1200-240 V type gG
1K5 16A1200-240 V type gG
2K2 25A1200-240 V type gG
3K0 25A1200-240 V type gG
3K7 35A1200-240 V type gG
5K5 50A1200-240 V type gG
7K5 63A1200-240 V type gG
11K 63A1200-240 V type gG
15K 80A1200-240 V type gG
18K5 125A1200-240 V type gG
22K 125A1200-240 V type gG
30K 160A1200-240 V type gG
37K 200A1200-240 V type aR
45K 250A1200-240 V type aR
380-480 V
K37-1K5 10A1380-480 V type gG
2K2-4K0 20A1380-480 V type gG
5K5-7K5 32A1380-480 V type gG
11K 63A1380-480 V type gG
15K 63A1380-480 V type gG
18K 63A1380-480 V type gG
22K 63A1380-480 V type gG
30K 80A1380-480 V type gG
37K 100A1380-480 V type gG
45K 125A1380-480 V type gG
55K 160A1380-480 V type gG
75K 250A1380-480 V type aR
90K 250A1380-480 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