Danfoss VLT AQUA Drive Design Manual page 106

5. How to Install
Furthermore, the terminal screw must be retightened after two days due to the softness of the aluminium. It is crucial to keep the connection a gas tight
joint, otherwise the aluminium surface will oxidize again.
5.2.8. 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 5.3 and 5.4 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
5
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 (symmetrical), 500 V/600 V maximum.
rms
Non UL compliance:
If UL/cUL is not to be complied with, Danfoss recommends using the fuses mentioned in table 5.2, 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:
200-240 V
K25-K75
1K1-2K2
3K0
3K7
5K5
7K5
11K
15K
18K5
22K
30K
37K
45K
380-480 V
K37-1K5
2K2-4K0
5K5-7K5
11K
15K
18K
22K
30K
37K
45K
55K
75K
90K
Table 5.3: Non UL fuses 200 V to 480 V
1) Max. fuses - see national/international regulations for selecting an applicable fuse size.
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Max. fuse size:
10A 1
20A 1
30A 1
30A 1
1
50A
1
63A
1
63A
80A 1
125A 1
125A 1
160A 1
200A 1
1
250A
10A 1
20A 1
30A 1
63A 1
63A 1
1
63A
1
63A
80A 1
100A 1
125A 1
160A 1
250A 1
250A 1
®
MG.20.N4.02 - VLT is a registered Danfoss trademark
®
VLT AQUA Drive Design Guide
Voltage: Type:
200-240 V type gG
200-240 V type gG
200-240 V type gG
200-240 V type gG
200-240 V type gG
200-240 V type gG
200-240 V type gG
200-240 V type gG
200-240 V type gG
200-240 V type gG
200-240 V type gG
200-240 V type aR
200-240 V type aR
380-480 V type gG
380-480 V type gG
380-480 V type gG
380-480 V type gG
380-480 V type gG
380-480 V type gG
380-480 V type gG
380-480 V type gG
380-480 V type gG
380-480 V type gG
380-480 V type gG
380-480 V type aR
380-480 V type aR