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VLT
®
HVAC Drive Instruction Manual
Overcurrent protection
Provide overload protection to avoid fire hazard due to overheating of the cables in the installation. Overcurrent protection must always
be provided in accordance with national regulations. The adjustable frequency drive is equipped with internal overcurrent protection
that can be used for upstream overload protection (UL applications excluded). See par. 4-18
Programming Guide
500 V/600 V maximum.
If UL/cUL is not to be complied with, Danfoss recommends using the fuses mentioned in the table below, which will ensure compliance with EN50178.
In case of malfunction, not following the recommendation may result in unnecessary damage to the adjustable frequency drive.
UL compliance
Non-UL compliance fuses
Adjustable frequency
drive
200–240 V - T2
1K1-1K5
2K2
3K0
3K7
5K5
7K5
11K
15K
18K5
22K
30K
37K
45K
380–480 V - T4
1K1-1K5
2K2-3K0
4K0-5K5
7K5
11K–15K
18K
22K
30K
37K
45K
55K
75K
90K
1) Max. fuses - see national/international regulations to select an appropriate fuse size.
Table 4.3: Non-UL fuses 200 V to 480 V
. Fuses must be designed for protection in a circuit capable of supplying a maximum of 100,000 A
Max. fuse size
16A
1
25A
1
25A
1
35A
1
50A
1
1
63A
1
63A
1
80A
125A
1
125A
1
160A
1
200A
1
250A
1
10A
1
1
16A
1
25A
1
35A
63A
1
63A
1
63A
1
80A
1
1
100A
1
125A
1
160A
250A
1
250A
1
MG.11.AB.22 - VLT
®
is a registered Danfoss trademark
4 Electrical Installation
Current Limit
in the VLT HVAC Drive
rms
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
380–500 V
type gG
380–500 V
type gG
380–500 V
type gG
380–500 V
type gG
380–500 V
type gG
380–500 V
type gG
380–500 V
type gG
380–500 V
type gG
380–500 V
type gG
380–500 V
type gG
380–500 V
type gG
380–500 V
type aR
380–500 V
type aR
(symmetrical),
4
4-5
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