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
Current Limit
in the
VLT HVAC Drive Programming Guide
. 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 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.
Non-UL compliance
Adjustable frequency
drive
Max. fuse size
Voltage
Type
200–240 V
1K1-1K5
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
1K1
10A
1
380–500 V
type gG
2K2-3K0
16A
1
380–500 V
type gG
4K0-5K5
25A
1
380–500 V
type gG
7K5
35A
1
380–500 V
type gG
11K–15K
63A
1
380–500 V
type gG
18K
63A
1
380–500 V
type gG
22K
63A
1
380–500 V
type gG
30K
80A
1
380–500 V
type gG
37K
100A
1
380–500 V
type gG
45K
125A
1
380–500 V
type gG
55K
160A
1
380–500 V
type gG
75K
250A
1
380–500 V
type aR
90K
250A
1
380–500 V
type aR
1) Max. fuses - see national/international regulations to select an appropriate fuse size.
Table 4.2:
Non-UL fuses 200 V to 480 V
Circuit Breakers manufactured by General Electric, Cat. No. SKHA36AT0800, 600 V AC maximum, with the rating plugs listed below can be used to meet
UL requirements.
Size/Type
Rating plug catalog #
Amps
P110
SRPK800A300
300
P132
SRPK800A350
350
P160
SRPK800A400
400
P200
SRPK800A500
500
P250
SRPK800A600
600
Table 4.3:
Circuit Breaker Tables - D enclosures, 380–480 V
Size/Type
Bussmann PN*
Rating
Ferraz
Siba
P250
170M4017
700 A, 700 V
6.9URD31D08A0700
20 610 32.700
P315
170M6013
900 A, 700 V
6.9URD33D08A0900
20 630 32.900
P355
170M6013
900 A, 700 V
6.9URD33D08A0900
20 630 32.900
P400
170M6013
900 A, 700 V
6.9URD33D08A0900
20 630 32.900
Table 4.4:
E enclosures, 380–480 V
4 Electrical installation
VLT
®
HVAC Drive Instruction Manual
4-2
MG.11.A9.22 - VLT
®
is a registered Danfoss trademark
4