Fuses; Emc-Correct Electrical Installation - Danfoss VLT Series Quick Manual

Quick Guide
1 1
1
Illustration 1.5 IP20 380-480 V, 90 kW
1 Line
2 Relays
3 Earth
4 Motor
Table 1.12 Legend to Illustration 1.5

1.3.6 Fuses

Branch circuit protection
To protect the installation against electrical and fire hazard,
all branch circuits in an installation, switch gear, machines
etc., must be short-circuit and overcurrent protected
according to national/international regulations.
Short circuit protection
Danfoss recommends using the fuses mentioned in the
following tables to protect service personnel or other
equipment in case of an internal failure in the unit or
short-circuit on DC-link. The frequency converter provides
full short circuit protection in case of a short-circuit on the
motor.
Overcurrent protection
Provide overload protection to avoid overheating of the
cables in the installation. Overcurrent protection must
always be carried out according to national regulations.
Fuses must be designed for protection in a circuit capable
of supplying a maximum of 100,000 A
480 V maximum.
Non UL compliance
If UL/cUL is not to be complied with, use the fuses
mentioned in Table 1.13, which will ensure compliance
with IEC 61800-5-1:
8
VLT
4
2
3
(symmetrical),
rms
MG18F402 - VLT
®
HVAC Basic Drive Cascade Controller Quick Guide
In case of malfunction, not following the fuse recommen-
dation may result in damage to the frequency converter.
Bussmann Bussmann Bussmann Bussmann Max.
Power Type RK5 Type RK1 Type J
[kW]
3x380-480 V
0.37 FRS-R-10
0.75 FRS-R-10
1.5 FRS-R-10
2.2 FRS-R-15
3 FRS-R-15
4 FRS-R-15
5.5 FRS-R-25
7.5 FRS-R-25
11 FRS-R-50
15 FRS-R-50
18.5 FRS-R-80
22 FRS-R-80
30 FRS-R-80
37 FRS-R-100
45 FRS-R-125
55 FRS-R-150
75 FRS-R-200
90 FRS-R-250
Table 1.13 Recommended Fuses

1.3.7 EMC-Correct Electrical Installation

General points to be observed to ensure EMC-correct
electrical installation.
•
Use only screened/armoured motor cables and
screened/armoured control cables.
•
Connect the screen to earth at both ends.
•
Avoid installation with twisted screen ends
(pigtails), since this ruins the screening effect at
high frequencies. Use the cable clamps provided
instead.
•
It is important to ensure good electrical contact
from the installation plate through the installation
screws to the metal cabinet of the frequency
converter.
•
Use starwashers and galvanically conductive
installation plates.
•
Do not use unscreened/unarmoured motor
cables.
®
is a registered Danfoss trademark
UL
Type T
KTS-R10 JKS-10 JJS-10
KTS-R10 JKS-10 JJS-10
KTS-R10 JKS-10 JJS-10
KTS-R15 JKS-15 JJS-15
KTS-R15 JKS-15 JJS-15
KTS-R15 JKS-15 JJS-15
KTS-R25 JKS-25 JJS-25
KTS-R25 JKS-25 JJS-25
KTS-R50 JKS-50 JJS-50
KTS-R50 JKS-50 JJS-50
KTS-R80 JKS-80 JJS-80
KTS-R80 JKS-80 JJS-80
KTS-R80 JKS-R80 JJS-R80
KTS-R100 JKS-R100 JJS-R100
KTS-R125 JKS-R125 JJS-R125
KTS-R150 JKS-R150 JJS-R150
KTS-R200 JKS-R200 JJS-R200
KTS-R250 JKS-R250 JJS-R250
Non
UL
fuse
Type
gG
10
10
10
16
16
16
25
25
50
50
65
65
80
100
125
150
200
250