Danfoss VLT AFE 302 - Shielded Cables; Fuses

4.3.6 Shielded Cables
NOTE
Danfoss recommends to use shielded cables between the
LCL filter and the AFE unit. Unshielded cables can be
between transformer and LCL filter input side.
It is important that shielded and armoured cables are
connected in a proper way to ensure the high EMC immunity
and low emissions.
The connection can be made using either cable glands or
clamps:
•
EMC cable glands: Generally available cable glands
can be used to ensure an optimum EMC
connection.
•
EMC cable clamp: Clamps allowing easy connection
are supplied with the frequency converter.
4.3.7
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 short-circuited and over-current
protected according to 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 below to protect service
personnel and equipment in case of an internal failure in the
frequency conveter. 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. The frequency
converter is equipped with an internal over-current
protection that can be used for upstream overload
protection (UL-applications excluded). See 4-18 Current Limit.
Moreover, fuses or circuit breakers can be used to provide
the over-current protection in the installation. Over-current
protection must always be carried out according to national
regulations.
525-690V, frame sizes D, E and F
The fuses below are suitable for use on a circuit capable of
delivering the Short Circuit Current Rating (SCCR) of 100,000
Amps (symmetrical).
Size/
Type
Bussmann
PN*
Rating Siba
Internal
Bussmann
Option
P630 170M7081 1600A,
700V
20 695 32.1600 170M7082
P710 170M7081 1600A,
700V
20 695 32.1600 170M7082
P800 170M7081 1600A,
700V
20 695 32.1600 170M7082
P900 170M7081 1600A,
700V
20 695 32.1600 170M7082
P1M0 170M7082 2000A,
700V
20 695 32.2000 170M7082
P1M2 170M7083 2500A,
700V
20 695 32.2500 170M7083
Table 4.4 Frame Size F, Line Fuses, 525-690V
Size/Type
Bussmann
PN*
Rating Siba
P630-
P1M2
170M8611 1100A,
1000V
20 781 32. 1000
Table 4.5 Frame Size F, Inverter Module DC Link Fuses, 525-690V
*170M fuses from Bussmann use the -/80 visual indicator, -
TN/80 Type T, -/110 or TN/110 Type T indicator fuses of the
same size and amperage may be substituted for the external
use.
Supplementary fuses
Frame size Bussmann PN* Rating
D, E and F KTK-4 4A, 600V
Table 4.6 SMPS Fuse
Size/Type Bussmann PN* LittelFuse Rating
P37K-P400,
525-690V
KTK-4 4A, 600V
P500-P1M2,
525-690V
KLK-15 15A, 600V
Table 4.7 Fan Fuses
Bussmann PN
Rating
FWC-20A-10F 20A, 600V
Table 4.8 Fan Voltage/Softcharge Fuse
How to Install
VLT
®
Active Front End AFE 302 Operating Instructions Liebherr
30 MG.33.X2.02 - VLT
®
is a registered Danfoss trademark
44