3.2.3.4 Relays and Terminals on Enclosure Size H6
1
95
99
L1 91 / L2 92 / L3 93
U 96 / V 97 / W 98
03
02
01
06
05
04
2
3
4
e3
0b
b7
62
.1
1
1 Mains
3 Ground
2 Motor
4 Relays
Illustration 8: Enclosure Size H6, IP20, 380–480 V, 30 kW (40 hp)
3.2.4 Fuses and Circuit Breakers
3.2.4.1 Branch Circuit Protection
To prevent fire hazards, protect the branch circuits in an installation - switch gear, machines, and so on - against short circuits and
overcurrent. Follow national and local regulations.
3.2.4.2 Short-circuit Protection
Danfoss recommends using the fuses and circuit breakers listed in this chapter to protect service personnel or other equipment in case
of an internal failure in the unit or a short circuit on the DC link. The drive provides full short-circuit protection in case of a short circuit
on the motor.
3.2.4.3 Overcurrent Protection
Provide overload protection to avoid overheating of the cables in the installation. Overcurrent protection must always be carried out
according to local and national regulations. Design circuit breakers and fuses for protection in a circuit capable of supplying a
maximum of 100000 A
rms
(symmetrical), 480 V maximum.
Installation
Operating Guide | VLT® Compressor Drive CDS 803
AQ321748767627en-000101 / 130R0570
18 | Danfoss A/S © 2019.12
