Manual

Table Of Contents

3.2.3.14 Enclosure size I7, I8

DC-

e30bc248.10

Illustration 21: Enclosure Sizes I7, I8, IP54, 380–480 V, 45–55 kW (60–70 hp), IP54, 380–480 V, 75–90 kW (100–125 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.

3.2.4.4 UL/Non-UL Compliance

To ensure compliance with UL or IEC 61800-5-1, use the circuit breakers or fuses listed in this chapter. Circuit breakers must be

designed for protection in a circuit capable of supplying a maximum of 10000 A

rms

(symmetrical), 480 V maximum.

Installation

Operating Guide | VLT® HVAC Basic Drive FC 101

AQ275641848264en-000101 / 132R0078| 31