3.2.3.14 Enclosure size I7, I8
91
L1
92
L2
93
L3
96
U
97
V
98
W
88
DC-
99
95
e
3
0
b
c
2
4
8
.1
0
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
Danfoss A/S © 2019.11
Summary of Contents for VLT HVAC Basic Drive FC 101
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