Fuses - Danfoss VLT Refrigeration Drive FC 103 Operating Instructions Manual

Specifications
Generic specifications
Filter efficiency
Typical average switching frequency
Response time (reactive and harmonic)
Settling time - reactive current control
Settling time - harmonic current control
Overshoot - reactive current control
Overshoot - harmonic current control
8.3.1 Derating for Altitude
The cooling capability of air is decreased at lower air
pressure.
Below 1000 m altitude, no derating is necessary, but above
1000 m, derate the ambient temperature (T
maximum output current (I
out
Illustration 8.10.
An alternative is to lower the ambient temperature at high
altitudes and thereby ensure 100% output current at high
altitudes. As an example of how to read the graph, the
situation at 2000 m is elaborated. At a temperature of
45 °C (T
- 3.3 K), 91% of the rated output current is
AMB, MAX
available. At a temperature of 41.7 °C, 100% of the rated
output current is available.
I (%)
OUT
100
95
90
85
80
0 500 1000 1500
Altitude (metres above sea level)*
Illustration 8.10 Altitude Derating
MG16N102
Operating Instructions
) or
AMB
) in accordance with
2000 2500 3000
Danfoss A/S © 08/2015 All rights reserved.
110
100
90
80
70
60
50
40
30
20
10
0
0 5 10 15 20 25
Tamb (Max) Deg C
Illustration 8.11 Input/Output vs. Maximum Ambient
Temperature

8.4 Fuses

Danfoss recommends using fuses and/or circuit breakers
on the supply side as protection in case of component
break-down inside the frequency converter (first fault).
NOTICE
Using fuses and/or circuit breakers ensures compliance
with IEC 60364 for CE or NEC 2009 for UL.
Branch circuit protection
To protect the installation against electrical and fire hazard,
all branch circuits in an installation, switch gear, machines,
and so on, must be protected against short-circuit and
overcurrent according to national/international regulations.
NOTICE
The recommendations do not cover branch circuit
protection for UL.
Short-circuit protection
Danfoss recommends using the fuses/circuit breakers in
chapter 8.4.2 Fuse Tables to protect service personnel and
property in case of component break-down in the
frequency converter.
97%
3.0–4.5 kHz
<0.5 ms
<20 ms
<20 ms
<10%
<10%
30 35 40 45 50 55
95
8 8