Danfoss VLT AQUA Drive FC 202 Design Manual page 99

How to Install
The following conditions activate fans on the D-Frame:
•
Output current greater than 60% of nominal
•
IGBT over temperature
•
IGBT low temperature
•
Control card over temperature
•
DC hold active
•
DC brake active
•
Dynamic brake circuit active
•
During pre-magnetization of the motor
•
AMA in progress
In addition to these conditions, the fans are always started
shortly after mains input power is applied to the frequency
converter. Once fans are started, they run for a minimum
of one minute.
The following conditions activate fans on the E- and F-
frames:
1. AMA
2. DC Hold
3. Pre-Mag
4. DC Brake
5. 60% of nominal current is exceeded
6. Specific heatsink temperature exceeded (power
size dependent).
7. Specific power card ambient temperature
exceeded (power-size dependent)
8. Specific control card ambient temperature
exceeded
External ducts
If more duct work is added externally to the Rittal cabinet
the pressure drop in the ducting must be calculated. Use
the derating charts to derate the frequency converter
according to the pressure drop.
(%)
90
80
70
60
50
40
30
20
10
0
0 0.5 4.9 13 27.3
Pressure Increase
Illustration 5.24 D-Frame Derating vs. Pressure Change
Frequency Converter Air Flow: 450 cfm (765 m
®
VLT AQUA Drive FC 202 Design Guide
45.9 66 89.3 115.7 147
(Pa)
3
/h)
®
MG20Z102 - VLT is a registered Danfoss trademark
(%)
90
80
70
60
50
40
30
20
10
0
0 0 0.1 3.6 9.8 21.5 43.4
Pressure Change
Illustration 5.25 E-Frame Derating vs. Pressure Change (Small
Fan), P250T5 and P355T7-P400T7
Frequency Converter Air Flow: 650 cfm (1,105 m
(%)
90
80
70
60
50
40
30
20
10
0
0 0.2 0.6 2.2 5.8 11.4 18.1 30.8
Pressure Change
Illustration 5.26 E-Frame Derating vs. Pressure Change (Large
Fan), P315T5-P400T5 and P500T7-P560T7
Frequency Converter Air Flow: 850 cfm (1,445 m
(%)
90
80
70
60
50
40
30
20
10
0
0 25 50 75 100
Pressure Change
Illustration 5.27 F1, F2, F3, F4 Frame Derating vs. Pressure
Change
Frequency Converter Air Flow: 580 cfm (985 m
76 147.1 237.5 278.9
(Pa)
3
/h)
69.5 152.8 210.8
(Pa)
3
/h)
125 150 175 200 225
3
/h)
97
5 5