Danfoss VLT FC 100 Operating Instructions Manual page 39

3 Mechanical Installation
External ducts
If additional duct work is added externally to the Rittal cabinet the
pressure drop in the ducting must be calculated. Use the charts below
to derate the frequency converter according to the pressure drop.
(%)
90
80
70
3 60
50
40
30
20
10
0
0 0.5 4.9
Illustration 3.29: D frame Derating vs. Pressure Change
Drive air flow: 450 cfm (765 m
(%)
90
80
70
60
50
40
30
20
10
0
0 0 0.1
Illustration 3.30: E frame Derating vs. Pressure Change
(Small Fan), P315T5 and P450T7-P500T7
Drive air flow: 650 cfm (1105 m
(%)
90
80
70
60
50
40
30
20
10
0
0 0.2 0.6
Illustration 3.31: E frame Derating vs. Pressure Change
(Large Fan), P355T5-P450T5 and P560T7-P630T7
Drive air flow: 850 cfm (1445 m
38
13 27.3 45.9 66 89.3 115.7 147
Pressure Increase (Pa)
3 /h)
3.6 9.8 21.5 43.4 76 147.1 237.5 278.9
Pressure Change (Pa)
3
/h)
2.2 5.8 11.4 18.1 30.8 69.5 152.8 210.8
Pressure Change (Pa)
3 /h)
MG.11.F3.02 - VLT
VLT HVAC Drive High Power Operating In-
(%)
90
80
70
60
50
40
30
20
10
0
0 25 50 75 100
Illustration 3.32: F1, F2, F3, F4 frame Derating vs. Pres-
sure Change
Drive air flow: 580 cfm (985 m
® is a registered Danfoss trademark
structions
125 150 175 200 225
Pressure Change
3 /h)