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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
60
50
40
30
20
10
0
0
0.5
4.9
13
27.3
45.9
66
89.3 115.7 147
(%)
(Pa)
Pressure Increase
Dr
iv
e D
er
ating
130BB007.10
Illustration 7.39 D frame Derating vs. Pressure Change
Drive air flow: 450 cfm (765 m
3
/h)
90
80
70
60
50
40
30
20
10
0
(%)
Dr
iv
e D
er
ating
0
0
0.1
3.6
9.8 21.5 43.4
76
237.5
278.9
(Pa)
Pressure Change
130BB010.10
147.1
Illustration 7.40 E frame Derating vs. Pressure Change (Small
Fan), P250T5 and P355T7-P400T7
Drive air flow: 650 cfm (1105 m
3
/h)
90
80
70
60
50
40
30
20
10
0
(%)
Dr
iv
e D
er
ating
0
0.2
0.6
2.2
5.8
11.4 18.1 30.8
152.8 210.8
(Pa)
Pressure Change
130BB011.10
69.5
Illustration 7.41 E frame Derating vs. Pressure Change (Large
Fan), P315T5-P400T5 and P500T7-P560T7
Drive air flow: 850 cfm (1445 m
3
/h)
90
80
70
60
50
40
30
20
10
0
(%)
Dr
iv
e D
er
ating
0
25
50
75
100
125
150
175
225
130BB190.10
200
Pressure Change
Illustration 7.42 F1, F2, F3, F4 frame Derating vs. Pressure
Change
Drive air flow: 580 cfm (985 m
3
/h)
7.2.8 Installation on the Wall - IP21 (NEMA
1) and IP54 (NEMA 12) Units
This only applies to frame sizes D1 and D2 . It must be
considered where to install the unit.
Take the relevant points into consideration before you
select the final installation site:
•
Free space for cooling
•
Access to open the door
•
Cable entry from the bottom
Mark the mounting holes carefully using the mounting
template on the wall and drill the holes as indicated.
Ensure proper distance to the floor and the ceiling for
cooling. A minimum of 225 mm (8.9 inch) below the
frequency converter is needed. Mount the bolts at the
bottom and lift the frequency converter up on the bolts.
Tilt the frequency converter against the wall and mount
the upper bolts. Tighten all four bolts to secure the
frequency converter against the wall.
176F
A245.10
Illustration 7.43 Lifting method for mounting drive on wall
Mechanical Installation - ...
FC 300 Design Guide
152
MG.33.BD.02 - VLT
®
is a registered Danfoss trademark
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