Danfoss vlt series Operating Instructions Manual page 31

How to Install
The fan runs for the following reasons:
•
AMA.
•
DC Hold.
•
Pre-Mag.
•
DC Brake.
•
60% of nominal current is exceeded.
•
Specific heat sink temperature exceeded (power
size dependent).
The fan runs for minimum 10 minutes.
External ducts
If more duct work is added externally to the Rittal cabinet,
calculate the pressure drop in the ducting. To derate the
frequency converter according to the pressure drop, refer
to Illustration 3.22.
(%)
90
80
70
60
50
40
30
20
10
0
0 25 50 75 100
Illustration 3.22 Enclosure Size F, Derating vs. Pressure Change
(Pa)
Drive air flow: 985 m 3 /h (580 cfm)
MG34Q402
Operating Instructions
125 150 175 200 225
Pressure Change
Danfoss A/S © 04/2016 All rights reserved.
3.2.6 Gland/Conduit Entry – IP21 (NEMA 1)
and IP54 (NEMA12)
Cables are connected through the gland plate from the
bottom. Remove the plate and plan where to place the
entry for the glands or conduits. Prepare holes in the
shaded areas on the drawings in Illustration 3.24 to
Illustration 3.31.
NOTICE
To ensure the specified protection degree, and proper
cooling of the unit, fit the gland plate to the frequency
converter. If the gland plate is not mounted, the
frequency converter may trip on alarm 69, Pwr. Card
Temp
Illustration 3.23 Example of Proper Installation of the Gland
Plate
70.0
(2.76)
535.0
(21.06)
35.5
(1.40)
36.5
(1.44)
Illustration 3.24 F8, Cable Entry Viewed from the Bottom of
the Frequency Converter
593.0
(23.33)
99.5
(7.85)
258.5
(10.18)
733.0
(28.86)
29
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