NB!
Please see the
Duct Kit Instruction Manual,
175R5640,
for further information
External ducts
If additional duct work is added externally to the Rittal cabinet the
pressure drop in the ducting must be calculated. Please see section
Cooling and Airflow
for further information.
3.4.2 Installation of Top-only Duct Cooling Kit
This description is for the installation of the top section only of the
back-channel cooling kits available for frame sizes D3, D4 and E2. In
addition to the enclosure a 200 mm vented pedestal is required.
The minimum enclosure depth is 500 mm (600 mm for E2 frame) and
the minimum enclosure width is 600 mm (800 mm for E2 frame). The
maximum depth and width are as required by the installation. When
using multiple frequency converters in one enclosure mount each drive
on its own back panel and support along the mid-section of the panel.
The back-channel cooling kits are very similar in construction for all
frames. The D3 and D443 and 44 kits do not support “in frame” mount-
ing of the frequency converters. The E2 kit is mounted “in frame” for
additional support of the frequency converter.
Using these kits as described removes 85% of the losses via the back
channel using the drive’s main heat sink fan. The remaining 15% must
be removed via the door of the enclosure.
NB!
Please see the
Top-Only Back-Channel Cooling Kit In-
struction, 175R1107,
for further information.
Ordering information
Frame size D3 and D4: 176F1775
Frame size E2: 176F1776
3.4.3 Installation of Top and Bottom Covers for Rittal Enclosures
The top and bottom covers, installed onto IP00 frequency converters,
direct the heat sink cooling air in and out the back of the frequency
converter. The kits are applicable to IP00 drive frames D3, D4 and E2.
These kits are designed and tested to be used with IP00/Chassis drives
in Rittal TS8 enclosures.
Notes:
1.
If external duct work is added to the exhaust path of the
drive, additional back pressure will be created that will reduce
the cooling of the drive. The drive must be derated to accom-
modate the reduced cooling. First, the pressure drop must be
calculated, then refer to the derating tables located earlier in
this section.
2.
A doorfan(s) is required on the enclosure to remove the heat
losses not contained in the backchannel of the drive and any
additional losses generated from other components installed
inside the enclosure. The total required air flow must be calcu-
lated so that the appropriate fans can be selected. Some en-
closure manufacturers offer software for performing the calcu-
lations (i.e. Rittal Therm software).
If the frequency converter is the only heat generating compo-
nent in the enclosure, the minimum airflow required at an am-
bient temperature of 45
°
C for the D3 and D4 frame drives is
391 m
3
/h (230 cfm). The minimum airflow required at an am-
bient temperature of 45
°
C for the E2 frame drive is 782 m
3
/h
(460 cfm).
NB!
Please see the instruction for
Top and Bottom Covers
- Rittal Enclosure, 177R0076,
for further information.
Ordering information
Frame size D3: 176F1781
Frame size D4: 176F1782
Frame size E2: 176F1783
3.4.4 Installation of Top and Bottom Covers
Top and bottom covers can be installed on frame sizes D3, D4 and E2.
These kits are designed to be used to direct the back-channel airflow in
and out the back of the drive as opposed to in the bottom and out the
top of the drive (when the drives are being mounted directly on a wall
or inside a welded enclosure).
Notes:
1.
If external duct work is added to the exhaust path of the
drive, additional back pressure will be created that will reduce
the cooling of the drive. The drive must be derated to accom-
modate the reduced cooling. First, the pressure drop must be
calculated, then refer to the derating tables located earlier in
this section.
2.
A doorfan(s) is required on the enclosure to remove the heat
losses not contained in the backchannel of the drive and any
additional losses generated from other components installed
inside the enclosure. The total required air flow must be calcu-
lated so that the appropriate fans can be selected. Some en-
VLT HVAC Drive High Power Operating In-
structions
3 Mechanical Installation
MG.11.F3.02 - VLT
®
is a registered Danfoss trademark
43
3