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Crane System Design
1.
Use the shielded cable between the sine-wave filter
and frequency converter.
2.
Keep the unshielded cable away from the mains
cable. The two cables should not be run in parallel.
3.
If the installation requires to route the motor cables
and mains cables in parallel, keep a distance of at
least 45cm between the two cables. Separate the
cables by placing them in different cable trays or in
different sections of a cable tray.
4.
Use continuous cable trays and avoid "ladder-type"
cable trays.
5.
Route the motor cable along the metallic grounded
conductors such as cable trays, rails from the
building structure, pipes, etc.
3.1.7 Grounding Concept
•
Do the common grounding between AFE and
motor drives.
•
The output filters and LCL should have low
impedance grounding to the AFE and motor
frequency drives.
•
Ensure low impedance between entire crane
construction and the cabinets and the transformer.
•
Use only one connection to the transformer.
3.1.8 Cooling and Airflow
Cooling
Cooling can be obtained, by using the cooling ducts in the
bottom and the top of the unit, by taking air in and out of
the back of the unit or by combining the cooling
possibilities.
Duct cooling
A dedicated option has been developed to optimize instal-
lation of IP00/chassis frequency converters in Rittal TS8
enclosures utilizing the fan of the frequency converter for
forced air cooling of the backchannel. The air out of the top
of the enclosure could but ducted outside a facility so the
heat losses from the backchannel are not dissipated within
the control room reducing air-conditioning requirements of
the facility.
Please see Installation of Duct Cooling Kit in Rittal enclosures,
for further information.
Back cooling
The backchannel air can also be ventilated in and out of the
back of a Rittal TS8 enclosure. This offers a solution where
the backchannel could take air from outside the facility and
return the heat losses outside the facility thus reducing air-
conditioning requirements.
®
VLT
Active Front End AFE 302 Operating Instructions Liebherr
NOTE
The ideal cooling air is dry and clean. When the air from
outside is used, filter mats and long air inlets could prevent
the dirty air problem. The condensation inside the frequency
converter, from the humid air, may require the drain outlet.
NOTE
A door/top fan(s) is required on the enclosure to remove the
heat losses not contained in the backchannel of the
frequency converter and any additional losses generated
from other components installed inside the enclosure. The
total required air flow must be calculated so that the
appropriate fans can be selected. Some enclosure manufac-
turers offer software for performing the calculations (i.e.
Rittal Therm software). If the VLT is the only heat generating
component in the enclosure, the minimum airflow required
at an ambient temperature of 45
sizes is 391m
an ambient temperature of 45
782m
Airflow
Table 3.1 shows the necessary airflow over the heat sink.
Enclosure
protection
IP21 / NEMA 1
IP54 / NEMA 12
IP21 / NEMA 1
IP54 / NEMA 12 F1, F2, F3 and
IP00 / Chassis
* Airflow per fan. Frame size F contain multiple fans.
Table 3.1 Heatsink Air Flow
®
MG.33.X2.02 - VLT
is a registered Danfoss trademark
o
C for the D3 and D4 frame
3
/h (230cfm). The minimum airflow required at
o
C for the E2 frame size is
3
/h (460cfm).
Door fan(s)/
Frame size
Top fan airflow
D1 and D2
170m
cfm)
E1 P250T5,
340m
P355T7,
cfm)
P400T7
E1P315-
340m
P400T5, P500-
cfm)
P560T7
F1, F2, F3 and
700m
F4
cfm)*
525m
F4
cfm)*
D3 and D4
255m
cfm)
E2 P250T5,
255m
P355T7,
cfm)
P400T7
E2 P315-
255m
P400T5, P500-
cfm)
P560T7
Heatsink fan(s)
3
/h (100
765m
3
/h (450
cfm)
3
3
/h (200
1105m
/h (650
cfm)
3
/h (200
1445m
3
/h (850
cfm)
3
3
/h (412
985m
/h (580
cfm)*
3
/h (309
985m
3
/h (580
cfm)*
3
3
/h (150
765m
/h (450
cfm)
3
3
/h (150
1105m
/h (650
cfm)
3
3
/h (150
1445m
/h (850
cfm)
9
3
3
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