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 45 cm 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
The cooling air can be channeled through the air ducts at
the top and bottom of the unit, through the back of the
unit, or through the combination of the both methods.
Duct cooling
The duct cooling kit is used to install IP00/chassis D and E-
frame frequency converters in the Rittal TS8 enclosure.
See
Installation of Duct Cooling Kit in Rittal enclosures
, for
further information.
Back cooling
The D and E frame frequency converters can be mounted
in the Rittal cabinet where the cabinet backplate has
cutout, through which the back-channel cooling is
available.
NOTICE
The ideal cooling air is clean and dry. When the cooling
air is from outside, the filter mats and long air inlet may
be considered to prevent the dirty air problem. When
the application environment is humid, consider the
condensation of the frequency converter which may
require the drain outlet.
NOTICE
The door fan(s) is required on the Rittal cabinet to
remove the heat losses from the frequency converter
and other components inside the enclosure. The total air
flow required must be calculated and the appropriate
fan can be selected. Rittal Therm software can calculate
the cooling air flow volume. If the frequency converter is
the only heat generating source in the enclosure, the
minimum airflow required at an ambient temperature of
45
°
C for the D3 and D4 frame sizes is 391 m
3
/h (230
cfm). The minimum airflow required at an ambient
temperature of 45
°
C for the E2 frame size is 782 m
3
/h
(460 cfm).
Airflow
shows the necessary airflow over the heat sink.
Enclosure
protection
Frame size
Door
fan(s)/Top fan
airflow
Heatsink
fan(s)
IP54/NEMA 12
F1, F2, F3 and
F4
525 m
3
/h (309
cfm)*
985 m
3
/h (580
cfm)*
IP00/Chassis
D3 and D4
255 m
3
/h (150
cfm)
765 m
3
/h (450
cfm)
E2 P400T7
255 m
3
/h (150
cfm)
1105 m
3
/h
(650 cfm)
E2 P500-
P560T7
255 m
3
/h (150
cfm)
1445 m
3
/h
(850 cfm)
* Airflow per fan. Frame size F contain multiple fans.
Table 3.2 Heatsink Air Flow
NOTICE
The fan runs for the following reasons:
1.
AMA
2.
DC Hold
3.
Pre-Mag
4.
The frequency converter current exceeds 60%
of its nominal current rating.
5.
The heat sink temperature exceeds its limit. The
limit depends on the power size.
When the fan is activated, it will run for a minimum of
10 min.
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.
Crane System Design
Operating Instructions
MG33X402
Danfoss A/S © Rev. 05/2014 All rights reserved.
9
3
3
Содержание VLT Active Front End AFE 302
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