Mechanical Installation; Cooling; Lifting - Danfoss VLT FC 103 Operating Instructions Manual

Installation

2.3 Mechanical Installation

2.3.1 Cooling

• •
Top and bottom clearance for air cooling must be
provided. Generally, 225 mm (9 in) is required.
•
Improper mounting can result in over heating
and reduced performance
•
Derating for temperatures starting between 45 C
(113 F) and 50 C (122 F) and elevation 1000 m
(3300 ft) above sea level must be considered. See
VLT Design Guide for detailed information.
The high power frequency converters utilise a back-
channel cooling concept that removes heatsink cooling air,
which carries approximately 90% of the heat out of the
back channel of the frequency converters. The back-
channel air can be redirected from the panel or room
using one of the kits below.
Duct cooling
A back-channel cooling kit is available to direct the
heatsink cooling air out of the panel when an IP20/chassis
frequency converters is installed in a Rittal enclosure. Use
of this kit reduces the heat in the panel and smaller door
fans can be specified on the enclosure.
Cooling out the back (top and bottom covers)
The back channel cooling air can be ventilated out of the
room so that the heat from the back channel is not
dissipated into the control room.
A door fan(s) is required on the enclosure to remove the
heat not contained in the backchannel of the frequency
converters and any additional losses generated by other
components inside the enclosure. The total required air
flow must be calculated so that the appropriate fans can
be selected.
Airflow
The necessary airflow over the heat sink must be secured.
The flow rate is shown in Table 2.3.
The fan runs for the following reasons:
•
AMA
•
DC Hold
•
Pre-Mag
•
DC Brake
•
60% of nominal current is exceeded
•
Specific heatsink temperature exceeded (power
size dependent)
•
Specific Power Card ambient temperature
exceeded (power size dependent)
•
Specific Control Card ambient temperature
exceeded
inverter.ru (812) 702-47-50
VLT Refrigeration Drive Operating Instructions
Frame
D1h/D3h
D2h/D4h
Table 2.3 Airflow

2.3.2 Lifting

Always lift the frequency converter using the dedicated
lifting eyes. Use a bar to avoid bending the lifting holes.
CAUTION
The angle from the top of the frequency converter to the
lifting cables should be 60 or greater.
Illustration 2.1 Recommended Lifting Method
MG16J102 - VLT is a registered Danfoss trademark
Door fan/top fan Heatsink fan
3
102 m /hr (60 CFM) 420 m
3
204 m /hr (120 CFM) 840 m
3
/hr (250 CFM)
3
/hr (500 CFM)
2
9
2