Installation And Cooling Requirements - Danfoss VLT AQUA Drive FC 202 Operating Manual

Mechanical Installation
can accumulate on fan blades causing an imbalance which
prevents the fans from properly cooling the unit.
4.4.3 Potentially Explosive Atmospheres
WARNING
EXPLOSIVE ATMOSPHERE
4 4
Do not install the drive in a potentially explosive
atmosphere. Install the unit in a cabinet outside of this
area. Failure to follow this guideline increases risk of
death or serious injury.
Systems operated in potentially explosive atmospheres
must fulfill special conditions. EU Directive 94/9/EC
(ATEX 95) classifies the operation of electronic devices in
potentially explosive atmospheres.
•
Class d specifies that if a spark occurs, it is
contained in a protected area.
•
Class e prohibits any occurrence of a spark.
Motors with class d protection
Do not require approval. Special wiring and containment
are required.
Motors with class e protection
When combined with an ATEX–approved PTC monitoring
device like the VLT
installation does not need an individual approval from an
approbated organization.
Motors with class d/e protection
The motor itself has an e ignition protection class, while
the motor cabling and connection environment is in
compliance with the d classification. To attenuate the high
peak voltage, use a sine-wave filter at the drive output.
When using a drive in a potentially explosive
atmosphere, use the following:
•
Motors with ignition protection class d or e.
•
PTC temperature sensor to monitor the motor
temperature.
•
Short motor cables.
•
Sine-wave output filters when shielded motor
cables are not used.
NOTICE
MOTOR THERMISTOR SENSOR MONITORING
Drives with the VLT
option are PTB-certified for potentially explosive
atmospheres.
18
VLT® AQUA Drive FC 202
®
PTC Thermistor Card MCB 112, the
®
PTC Thermistor Card MCB 112
Danfoss A/S © 09/2018 All rights reserved.

4.5 Installation and Cooling Requirements

NOTICE
MOUNTING PRECAUTIONS
Improper mounting can result in overheating and
reduced performance. Observe all installation and
cooling requirements.
Installation requirements
•
Ensure unit stability by mounting vertically to a
solid flat surface.
•
Ensure that the strength of the mounting location
supports the unit weight. Refer to
chapter 3.2 Power Ratings, Weight, and Dimensions.
•
Ensure that the mounting location allows access
to open the enclosure door. See
chapter 10.8 Fastener Tightening Torques.
•
Ensure that there is adequate space around the
unit for cooling airflow.
•
Place the unit as near to the motor as possible.
Keep the motor cables as short as possible. See
chapter 10.5 Cable Specifications.
•
Ensure that the location allows for cable entry at
the bottom of the unit.
Cooling and airflow requirements
•
Ensure that top and bottom clearance for air
cooling is provided. Clearance requirement:
225 mm (9 in).
•
Consider derating for temperatures starting
between 45 °C (113 °F) and 50 °C (122 °F) and
elevation 1000 m (3300 ft) above sea level. See
the product-specific design guide for detailed
information.
The drive uses back-channel cooling to circulate the heat
sink cooling air. The cooling duct carries approximately
90% of the heat out of the back channel of the drive.
Redirect the back-channel air from the panel or room by
using:
•
Duct cooling. Back-channel cooling kits are
available to direct the air away from the panel
when an IP20/chassis drive is installed in a Rittal
enclosure. Use of a kit reduces the heat in the
panel and smaller door fans can be specified on
the enclosure.
•
Cooling out the back (top and base 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.
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