8 Maintenance, Diagnostics, and Troubleshooting
8.1 Maintenance and Service
Under normal operating conditions and load profiles, the drive is maintenance-free throughout its designed lifetime. To prevent
breakdown, danger, and damage, examine the drive for loose terminal connections, excessive dust buildup, and so on, at regular
intervals. Replace worn or damaged parts with Danfoss authorized parts. For service and support, contact the local Danfoss supplier.
WARNING
UNINTENDED START
When the drive is connected to the AC mains, DC supply, or load sharing, the motor may start at any time, causing risk of death,
serious injury, and equipment or property damage. The motor may start by activation of an external switch, a fieldbus
command, an input reference signal from the LCP or LOP, via remote operation using MCT 10 Set-up software, or after a cleared
fault condition.
-
Press [Off] on the LCP before programming parameters.
-
Disconnect the drive from the mains whenever personal safety considerations make it necessary to avoid unintended
motor start.
-
Check that the drive, motor, and any driven equipment are in operational readiness.
8.2 Heat Sink Service
8.2.1 Heat Sink Access Panel
The drive can be ordered with an optional access panel in the back of the unit. This access panel provides access to the heat sink and
allows the heat sink to be cleaned of any dust buildup.
8.2.2 Removing Dust Buildup from the Heat Sink
Context:
NOTICE
DAMAGE TO HEAT SINK
Using fasteners that are longer than the fasteners originally supplied with the heat sink panel can damage the heat sink cooling
fins.
Procedure
1. Remove power from the drive and wait 40 minutes for the capacitors to discharge completely. Refer to 2.3 Safety Precautions.
2. Position the drive so that the back of the drive is fully accessible.
3. Remove the 8 M5 fasteners securing the access panel to the back of the enclosure using a 3 mm hex bit.
4. Inspect the leading edge of the heat sink for damage or debris.
5. Remove material or debris with a vacuum.
6. Reinstall the panel and secure it to the back of the enclosure with the 8 fasteners. Tighten the fasteners according to
9.10 Fastener
Torque Ratings.
Maintenance, Diagnostics, and
Troubleshooting
Operating Guide | VLT® Refrigeration Drive FC 103
AQ275652766279en-000101 / 130R0707
94 | Danfoss A/S © 2020.01
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