Danfoss VLT MCA 117 Operating Manual page 9

Operating Guide | VLT® FCD 300 PROFIBUS Converter MCA 117
UNINTENDED START
When the drive is connected to the AC mains, 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.
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Disconnect the drive from the mains whenever personal safety considerations make it necessary to avoid unintended
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motor start.
Check that the drive, motor, and any driven equipment are in operational readiness.
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DISCHARGE TIME
The drive contains DC-link capacitors, which can remain charged even when the drive is not powered. High voltage can be
present even when the warning indicator lights are off.
Failure to wait the specified time after power has been removed before performing service or repair work could result in death
or serious injury.
Stop the motor.
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Disconnect AC mains, permanent magnet type motors, and remote DC-link supplies, including battery back-ups, UPS, and
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DC-link connections to other drives.
Wait for the capacitors to discharge fully. The time for full discharge of the capacitors is minimum 4 minutes for VLT®
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Decentral Drive FCD 302, 400 V AC, 0.37–3.0 kW (0.5–4.0 hp).
Before performing any service or repair work, use an appropriate voltage measuring device to make sure that the capacitors
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are fully discharged.
LEAKAGE CURRENT HAZARD
Leakage currents exceed 3.5 mA. Failure to ground the drive properly can result in death or serious injury.
Ensure the correct grounding of the equipment by a certified electrical installer.
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ROTATING SHAFTS
Contact with rotating shafts and electrical equipment can result in death or serious injury.
Ensure that only trained and qualified personnel perform installation, start-up, and maintenance.
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Ensure that electrical work conforms to national and local electrical codes.
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Follow the procedures in this guide.
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Danfoss A/S © 2019.11
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