Safety And Precautions; Safety Instructions; Avoid Unintended Start - Danfoss MCO 101 Manual

Extended and Advanced Cascade Controller
Option

1 Safety and precautions

1.1.1 High Voltage Warning
The voltage of the adjustable frequency drive and the MCO 101 option card is dangerous whenever they are connected to line power.
Incorrect installation of the motor or adjustable frequency drive may cause damage to the equipment, serious injury or death. Con-
sequently, it is essential to comply with the instructions in this manual as well as local and national rules and safety regulations.

1.1.2 Safety Instructions

Prior to using functions that directly or indirectly influence personal safety (e.g., Safe Stop or other functions either forcing the motor
to stop or attempting to keep it functioning), a thorough risk analysis and system test must be carried out. The system tests
must include testing failure modes regarding the control signaling (analog and digital signals and serial communication.
• Make sure the adjustable frequency drive is properly grounded.
• Do not remove AC line input connections, motor connections or other power connections while the adjustable frequency drive is connected to
line power.
• Protect users against supply voltage.
• Protect the motor against overloading in accordance with national and local regulations.
• The ground leakage current exceeds 3.5 mA.
• The [OFF] key is not a safety switch. It does not disconnect the adjustable frequency drive from line power.

1.1.3 Avoid unintended Start.

While the adjustable frequency drive is connected to line power, the motor can be started/stopped using digital commands, bus commands, references
or via the Local Control Panel.
• Disconnect the adjustable frequency drive and the MCO 101 option card from line power whenever personal safety considerations make it
necessary to avoid the unintended start of a motor.
• To avoid an unintended starts, always activate the [OFF] key before changing parameters.
®
MI.38.C2.22 - VLT is a registered Danfoss trademark
1 Safety and precautions
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