Avoid Unintended Start; Safe Stop - Danfoss VLT HVAC Drive FC 100 Operating Instructions Manual

®
VLT HVAC DRIVE High Power
Operating Instruction
2.1.5. Before Commencing Repair Work
1.
2.
3.
4.

2.1.6. Avoid Unintended Start

While the frequency converter is connected to mains, the motor can be started/stop-
ped using digital commands, bus commands, references or via the Local Control Panel
(LCP):
•
•
•

2.1.7. Safe Stop

The frequency converter can perform the safety function
IEC 61800-5-2) or
It is designed and approved suitable for the requirements of Safety Category 3 in EN 954-1. This
functionality is called Safe Stop. Prior to integration and use of Safe Stop in an installation, a
thorough risk analysis on the installation must be carried out in order to determine whether the
Safe Stop functionality and safety category are appropriate and sufficient. In order to install and
use the Safe Stop function in accordance with the requirements of Safety Category 3 in EN 954-1,
the related information and instructions of the relevant Design Guide must be followed! The in-
formation and instructions of the Operating Instructions are not sufficient for a correct and safe
use of the Safe Stop functionality!
Illustration 2.1: Diagram showing all electrical terminals. (Terminal 37 present for units with Safe Stop Func-
tion only.)
Disconnect the frequency converter from mains
Wait for discharge of the DC-link. See period of time on the warning label.
Disconnect DC bus terminals 88 and 89
Remove motor cable
Disconnect the frequency converter from mains whenever personal safety considerations
make it necessary to avoid unintended start.
To avoid unintended start, always activate the [OFF] key before changing parameters.
An electronic fault, temporary overload, a fault in the mains supply, or lost motor con-
nection may cause a stopped motor to start. The frequency converter with Safe Stop
provides protection against unintended start, if the Safe Stop Terminal 37 is deactivated
or disconnected.
Stop Category 0 (as defined in EN 60204-1).
MG.11.F1.02 - VLT ® is a registered Danfoss trademark
2. Safety Instructions and General Warning
Safe Torque Off (As defined by draft CD
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