Safe Stop Operation - Danfoss VLT AQUA Drive Design Manual

2. Introduction to the VLT AQUA Drive
2.15.1. Motor Thermal Protection
The motor temperature is calculated on the basis of motor current, output frequency, and time
or thermistor. See par. 1-90 in the chapter
2

2.15.2. Safe Stop Operation

The FC 202 can perform the Safety Function "Uncontrolled Stopping by removal of power" (as
defined by draft IEC 61800-5-2) or Stop Category 0 (as defined in EN 60204-1).
It is designed and deemed suitable for the requirements of Safety Category 3 in EN 954-1. This
function is called safe stop.
Prior to integration and use of the FC 202 Safe Stop in an installation, a thorough risk analysis on
the installation must be carried out in order to determine whether the FC 202 Safe Stop function-
ality and safety category are appropriate and sufficient.
The safe stop function is activated by removing the voltage at Terminal 37 of the safe inverter.
By connecting the safe inverter to external safety devices providing a safe relay, an installation
for a safe Stop Category 1 can be obtained. The safe stop function of the FC 202 can be used for
asynchronous and synchronous motors.
40
Safe stop activation (i.e., removal of 24 V DC voltage supply to terminal 37) does
not provide electrical safety.
MG.20.N2.22 - VLT
How to Program
.
® is a registered Danfoss trademark.
VLT ® AQUA Drive Design Guide