Danfoss vlt aqua Design Guide

NOTE!
ETR is activated in par. and is controlled in par. 4-16
Torque Limit Motor Mode . The time before the torque limit warning trips the adjustable frequency
drive is set in par. 14-25
Trip Delay at Torque Limit .
2.15.2 Safe Stop Operation (optional)
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 functionality 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.
Safe stop activation (i.e., removal of 24 V DC voltage supply to terminal 37) does not provide electrical safety.
NOTE!
The safe stop function of the FC 202 can be used for asynchronous and synchronous motors. It may happen that two faults occur in
the adjustable frequency drive's power semiconductor. When using synchronous motors, this may cause a residual rotation. The rotation
can be calculated to Angle=360/(Number of Poles). The application using synchronous motors must take this into consideration and
ensure that this is not a safety-critical issue. This situation is not relevant for asynchronous motors.
NOTE!
In order to use the Safe Stop functionality in conformance with the requirements of EN-954-1 Category 3, a number of conditions must
be fulfilled by the installation of Safe Stop. Please see section
Safe Stop Installation for further information.
NOTE!
The adjustable frequency drive does not provide safety-related protection against unintended or malicious voltage supply to terminal
37 and subsequent reset. Provide this protection via the interrupt device, at the application level, or organizational level.
For more information - see section
Safe Stop Installation .
2 Introduction to the VLT AQUA Drive VLT
®
AQUA Drive Design Guide
2-32 MG.20.N5.22 - VLT
®
is a registered Danfoss trademark
2

Danfoss vlt aqua Specifications

General

Brand	Danfoss
Model	vlt aqua
Category	DC Drives
Language	English