Danfoss VLT AutomationDrive FC 300 Programming Guide

2-17 Over-voltage Control
Option: Function:
Over-voltage control (OVC) reduces the risk of the frequency converter tripping due to an over
voltage on the DC link caused by generative power from the load.
[0] * Disabled No OVC required.
[1] Enabled (not at stop) Activates OVC except when using a stop signal to stop the frequency converter.
[2] Enabled Activates OVC.
NB!
OVC must not be enabled in hoisting applications.
2-18 Brake Check Condition
Range: Function:
[0] * At Power Up Brake check will be performed at power up
[1] After Coast Situations Brake check will be performed after coast situations
2-19 Over-voltage Gain
Range: Function:
100 %* [0 - 200 %] Select over-voltage gain.
3.4.4 2-2* Mechanical Brake
Parameters for controlling operation of an electro-magnetic (mechanical) brake, typically required in hoisting applications.
To control a mechanical brake, a relay output (relay 01 or relay 02) or a programmed digital output (terminal 27 or 29) is required. Normally this output
must be closed during periods when the frequency converter is unable to ‘hold’ the motor, e.g. due to an excessive load. Select
Mechanical Brake
Control
[32] for applications with an electro-magnetic brake in par. 5-40 Function Relay , par. 5-30 Terminal 27 Digital Output , or par. 5-31 Terminal 29
Digital Output
. When selecting Mechanical brake control [32], the mechanical brake is closed from start up until the output current is above the level
selected in par. 2-20
Release Brake Current . During stop, the mechanical brake activates when the speed falls below the level specified in par. 2-21 Activate
Brake Speed [RPM]
. If the frequency converter enters an alarm condition or an over-current or over-voltage situation, the mechanical brake immediately
cuts in. This is also the case during safe stop.
NB!
Protection mode and trip delay features (par. 14-25
Trip Delay at Torque Limit and par. 14-26 Trip Delay at Inverter Fault ) may delay
the activation of the mechanical brake in an alarm condition. These features must be disabled in hoisting applications.
3 Parameter descriptions FC 300 Programming Guide
68 MG.33.M8.02 - VLT
®
is a registered Danfoss trademark
3

Danfoss VLT AutomationDrive FC 300 Specifications

General

Brand	Danfoss
Model	VLT AutomationDrive FC 300
Category	DC Drives
Language	English