Danfoss VLT AutomationDrive FC 302 Programming Manual page 62

Parameter Descriptions
2-15 Brake Check
Option:
[5] Trip Lock
NOTICE
3 3
Remove a warning arising in connection with [0] Off or
[1] Warning by cycling the mains supply. The fault must
be corrected first. For [0] Off or [1] Warning, the
frequency converter keeps running even if a fault is
located.
2-16 AC brake Max. Current
Range:
100 % [ 0 - 1000.0 %] Enter the maximum permissible current
*
NOTICE
Parameter 2-16 AC brake Max. Current has no effect when
1-10 Motor Construction = [1] PM, non salient SPM.
2-17 Over-voltage Control
Option:
[0] Disabled
*
[1] Enabled (not
at stop)
[2] Enabled
NOTICE
Do not enable OVC in hoisting applications.
2-18 Brake Check Condition
Range:
[0] At Power Up
*
[1] After Coast Situations Brake check is performed after coast
60
VLT
Function:
Function:
when using AC brake to avoid
overheating of motor windings.
Function:
Overvoltage control (OVC) reduces the risk
of the frequency converter tripping due to
an overvoltage on the DC link caused by
generative power from the load.
No OVC required.
Activates OVC except when using a stop
signal to stop the frequency converter.
Activates OVC.
Function:
Brake check is performed at power
up.
situations.
®
AutomationDrive FC 301/302 Programming Guide
2-19 Over-voltage Gain
Range:
100 %
*
3.4.3 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 [32]
Mechanical Brake Control for applications with an electro-
magnetic brake in parameter 5-40 Function Relay,
5-30 Terminal 27 Digital Output, or 5-31 Terminal 29 Digital
Output. When selecting [32] Mechanical brake control, the
mechanical brake is closed from start up until the output
current is above the level selected in
parameter 2-20 Release Brake Current. During stop, the
mechanical brake activates when the speed falls below the
level specified in parameter 2-21 Activate Brake Speed [RPM].
If the frequency converter enters an alarm condition or an
overcurrent or overvoltage situation, the mechanical brake
immediately cuts in. This is also the case during Safe
Torque Off.
NOTICE
Protection mode and trip delay features
(parameter 14-25 Trip Delay at Torque Limit and
parameter 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.
MG33MI02 - Rev. 2013-11-20
Function:
[0 - 200 %] Select overvoltage gain.