2-16 AC brake Max. Current
Range:
Function:
100.0 %
*
[Application dependant]
NOTE!
2-16 AC brake Max. Current
will not have effect when
1-10 Motor Construction
= [1] PM, non-salient SPM.
2-17 Over-voltage Control
Option:
Function:
Overvoltage control (OVC) reduces the risk
of the Adjustable frequency drive tripping
due to an overvoltage 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 Adjustable frequency
drive.
[2]
Enabled
Activates OVC.
NOTE!
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 overvoltage gain.
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 Adjustable frequency drive 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
5-40 Function Relay
,
5-30 Terminal
27 Digital Output
, or
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
2-20 Release Brake Current
.
During stop, the mechanical brake activates when the
speed falls below the level specified in
2-21 Activate Brake
Speed [RPM]
. If the Adjustable frequency drive enters an
alarm condition or an overcurrent or overvoltage situation,
the mechanical brake immediately cuts in. This is also the
case during safe stop.
NOTE!
Protection mode and trip delay features (
14-25 Trip Delay
at Torque Limit
and
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.
Parameter Descriptions
FC 300 Programming Guide
MG33MD22 - VLT
®
is a registered Danfoss trademark
3-31
3
3
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