2-16 AC brake Max. Current
Range:
Function:
100 %
*
[ 0 - 1000.0 %] Enter the maximum allowed current
when using AC braking to avoid
overheating of motor windings.
NOTICE
Parameter 2-16 AC brake Max. Current
has no effect when
parameter 1-10 Motor Construction
=
[1] PM, non salient
SPM.
2-17 Over-voltage Control
Option:
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.
[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.
NOTICE
Do not enable OVC in hoisting applications.
2-18 Brake Check Condition
Range:
Function:
[0]
*
At Power Up
Brake check is performed at power-
up.
[1]
After Coast Situations Brake check is performed after coast
situations.
2-19 Over-voltage Gain
Range:
Function:
100 %
*
[10 - 200 %]
Select overvoltage gain.
3.3.3 2-2* Mechanical Brake
Parameters for controlling operation of an electro-magnetic
(mechanical) brake, typically required in hoisting
applications.
To control a mechanical braking, 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, for example due to an excessive load.
Select
[32] Mechanical Brake Control
for applications with
an electro-magnetic brake in
parameter 5-40 Function Relay
,
parameter 5-30 Terminal 27 Digital Output
, or
parameter 5-31 Terminal 29 Digital Output
. When selecting
[32] Mechanical brake control
, the mechanical braking 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 braking activates when the
speed drops below the level specified in
parameter 2-21 Activate Brake Speed [RPM]
. If the frequency
converter enters an alarm condition, an overcurrent, or
overvoltage situation, the mechanical braking 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 braking in an alarm
condition. These features must be disabled in hoisting
applications.
Parameter Descriptions
Programming Guide
MG33MP02
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Summary of Contents for VLT AutomationDrive FC 302
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