Danfoss VLT AutomationDrive FC 301 Programming Manual page 58

Parameter Descriptions
2-15 Brake Check
Option: Function:
3 3
[0] Off Monitors brake resistor and brake IGBT for a short-
*
circuit during operation. If a short-circuit occurs,
warning 25 appears.
NOTICE
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
*
%]
NOTICE
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
56
3. If the DC-link ripple amplitude while braking
is lower than the DC link ripple amplitude
before braking + 1%: Brake check has failed
by returning a warning or alarm.
4. If the DC-link ripple amplitude while braking
is higher than the DC-link ripple amplitude
before braking + 1%: Brake check is OK.
Function:
Enter the maximum permissible current
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.
®
VLT AutomationDrive FC 301/302 Programming Guide
NOTICE
OVC must not be enabled in hoisting applications.
2-18 Brake Check Condition
Range:
[0] At Power Up
*
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 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 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 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 (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.
MG33MH02 - Rev. 2013-09-30
Function:
Brake check is performed at power up.
Function:
[0 - 200 %] Select overvoltage gain.