Danfoss VLT AutomationDrive FC 301 Programming Manual page 69

Parameter Descriptions
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:
100 % [0 - 200 %]
*
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 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.
Start
1=on
term.18
0=o
Par 1-71
Start delay time
Shaft speed
Output current
Pre-magnetizing
current or
DC hold current
Par 2-23
Brake delay time
on
Relay 01
o
Mechanical brake
locked
Mechanical brake
free
Illustration 3.19 Mechanical Braking
MG33ML02
Programming Guide
Function:
Select overvoltage gain.
Par 1-74
Start speed
Par 1-76 Start current/
Par 2-00 DC hold current
Reaction time EMK brake
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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.
Par 2-20
Release brake current
3
Par 2-21
Activate brake
speed
Time
67
3