Danfoss VLT AutomationDrive FC 300 Operating Instructions Manual page 76

How to Programme the Low Ha...
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 over-current or over-voltage situation, the
mechanical brake immediately cuts in. This is also the case
during safe stop.
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 6.8
2-20 Release Brake Current
Range:
par. 16-37 A [0.00 - par. 16-37 A]
*
2-21 Activate Brake Speed [RPM]
Range: Function:
0 RPM [0 - 30000 Set the motor speed for activation of
*
RPM] the mechanical brake, when a stop
condition is present. The upper speed
limit is specified in 4-53 Warning Speed
High.
2-22 Activate Brake Speed [Hz]
Range:
0 Hz [0.0 - 5000.0 Hz]
*
2-23 Activate Brake Delay
Range: Function:
0.0 s [0.0 - Enter the brake delay time of the coast after
*
5.0 s] ramp-down time. The shaft is held at zero
speed with full holding torque. Ensure that the
VLT Automation Low Harmonic Drive Operating Instructions
Par 1-74
Start speed
Par 1-76 Start current/
Par 2-00 DC hold current
Reaction time EMK brake
Function:
Function:
®
MG34O202 - VLT is a registered Danfoss trademark
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.
Par 2-20
Release brake current
2-23 Activate Brake Delay
Range: Function:
mechanical brake has locked the load before
the motor enters coast mode. See Mechanical
Brake Control in the FC 300 Design Guide,
MG33BXYY.
2-24 Stop Delay
Range: Function:
0.0 s [0.0 - 5.0 s] Set the time interval from the moment
*
when the motor is stopped until the brake
closes. This parameter is a part of the
stopping function.
2-25 Brake Release Time
Range: Function:
0.20 s [0.00 - 5.00 This value defines the time it takes for
*
s] the mechanical brake to open. This
parameter must act as a time-out when
brake feedback is activated.
6
Par 2-21
Activate brake
speed
Time
75
6