GE Industrial Solutions AF-650 GP General Purpose Drive Programming Guide - Manual (Page 133)

B-20 Release Brake Current
Range: Function:
par.
DR-37 A *
[0 - par.
DR-37 A]
Set the motor current for release of the
mechanical brake, when a start condition
is present. The default value is the
maximum current the inverter can provide
for the particular power size. The upper
limit is specified in DR-37 Drive Max.
Current.
NOTE
When Mechanical brake control
output is selected but no mechanical
brake is connected, the function will
not work by default setting due to
too low motor current.
B-21 Activate Brake Speed [RPM]
Range: Function:
0 RPM * [0 - 30000
RPM]
Set the motor speed for activation of
the mechanical brake, when a stop
condition is present. The upper speed
limit is specified in H-73 Warning Speed
High.
B-22 Activate Brake Speed [Hz]
Range: Function:
0 Hz * [0 - 5000.0 Hz] Set the motor frequency for activation of
the mechanical brake, when a stop
condition is present.
B-23 Activate Brake Delay
Range: Function:
0 s * [0 -
5 s]
Enter the brake delay time of the coast after decel
time. The shaft is held at zero speed with full
holding torque. Ensure that the mechanical brake
has locked the load before the motor enters coast
mode.
To adjust transition of the load to the mechanical
brake, set B-23 Activate Brake Delay and B-24 Stop
Delay.
Setting of brake delay parameters does not impact
the torque. The frequency converter does not
register that mechanical brake is holding the load.
B-23 Activate Brake Delay
Range: Function:
After setting B-23 Activate Brake Delay the torque
drops to zero in few minutes. The sudden torque
change leads to movement and noise.
B-24 Stop Delay
Range: Function:
0 s * [0 - 5 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.
B-25 Brake Release Time
Range: Function:
0.20 s * [0 - 5 s] This value defines the time it takes for the
mechanical brake to open/ close. This
parameter must act as a time-out when brake
feedback is activated.
B-26 Torque Ref
Range: Function:
0 % * [0 - 0 %] The value defines the torque applied against
the closed mechanical brake, before release
B-27 Torque Ramp Time
Range: Function:
0.2 s * [0 - 5 s] The value defines the duration of the torque
ramp in clockwise direction.
B-28 Gain Boost Factor
Range: Function:
1 * [0 -
4]
When a speed PID-control is connected to the
output (flux closed loop) it must be possible to
boost the proportional gain of the control during
the Activate Brake Delay (B-23 Activate Brake Delay).
By increasing the gain, the bump when the motor
takes over the load from the brake can be reduced.
The risk of oscillation is very small due to the
relatively short duration and the low (zero) speed.
Parameter Descriptions AF-650 GP Programming Guide
132 DET-618C
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