Danfoss VLT AutomationDrive FC 301 Programming Manual page 121

VLT AutomationDrive FC 301/302
Programming Guide
Parameter 2-27 Torque Ramp Up Time
Table 175: Parameter 2-27 Torque Ramp Up Time
2-27 Torque Ramp Up Time
Default value: 0.2 s
Conversion index: -1
The value defines the duration of the torque ramp in clockwise direction. Value 0 enables very fast magnetization in flux control
principle.
Parameter 2-28 Gain Boost Factor
Table 176: Parameter 2-28 Gain Boost Factor
2-28 Gain Boost Factor
Default value: 1
Conversion index: -2
Only active in flux closed loop. The function ensures a smooth transition from torque control mode to speed control mode when
the motor takes over the load from the brake. Increase to minimize the movement. Activate the advanced mechanical braking
(parameter group 2-3* Adv. Mech Brake) by setting parameter 2-28 Gain Boost Factor to 0.
Parameter 2-29 Torque Ramp Down Time
Table 177: Parameter 2-29 Torque Ramp Down Time
2-29 Torque Ramp Down Time
Default value: 0 s
Conversion index: -1
Torque ramp-down time.
5.3.3.1 Hoist Mechanical Brake
The hoist mechanical brake control supports the following functions:
• 2 channels for mechanical braking feedback to offer further protection against unintended behavior resulting from broken ca-
ble.
• Monitoring of mechanical braking feedback throughout the complete cycle. This helps protect the mechanical brake, especially
if more drives are connected to the same shaft.
• No ramp-up until feedback confirms that mechanical brake is open.
• Improved load control at stop. If the value of parameter 2-23 Activate Brake Delay is too low, Warning 22, Hoist mech. brake is
activated and the torque is not allowed to ramp down.
•
The transition when motor takes over the load from the brake can be configured. Parameter 2-28 Gain Boost Factor can be in-
creased to minimize the movement. To achieve smooth transition, change the setting from the speed control to the position
control during the changeover.
• Set parameter 2-28 Gain Boost Factor to 0 to enable position control during parameter 2-02 DC Braking Time. This enables param-
eter 2-30 Position P Start Proportional Gain to parameter 2-33 Speed PID Start Lowpass Filter Time, which are PID parameters for the
position control.
Danfoss A/S © 2022.12
Parameter type: Range, 0 - 5 s
Data type: Uint8
Parameter type: Range, 0 - 4
Data type: Uint16
Parameter type: Range, 0 - 5 s
Data type: Uint8
Parameter Descriptions
Setup: All setups
Change during operation: True
Setup: All setups
Change during operation: True
Setup: All setups
Change during operation: True
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