Parameter Group 2-** Brakes; Dc Brakes - Danfoss VLT AutomationDrive EZ FC 321 Programming Manual

VLT® AutomationDrive EZ FC 321
Programming Guide
•
Parameter 1-47 Torque Calibration.
•
Parameter 1-58 Flying Start Test Pulses Current.
• Parameter 1-59 Flying Start Test Pulses Frequency.
• Parameter 1-70 Start Mode.
• Parameter 30-20 High Starting Torque Time [s].
• Parameter 30-21 High Starting Torque Current [%].
Standard parameters still need configuration (for example parameter 4-19 Max Output Frequency).
Table 143: Recommendations for VVC
Application
Low inertia applications
I /I <5
Load Motor
Low inertia applications
50>I /I >5
Load Motor
High inertia applications
I /I > 50
Load Motor
High load at low speed <30% (rated
speed)
If the motor starts oscillating at a certain speed, increase parameter 1-14 Damping Gain. Increase the value in small steps. Depending
on the motor, a good value for this parameter can be 10% or 100% higher than the default value.
Adjust starting torque in parameter 1-66 Min. Current at Low Speed. 100% provides nominal torque as starting torque.
Table 144: Recommendations for Flux Applications
Application
Low inertia applications
High inertia applications
High load at low speed
Adjust starting torque in parameter 1-66 Min. Current at Low Speed. 100% provides nominal torque as starting torque.

4.3 Parameter Group 2-** Brakes

4.3.1 2-0* DC Brakes

Parameter group for configuring the DC brake and DC hold functions.
96 | Danfoss A/S © 2021.08
N O T I C E
+
Applications
Settings
Increase parameter 1-17 Voltage Filter Time Const. by factor 5–10.
Reduce parameter 1-14 Damping Gain.
Reduce parameter 1-66 Min. Current at Low Speed (<100%).
Keep calculated values.
Increase parameter 1-14 Damping Gain, parameter 1-15 Low Speed Filter Time Const.,
and parameter 1-16 High Speed Filter Time Const.
Increase parameter 1-17 Voltage filter time const. Increase parameter 1-66 Min. Current
at Low Speed (>100% for longer time can overheat the motor).
Settings
Keep calculated values.
Parameter 1-66 Min. Current at Low Speed. Increase speed to a value between default and maximum
depending on application. Set ramp times matching the application. Too fast ramp-up causes an
overcurrent/overtorque. Too fast ramp-down causes an overvoltage trip.
Parameter 1-66 Min. Current at Low Speed. Increase speed to a value between default and maximum
depending on application.
Parameter Descriptions
AU373327181955en-000101 / 130R1208