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4.2.9 1-8* Stop Adjustments
Parameter 1-80 Function at Stop
Table 129: Parameter 1-80 Function at Stop
1-80 Function at Stop
Default value: [0] Coast
Parameter type: Option
Setup: All setups
Conversion index: –
Data type: Uint8
Change during operation: True
Select the drive function after a stop command or after the speed is ramped down to the settings in
parameter 1-81 Min Speed for
Function at Stop [RPM]
.
Op-
tion
Name
Description
[0]*
Coast
Leaves motor in free mode. The motor is disconnected from the drive.
[1]
DC hold
Energizes the motor with a DC hold current (see
parameter 2-00 DC Hold Current
).
[2]
Motor check
Checks if a motor has been connected. The interval for checking the motor can be defined in
parameter
4-49 Motor Check Time Interval
.
[3]
Premagne-
tizing
Builds up a magnetic field while the motor is stopped. This allows the motor to produce torque quickly
at subsequent start commands (asynchronous motors only). This premagnetizing function does not
help the 1
st
start command. Two different solutions are available to premagnetize the machine for the
1
st
start command:
Start the drive with a 0 RPM reference and wait 2–4 rotor time constants before increasing the speed
reference.
Use the start delay with DC hold:
Set
parameter 1-71 Start Delay
to the required premagnetizing time (2–4 rotor time constants). See the
time constants description further in this section. Set
parameter 1-72 Start Function
to either
[0] DC hold
or
[1] DC Brake
. Set the DC hold or DC brake current magnitude (
parameter 2-00 DC Hold Current
or
pa-
rameter 2-01 DC Brake Current
) to be equal to I_pre-mag = Unom/(1.73 x Xh).
Sample rotor time constants = (Xh+X2)/(6.3*Freq_nom*Rr)
1 kW = 0.2 s
10 kW = 0.5 s
100 kW = 1.7 s
1000 kW = 2.5 s
[4]
DC voltage
U0
When the motor is stopped,
parameter 1-55 U/f Characteristic - U [0]
defines the voltage at 0 Hz.
AU373327181955en-000101 / 130R1208
86 | Danfoss A/S © 2021.08
Parameter Descriptions
VLT® AutomationDrive EZ FC 321
Programming Guide
