Danfoss VLT AutomationDrive FC 361 Programming Manual page 47

Parameter Descriptions
1-76 Start Current
Range: Function:
0 A [ 0 - par. 1-24 Some motors, for example cone
*
A] rotor motors, need extra current/
starting speed to disengage the
rotor. To obtain this boost, set the
required current in
parameter 1-76 Start Current. Set
parameter 1-74 Start Speed [RPM].
Set parameter 1-72 Start Function to
[3] Start speed cw or [4] Horizontal
operation, and set a start delay time
in parameter 1-71 Start Delay.
This parameter can be used for
hoist applications (cone rotor).
1-77 Compressor Start Max Speed [RPM]
Range: Function:
Size [ 0 - par. 4-13 Use this parameter to set the speed
related RPM] range for high starting torque.
*
Above the set speed, normal torque
and current limits are used. Setting
the parameter value to zero
disables the function.
1-78 Compressor Start Max Speed [Hz]
Range: Function:
Size [ 0 - par. 4-14 Use this parameter to set the speed
related Hz] range for high starting torque.
*
Above the set speed, normal torque
and current limits are used. Setting
the parameter value to zero
disables the function.
1-79 Compressor Start Max Time to Trip
Range: Function:
5 s [0 - 10 s] This parameter refers to the start
*
function selected in
parameter 1-72 Start Function.
Enter the time delay required
before commencing acceleration.
This parameter enables a trip if
compressor starting takes too long
time. If the speed cannot reach the
value set in
parameter 1-77 Compressor Start
Max Speed [RPM] within the
specified time, the rotor is
considered blocked and the
frequency converter trips. The time
includes any time set in
parameter 1-71 Start Delay.
MG06J202
Programming Guide
4.2.8 1-8* Stop Adjustments
1-80 Function at Stop
Option:
[0]
*
[1]
[3]
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Function:
Select the frequency converter
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].
Coast Leaves motor in free mode. The
motor is disconnected from the
frequency converter.
DC hold Energizes the motor with a DC hold
current (see parameter 2-00 DC Hold
Current).
Pre- Builds up a magnetic field while the
magnetizing 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 very first start command.
Two different solutions are available
to premagnetize the machine for
the first start command:
•
Start the frequency
converter with a 0 RPM
reference and wait 2-4
rotor time constants
before increasing the
speed reference.
•
Use the start delay with
DC hold:
•
•
•
4 4
Set
parameter 1-71 St
art Delay to the
required premag-
netizing time (2–
4 rotor time
constants). See
the time
constants
description
further in this
section).
Set
parameter 1-72 St
art Function to
either [0] DC hold
or [1] DC Brake.
Set the DC hold
or DC brake
45