Danfoss VLT AutomationDrive FC 302, Programming Manual, Page: 70 / 346

Application Settings
Low inertia applications Keep calculated values.
High inertia applications 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.
High load at low speed Parameter 1-66 Min. Current at Low
Speed
.
Increase speed to a value between
default and maximum depending on
application.
Table 3.12 Recommendations for Flux Applications
Adjust starting torque in parameter 1-66 Min. Current at Low
Speed . 100% provides nominal torque as starting torque.
3.3 Parameters: 2-** Brakes
3.3.1 2-0* DC brakes
Parameter group for configuring the DC brake and DC hold
functions.
2-00 DC Hold Current
Range: Function:
50
%
*
[ 0 -
160 %]
NOTICE
The maximum value depends on the rated
motor current.
Avoid 100% current for too long. It may
damage the motor.
Low values of DC hold produce larger than
expected currents with larger motor power
sizes. This error increases as the motor
power increases.
Enter a value for holding current as a percentage
of the rated motor current I
M,N
set in
parameter 1-24 Motor Current . 100% DC hold
current corresponds to I
M,N
.
This parameter holds the motor function (holding
torque) or preheats the motor.
This parameter is active if
DC hold is selected in
parameter 1-72 Start Function [0] or
parameter 1-80 Function at Stop [1] .
2-01 DC Brake Current
Range: Function:
50
%
*
[ 0 -
1000 %
]
NOTICE
The maximum value depends on the rated
motor current.
Avoid 100% current for too long. It may
damage the motor.
Enter a value for current as a percentage of the
rated motor current I
M,N
, see parameter 1-24 Motor
Current . 100% DC brake current corresponds to
I
M,N
.
DC brake current is applied on a stop command,
when the speed is lower than the limit set in
parameter 2-03 DC Brake Cut In Speed [RPM] ; when
the DC Brake Inverse function is active, or via the
serial communication port. The braking current is
active during the time period set in
parameter 2-02 DC Braking Time .
2-02 DC Braking Time
Range: Function:
10 s
*
[0 - 60 s] Set the duration of the DC brake current set in
parameter 2-01 DC Brake Current , once
activated.
2-03 DC Brake Cut In Speed [RPM]
Range: Function:
Size related
*
[ 0 - par.
4-13 RPM] Set the DC brake cut-in speed for
activation of the DC brake current
set in
parameter 2-01 DC Brake
Current , upon a stop command.
2-04 DC Brake Cut In Speed [Hz]
Range: Function:
Size
related
*
[ 0 - par.
4-14 Hz]
NOTICE
Parameter 2-04 DC Brake Cut In
Speed [Hz]
is not effective when
parameter 1-10 Motor Construction
= [1] PM, non-salient SPM .
Set the DC brake cut-in speed for
activation of the DC brake current set in
parameter 2-01 DC Brake Current after a
stop command.
2-05 Maximum Reference
Range: Function:
Size
related
*
[ par. 3-02 -
999999.999
ReferenceFeed-
backUnit] This is an access parameter to
parameter 3-03 Maximum Reference
for legacy products. The maximum
reference is the highest value
obtainable by summing all
references. The maximum reference
Parameter Descriptions
VLT
®
AutomationDrive FC 301/302
68 Danfoss A/S © 10/2018 All rights reserved. MG33MP02
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