Danfoss VLT AutomationDrive FC 302 Programming Manual page 79

Parameter Descriptions
4-18 Current Limit
Range: Function:
Size [ 1.0 - This is a true current limit function that
related 1000.0 %] continues in the oversynchronous range.
*
However, due to field weakening the
motor torque at current limit will drop
accordingly when the voltage increase
stops above the synchronised speed of
the motor.
4-19 Max Output Frequency
Range: Function:
NOTICE
Size [ 1 -
related 590
*
This parameter cannot be adjusted
Hz]
while the motor is running.
NOTICE
Max. output frequency cannot exceed
10% of the inverter switching frequency
(parameter 14-01 Switching Frequency).
Provides a final limit on the output frequency
for improved safety in applications where
accidental overspeeding is to be avoided. This
limit is final in all configurations (independent
of the setting in parameter 1-00 Configuration
Mode).
4-20 Torque Limit Factor Source
Option: Function:
Select an analog input for scaling the
settings in parameter 4-16 Torque Limit
Motor Mode and parameter 4-17 Torque
Limit Generator Mode from 0% to 100%
(or inverse). The signal levels
corresponding to 0% and 100% are
defined in the analog input scaling, e.g.
parameter group 6-1* Analog Input 1.
This parameter is only active when
parameter 1-00 Configuration Mode is in
Speed Open Loop or Speed Closed Loop.
[0] No function
*
[2] Analog in 53
[4] Analog in 53 inv
[6] Analog in 54
[8] Analog in 54 inv
[10] Analog in
X30-11
[12] Analog in
X30-11 inv
[14] Analog in
X30-12
[16] Analog in
X30-12 inv
MG33MJ02
Programming Guide
4-21 Speed Limit Factor SourceOption
Option:
[0] No function
*
[2] Analog input 53
[4] Analog input 53
inv
[6] Analog input 54
[8] Analog input 54
inv
[10] Analog input
X30-11
[12] Analog input
X30-11 inv
[14] Analog input
X30-12
[16] Analog input
X30-12 inv
4-23 Brake Check Limit Factor Source
Select the input source for the function in parameter 2-15 Brake
Check. If several frequency converters are carrying out a brake
check simultaneously, the resistance in the grid leads to a
voltage drop on the mains or DC-link and a false brake check
can occur. Use an external current sensor on every brake resistor.
If an application requires a 100% valid brake check, connect the
sensor to an analog input.
Option:
[0]
*
[1]
[2]
Danfoss A/S © Rev. 10/2014 All rights reserved.
Function:
Select an analog input for scaling the
settings in parameter 4-19 Max Output
Frequency from 0% to 100% (or vice
versa). The signal levels corresponding
to 0% and 100% are defined in the
analog input scaling, e.g. parameter
group 6-1* Analog Input 1. This
parameter is only active when
parameter 1-00 Configuration Mode is in
Torque Mode.
Function:
DC-link voltage The frequency converter
performs the brake check by
monitoring the DC-link
voltage. The frequency
converter injects current in
the brake resistor which
lowers the DC-link voltage.
Analog Input 53 Select to use an external
current sensor for brake
monitoring.
Analog Input 54 Select to use an external
current sensor for brake
monitoring.
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