Danfoss VLT AutomationDrive FC 301 Programming Manual page 81

Parameter Descriptions
4-18 Current Limit
Range: Function:
NOTICE
160.0 [1.0 -
% 1000.0 %
*
If [20] ATEX ETR is selected in
]
parameter 1-90 Motor Thermal
Protection, set parameter 4-18 Current
Limit current limit to 150%.
This is a true current limit function that
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
synchronized speed of the motor.
4-19 Max Output Frequency
Range: Function:
NOTICE
132.0 [1.0 -
Hz 1000.0
*
This parameter cannot be adjusted
Hz]
while the motor is running.
NOTICE
Maximum 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
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 0–100% (or
inverse). The signal levels corresponding
to 0% and 100% are defined in the
analog input scaling, for example
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
MG33MO02
Programming Guide
4-20 Torque Limit Factor Source
Option:
[14] Analog in X30-12
[16] Analog in X30-12
inv
4-21 Speed Limit Factor Source
Option:
[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
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]
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Function:
Function:
Select an analog input for scaling the
settings in parameter 4-19 Max Output
Frequency 0–100% (or the other way
around). The signal levels corresponding
to 0% and 100% are defined in the
analog input scaling, for example
parameter group 6-1* Analog Input 1. This
parameter is only active when
parameter 1-00 Configuration Mode is in
[4] Torque Open Loop.
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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