Danfoss VACON 100 FLOW Series Application Manual page 225

VACON® 100 FLOW
Application Guide
11.11.3.2 (ID 710) Stall Current
Location in the menu: P3.9.3.2
Use this parameter to set the limit above which the current of the motor must stay for a stall stage to occur.
It is possible to set the value of this parameter between 0.0 and 2*I
limit. If parameter P3.1.3.1 Motor Current Limit changes, this parameter is automatically calculated to 90% of the current limit.
The value of the Stall Current must be below the motor current limit.
A
Illustration 68: The Stall Characteristics Settings
A Stall area
11.11.3.3 (ID 711) Stall Time Limit
Location in the menu: P3.9.3.3
Use this parameter to set the maximum time for a stall stage.
This parameter is the maximum time for the stall stage to be active before a motor stall fault occurs. The value of this parameter can
be set between 1.0 s and 120.0 s. An internal counter counts the stall time. If the stall time counter value goes above this limit, the
protection causes the drive to trip.
11.11.3.4 (ID 712) Stall Frequency Limit
Location in the menu: P3.9.3.4
Use this parameter to set the limit below which the output frequency of the drive must stay for a stall stage to occur.
For a stall state to occur, the output frequency must be below this limit for a certain time.
11.11.4 Underload (Dry Pump) Protection
The motor underload protection makes sure that there is a load on the motor when the drive operates. If the motor loses the load, a
problem can occur in the process. For example, a belt can break or a pump become dry.
The motor underload protection can be adjusted with parameters P3.9.4.2 (Underload Protection: Field Weakening Area Load) and
P3.9.4.3 (Underload Protection: Zero Frequency Load). The underload curve is a squared curve between the zero frequency and the
field weakening point. The protection is not active below 5 Hz. The underload time counter does not operate below 5 Hz.
The values of the underload protection parameters are set in percentage of the nominal torque of the motor. To find the scaling
ratio for the internal torque value, use the data in the nameplate data of the motor, the motor nominal current, and the nominal
current of the drive IH. If another current than the nominal motor current is used, the precision of the calculation decreases.
If long motor cables (maximum 100 m) are used with small drives (≤1.5 kW), the motor current that the drive measures can be
much higher than the actual motor current. It is because there are capacitive currents in the motor cable.
11.11.4.1 (ID 713) Underload Fault
Location in the menu: P3.9.4.1
Danfoss A/S © 2023.08
. For a stall status to occur, the current must be higher than this
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N O T I C E
Parameter Descriptions
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