Danfoss VACON 100 FLOW Series Application Manual page 221

VACON® 100 FLOW
Application Guide
11.11.1.13 (ID 775) Response to Safe Torque Off (STO) Fault
Location in the menu: P3.9.1.14
Use this parameter to select the response of the drive to a 'STO Fault'.
This parameter defines drive operation when Safe Torque Off (STO) function is activated (for example, emergency stop button has
been pressed or some other STO operation has been activated). See P3.9.1.2.
11.11.1.14 (ID 751) Fieldbus Communication Fault Force Delay
Location in the menu: P3.9.1.17
Use this parameter to set a delay for temporarily forcing the fault-response for fieldbus timeout from 'No Action', 'Alarm' or 'Alarm
Preset Frequency' to 'Fault'. When a timeout occurs, the drive responds as selected with P3.9.1.6 and keeps running. After the delay
time set by this parameter, the drive goes to a fault-state and the stop running.
If this parameter is set to 0.00 s, the fault-type remains as it is set with P3.9.1.6 and the drive runs indefinitely. If the fault-type is Fault
or Fault-Coast, this delay does no affect anything.
11.11.1.15 (ID 752) Fieldbus Communication Fault Clear Delay
Location in the menu: P3.9.1.18
Use this parameter to set a delay for accepting new fieldbus start, reverse, and refence commands after a timeout has been cleared.
The delay starts running after the connection has been re-established, and not after clearing a fieldbus timeout fault.
11.11.1.16 (ID 753) Unbalance Current Alarm
Location in the menu: P3.9.1.19
Use this parameter to set the response of the drive to an Unbalance Current Alarm. Available options are 'No Action' and 'Alarm'.
This option is only available for MR11 and MR12 enclosure sizes.
11.11.2 Motor Thermal Protections
The motor thermal protection prevents the motor from becoming too hot.
The AC drive can supply a current that is higher than the nominal current. The high current can be necessary to the load, and it must
be used. In these conditions, there is a risk of a thermal overload. Low frequencies have a higher risk. At low frequencies, the cooling
effect and the capacity of the motor decrease. If the motor has an external fan, the load reduction at low frequencies is small.
The motor thermal protection is based on calculations. The protection function uses the output current of the drive to know what is
the load on the motor. If the control board is not energized, the calculations are reset.
To adjust the thermal protection of the motor, use the parameters from P3.9.2.1 to P3.9.2.5. It is possible to monitor the thermal
status of the motor on the display of the control panel.
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.
OVERHEATING BECAUSE OF BLOCKED AIRFLOW
If the airflow to the motor is blocked, the function does not protect the motor, and the motor can become too hot. It can damage
the motor.
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Make sure that the airflow to the motor is not blocked.
11.11.2.1 (ID 704) Motor Thermal Protection
Location in the menu: P3.9.2.1
Use this parameter to select the response of the drive to a 'Motor Overtemperature' fault. If the motor thermal protection function
detects that the temperature of the motor is too high, a motor overtemperature fault occurs.
If possible, use a motor thermistor to protect the motor. Set the value of this parameter to 0.
11.11.2.2 (ID 705) Ambient Temperature
Location in the menu: P3.9.2.2
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Parameter Descriptions
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