Danfoss VACON NX, Application Manual

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Earth fault protection ensures that the sum of the motor phase currents is zero. The overcurrent protection is always working and
protects the AC drive from earth faults with high currents.
10.336 (ID 704) Motor Thermal Protection
Location in the menu:
P2.7.8
(Standard Application, Local/Remote Control Application, Multi-step Speed Control Application, PID
Control Application, Multi-purpose Control Application, Pump and Fan Control Application)
Use this parameter to select the response of the drive to 'Motor Overtemperature' fault.
Deactivating the protection, that is, setting parameter to 0, resets the thermal stage of the motor to 0%. See
10.621 Parameters of
Motor Thermal Protection (IDs 704–708) .
Motor overtemperature sensing is required when the parameter is set to 0.
10.337 (ID 705) Ambient Temperature
Location in the menu:
P2.7.9
(Standard Application, Local/Remote Control Application, Multi-step Speed Control Application, PID
Control Application, Multi-purpose Control Application, Pump and Fan Control Application
Use this parameter to set the ambient temperature where the motor is installed. The temperature value is given in Celsius or Fah-
renheit degrees.
The factor can be set between -100.0%...100.0% where
-100.0% = 0 °C
0.0% = 40 °C
100.0% = 80 °C
See 10.621 Parameters of Motor Thermal Protection (IDs 704–708) .
10.338 (ID 706) Zero Speed Cooling Factor
Location in the menu: P2.7.10 (Standard Application, Local/Remote Control Application, Multi-step Speed Control Application, PID
Control Application, Multi-purpose Control Application, Pump and Fan Control Application
Use this parameter to set the cooling factor at 0 speed in relation to the point where the motor operates at nominal speed without
external cooling.
The default value is set for conditions where there is no external fan. When using an external fan, the value can be set higher than
without the fan, for example at 90%.
When changing the parameter
Motor Nominal Current , this parameter is automatically set to its default value.
Changing this parameter does not affect the maximum output current of the drive. Only parameter P3.1.3.1 Motor Current Limit can
change the maximum output current.
Changing this parameter does not affect the maximum output current of the drive. See
10.621 Parameters of Motor Thermal Protec-
tion (IDs 704–708) .
The corner frequency for the thermal protection is 70% of the value of the parameter Motor Nominal Frequency ( ID 111 ).
AB296635287482en-000301 / DPD00903 | 251 Danfoss A/S © 2023.02
Parameter Descriptions
VACON® NX All-in-One
Application Guide