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6 Basic Parameter Settings
High-function General-purpose Inverter RX2 Series User’s Manual
6-6 Thermal Protection of Motor (Electronic Thermal)
6
6-6-1 Electronic Thermal Setting
Parameter
Optimal protection characteristics can be achieved with the deterioration of the cooling ability of the
motor at a low speed taken account of. ([bC111]=00)
Frequency-dependent characteristics can be set in the selection of the electronic thermal characteris-
tics. ([bC111]=02)
Precautions for Correct Use
• Autocooling motor needs to be used with reduced load (current) since the cooling function of
the autocooling fan becomes less effective when the motor rotation frequency decreases.
• The reduced torque characteristics are in accordance with the heat generation of the auto-
cooling motor.
Parameter
Item
Parameters
Data Description
Default
data
First electronic thermal
level
[bC110]
In range of 20 to 300%
of the inverter rated
current (unit: A)
*1
*1. The inverter rated current is switched by the load type selection [Ub-03]. Even if [bC110] is set to be high,
[E001] excessive current error occurs when the current exceeds the excess current level.
Sets the protection current of motor.
1.00 ×
Inverter
rated
current
Electronic thermal
characteristic
selection, 1st-motor
[bC111]
00
Reduced torque characteristics:
Pattern for cooling function deteriora-
tion at a low speed
01
*2
*2. Default data when default data selection (UB-02) is set to 01.
01
Constant torque characteristics:
Pattern for constant output
02
Free setting:
Multiple patterns are available
according to the motor characteris-
tics.
Change of Electronic Thermal Characteristics
Item
Parameters
Data Description
Default
data
Electronic thermal
characteristic
selection, 1st-motor
[bC111]
00
Reduced torque characteristics:
Pattern for cooling function deterioration at a
low speed
01
*1
*1. Default data when default data selection (UB-02) is set to 01.
01
Constant torque characteristics:
Pattern for constant output
02
Free setting:
Multiple patterns are available according to the
motor characteristics.
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