FANUC Series 16i/18i/21i –TB/MB
αi servo/spindle system
1.1 The αi servo/spindle motor temperature display
Because thermistor is built into the servo/the spindle motor of the αi series in
place of a past thermostat, "Motor temperature" information can be obtained
by converting the data of thermistor into temperature (°C).
The αi servo motor has two thermistors, for detecting the temperature of the
motor coil and for detecting the pulsecoder temperature. The motor overheat
alarm is generated when the temperature of the motor coil reaches 140°C or
the temperature of the PCB in the pulsecoder reaches 100°C.
The αi spindle motor has thermistor for detecting the temperature of the motor
coil. The temperature generating overheat alarm is different in each motor.
The accuracy of temperature information has an error as follows.
50? - 160°C ±5°C
160? - 180°C ±10°C
308 Servo motor temperature
[Data type] Byte-axis
[Unit of data] Degrees centigrade
[Valid data range] 0 to 255
The temperature of the αi servo motor coil is displayed. When it reaches
140°C, the motor overheat alarm is generated.
The temperature where the over heat alarm is generated has an error of