Enabling The Motor Thermistor - Mitsubishi Electric 800 Series Instruction Manual

6.3.3

Enabling the motor thermistor

When Pr.407 Motor temperature detection filter is set to a value other than "9999", the motor thermistor is enabled to
activate the motor thermal protection and slip compensation.
• Normally set about "30 s" in Pr.407.
• When the response is slow to the motor temperature, set a smaller value.
 Motor thermal
• When the motor temperature remains at 145 or higher for 10 seconds, the Motor overload trip (E.THM) is activated to shut
off the inverter output.
• When the motor temperature goes below -30 during operation, the Motor overload trip (E.THM) is activated to shut off the
inverter output. The Motor overload trip (E.THM) does not occur during a stop.
NOTE
• When operation is performed with the thermal protection function valid without a thermistor or in the calibration status,
protection function activates to shut off the inverter output.
• Since a dedicated motor with thermistor has no thermal protector, always set a value other than "9999" in Pr.407 to make
the thermal protection function valid. When the setting remains "9999", motor protection is not activated. (When Pr.407 =
"9999", the electronic thermal O/L relay operates based on the current value set in Pr.9 Electronic thermal O/L relay.)
 Slip compensation (R2 compensation)
Slip compensation (R2 compensation) is available under Vector control. Refer to
40
MOTOR THERMISTOR INTERFACE
page 47 for details.