Mitsubishi Electric FR-A800 Series Instruction Manual page 137

 Command speed and actual operation check
Check for a gap between the actual speed and commanded speed by comparing the inverter's speed command and the speed
detected by the speed detector.
System failure
136
3. PRECAUTIONS FOR USE OF THE INVERTER
3.7 Failsafe system which uses the inverter
Downloaded from ManualsNet.com
Controller
Inverter
To the alarm detection sensor
search engine
Sensor
(speed, temperature,
air volume, etc.)