Motor Overspeeding Detection - Mitsubishi Electric 800 Series Instruction Manual

10.12

Motor overspeeding detection

Sensorless Sensorless Sensorless PM PM PM
The Overspeed occurrence (E.OS) is activated when the motor speed exceeds the overspeed detection level. This function
prevents the motor from accidentally speeding over the specified value, due to an error in parameter setting, etc.
Pr.
374 Overspeed detection
H800 level
*1 The motor maximum frequency is set in Pr.702 Maximum motor frequency. When Pr.702 = "9999" (initial value), the value set in Pr.84 Rated
motor frequency is used as the maximum motor frequency.
Motor speed
Pr.374
ALM
232
10.(H) Protective Function Parameters
10.12 Motor overspeeding detection
Name Initial value
9999
Coast to stop
Time
ON
E.OS
Setting range
If the motor rotation speed exceeds the speed set in Pr.374,
0 to 590 Hz
overspeed (E.OS) occurs, and the inverter output is shut off.
If the speed exceeds the speed calculated by adding 20 Hz to the
maximum frequency (Pr.1, Pr.18) during Real sensorless vector
control, E.OS occurs.
9999
During PM sensorless vector control, E.OS occurs when the speed
exceeds the speed calculated by adding 10 Hz to the maximum
motor frequency
Description
*1
.