Motor Overspeeding Detection - Mitsubishi Electric FR-E800 Series Instruction Manual

11.12

Motor overspeeding detection

Sensorless Sensorless Vector Sensorless Vector Vector
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
NOTE
• During the encoder feedback control operation or under Vector control, the motor speed is compared against Pr.374. Under
Real sensorless vector control or PM sensorless vector control, the output frequency is compared against Pr.374.
266
11. (H) Protective Function Parameters
11.12 Motor overspeeding detection
PM PM PM
Name Initial value
9999
Coast to stop
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 encoder feedback control,
Real sensorless vector control, or 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
Time
Description
*1
.