Motor Overspeeding Detection - Mitsubishi Electric 800 Series Instruction Manual

5.10.12

Motor overspeeding detection

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. Name
374 Overspeed detection
H800 level

The motor maximum frequency is set in Pr.702 Maximum motor frequency. When Pr.702 = "9999 (initial value)", the Pr.84 Rated motor
frequency setting is applied as the motor maximum frequency.
Motor speed
Pr.374
ALM
E.OS
NOTE
• During encoder feedback control and vector control, the motor speed is compared against Pr.374. During Real sensorless
vector control and PM sensorless vector control, the output frequency is compared against Pr.374.
Initial Setting
value range
0 to 590 Hz
9999
9999
Coast to stop
Time
ON
(H) Protective function parameter
Description
If the motor rotation speed exceeds the speed set in Pr.374
during encoder feedback control, Real sensorless vector
control, vector control or PM sensorless vector control,
Overspeed occurrence (E.OS) occurs, the inverter output is
shut off.
If the speed exceeds "the maximum speed (Pr.1, Pr.18) + 20
Hz" during encoder feedback control, Real sensorless vector
control, or vector control, E.OS occurs.
During PM sensorless vector control, E.OS occurs when the
speed exceeds "the motor maximum frequency + 10 Hz"
PARAMETERS

5
GROUP
H
343