Mitsubishi Electric 800 Series Instruction Manual page 271

5.7.14 Motor overspeeding detection
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 level
H800
*1 The maximum motor 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 maximum motor frequency.
Motor speed
Pr.374
ALM
270
5. PARAMETERS
5.7 (H) Protective function parameter
Name Initial value
9999
Coast to stop
Time
ON
E.OS
Setting
range
0 to 590 Hz If the motor rotation speed exceeds the speed set in Pr.374
during PM motor control, Overspeed occurrence (E.OS)
occurs, and the inverter output is shut off.
9999 During PM motor control, E.OS occurs when the speed
exceeds the "maximum motor frequency + 10 Hz".
Description
*1