Motor Overspeeding Detection - Mitsubishi Electric 800 Series Instruction Manual (Function

12.12

Motor overspeeding detection

Sensorless Vector Sensorless Sensorless Vector Vector 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. Name
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.
Initial value Setting range
0 to 590 Hz
9999
9999
Coast to stop
Time
ON
E.OS
Description
If the motor rotation speed exceeds the speed set in Pr.374,
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.
During PM sensorless vector control, E.OS occurs when the speed
exceeds the speed calculated by adding 10 Hz to the maximum
*1
motor frequency .
12. (H) Protective Function Parameters
12.12 Motor overspeeding detection
11
12
13
14
15
16
17
18
19
20
305