266
11. (H) Protective Function Parameters
11.12 Motor overspeeding detection
11.12
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.
*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.
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
.
Sensorless
Sensorless
Sensorless
Vector
Vector
Vector
PM
PM
PM
Pr.
Name
Initial value
Setting range
Description
374
H800
Overspeed detection
level
9999
0 to 590 Hz
If the motor rotation speed exceeds the speed set in
Pr.374
,
overspeed (E.OS) occurs, and the inverter output is shut off.
9999
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
motor frequency
.
ALM
Motor speed
Time
E.OS
Coast to stop
ON
Pr.374
Summary of Contents for FR-E800
Page 17: ...16 1 Introduction 1 3 Related manuals MEMO ...
Page 51: ...50 2 Basic Operation 2 8 I O terminal function assignment MEMO ...
Page 89: ...88 3 Parameters 3 4 Parameter list by function group number MEMO ...
Page 135: ...134 5 Speed Control 5 9 Troubleshooting in the speed control MEMO ...
Page 153: ...152 6 Torque Control 6 7 Troubleshooting in torque control MEMO ...
Page 195: ...194 8 E Environment Setting Parameters 8 18 Current average value monitor signal MEMO ...
Page 237: ...236 10 D Operation Command and Frequency Command 10 6 Operation by multi speed setting MEMO ...
Page 339: ...338 13 T Multi Function Input Terminal Parameters 13 9 Start signal operation selection MEMO ...
Page 455: ...454 16 G Control Parameters 16 13 Speed smoothing control MEMO ...