Motor Overspeeding Detection - Mitsubishi Electric FR-A800 Series Instruction Manual

NOTE
• When the load reference is not set for five points, the load characteristics value is determined by linear interpolation of the set
load reference values only. If there is only one load reference setting, the set load reference is used as the load reference all
through the range.
Parameters referred to
Pr.41 Up-to-frequency
Pr.190 to Pr.196 (Output terminal function

5.10.13 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.
374
H800
*1 The motor maximum frequency is set in Pr.702 Maximum motor frequency. When Pr.702 = "9999 (initial value)", the 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.
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Load(%)
120
100
80
60
40
26
20
0
0 10
sensitivitypage 484
selection)page 473
Name Initial value
Overspeed detection
9999
level
Coast to stop
ON
E.OS
search engine
20 30 40 50
Setting range
If the motor rotation speed exceeds the speed set in Pr.374 during
encoder feedback control, Real sensorless vector control, Vector
0 to 590 Hz
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.
9999
During PM sensorless vector control, E.OS occurs when the speed
exceeds the "maximum motor frequency + 10 Hz"
Time
60 70 Frequency(Hz)
Description
5.10 (H) Protective function parameter
1
2
3
4
5
6
7
8
9
10
*1
.
443
5. PARAMETERS