Motor Overspeeding Detection - Mitsubishi Electric FR-A820-00046 Instruction Manual

Parameters
5.10.13

Motor overspeeding detection

The Overspeed occurrence (E.OS) is activated when the motor speed exceeds the overspeed detec-
tion level. This function prevents the motor from accidentally speeding over the specified value, due
to an error in parameter setting, etc.
Pr.
374
H800
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
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.
FR-A800
Name
Overspeed detection level
Coast to stop
ON
E.OS
Initial Setting
Description
value range
If the motor rotation speed exceeds the speed set in
Pr. 374 during encoder feedback control, Real
0 to 590 Hz 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)
9999
+ 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 motor maximum frequency +
10 Hz"
Fig. 5-149:
Overspeed detection level and alarm occurrence
Time
(H) Protective function parameter
I002601E
5 - 339