Loverspeed Detection (Pr. 374); Encoder Signal Loss Detection (Pr. 376) - Mitsubishi Electric FR-A700 Instruction Manual

Parameter
6.17.4

lOverspeed detection (Pr. 374)

Pr.
Name
No.
374
Overspeed detection level
Fig. 6-171: Overspeed detection level and alarm occurrence
The output frequency and Pr. 374 are compared during real sensorless vector control.
6.17.5

Encoder signal loss detection (Pr. 376)

When the encoder signal is lost during encoder feedback control, orientation control, or vector
control, signal loss detection (E.ECT) is activated to stop the inverter output.
Pr.
Name
No.
Encoder signal loss
376
detection enable/disable
selection
Setting can be made only when the FR-A7AP is mounted.
FR-A700 EC
Initial Setting
Description
Value Range
When the motor speed reaches or
exceeds the speed set in Pr. 374 during
encoder feedback control, real sensorless
140Hz 0–400Hz
vector control, or vector control, over
speed (E.OS) occurs and stops the inver-
ter output.
Motor speed
Pr. 374
ALM
Initial Setting
Description
Value Range
0 Signal loss detection is invalid
0
1 Signal loss detection is valid
Operation setting at alarm occurrence
Parameters referred to
Coast to stop
Time
ON
E.OS
V/F V/F V/F Magnetic flux Magnetic flux Magnetic flux
Parameters referred to
Refer to
Section
—
I001606E
Vector Vector Vector
Refer to
Section
—
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