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Mitsubishi Electric FR-A500 Instruction Manual Page 238

Transistorized inverter.
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<When used with the FR-A5AP option>
(1) Addition of Pr. 285 "excessive speed deviation detection frequency"
In case the motor speed is increased or decreased due to load, etc. during vector control and can not be
controlled to meet the speed command value, alarm stop occurs (E. OSD).
Parameter
Name
Number
Excessive speed deviation
285
detection frequency
Speed command value
Actual speed
Pr. 285 shares the function with Pr. 285 "overspeed detection frequency" of the
inverter's brake sequence function. This function is made valid when vector control is
selected in Pr. 370 "control mode selection".
(2) Addition of Pr. 376 "wire break detection selection"
Alarm stop (E.ECT) occurs if the encoder signal's interruption is detected during orientation, encoder
feedback or vector control.
Parameter
Name
Number
Wire break detection
376
selection
Setting
Range
0 to 30Hz,
9999
|(Actual speed) - (speed command value) | > (Pr. 285)
Preset frequency
Alarm stop occurs if speed
deviation becomes greater than
frequency set in Pr. 285.
Alarm "E.OSD" results in alarm stop.
CAUTION
Setting
Range
0,1
229
Minimum Setting
Factory Setting
Increments
0.01Hz
9999
E.OSD activated timing
Note: When an encoder is connected,
setting "6" in Pr. 52 makes
the running speed monitor
value equivalent to the actual
speed.
Convert |(Actual speed) -
(speed command value)|
into frequency.
Time
Minimum Setting
Factory Setting
Increments
1
0
OPTIONS
Description
9999: Not detected
Description
0: Function invalid
1: Function valid
8

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    good manual and it is very good to understand the contant of inverter and i lernt many things in this manual