Mitsubishi FR-A500 Series Instruction Manual page 230

<When using 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, PLG feedback or
vector control.
Parameter
Name
Number
Wire break detection
376
selection
Setting Minimum 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 Minimum Setting
Range
0,1
214
Factory Setting
Increments
0.01Hz 9999
E.OSD activated timing
Note: When a PLG 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
Factory Setting
Increments
1 0
OPTIONS
Description
9999: Not detected
Description
0: Function invalid
1: Function valid
7