Mitsubishi Electronics FR-A500 ユーザーズマニュアル
233
8
<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).
(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
Number
Name
Setting
Range
Minimum Setting
Increments
Factory Setting
Description
285
Excessive speed deviation
detection frequency
0 to 30Hz,
9999
0.01Hz
9999
9999: Not detected
CAUTION
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".
selected in Pr. 370 "control mode selection".
Parameter
Number
Name
Setting
Range
Minimum Setting
Increments
Factory Setting
Description
376
Wire break detection
selection
0,1
1
0
0: Function invalid
1: Function valid
1: Function valid
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.
setting "6" in Pr. 52 makes
the running speed monitor
value equivalent to the actual
speed.
Convert |(Actual speed) -
(speed command value)|
into frequency.
Preset frequency
Alarm stop occurs if speed
deviation becomes greater than
frequency set in Pr. 285.
Alarm "E.OSD" results in alarm stop.
deviation becomes greater than
frequency set in Pr. 285.
Alarm "E.OSD" results in alarm stop.
R
unn
in
g sp
e
ed (
N
ote)
Time
Actual speed
Speed command value
E.OSD activated timing
|(Actual speed) - (speed command value) | > (Pr. 285)