Mitsubishi Electric FR-A720-0.4K Instruction Manual page 129

Parameter List
Parameter
Brake opening
278
frequency
Brake opening
279
current
Brake opening
280
current detection
time
Brake operation
281
time at start
Brake operation
282
frequency
Brake operation
283
time at stop
Deceleration
284
detection function
selection
Overspeed
285
detection frequency
Automatic
acceleration/
292
deceleration
Excessive speed
285
deviation detection
frequency
Speed deviation
853
time
122
Incre- Initial
Name
ments Value
0.01Hz 3Hz
0.1% 130%
0.1s 0.3s
0.1s 0.3s
0.01Hz 6Hz
0.1s 0.3s
1 0
0.01Hz 9999
1 0
0.01Hz 9999
0.1s 1s
Range Description
Set to the rated slip frequency of the motor
+ about 1.0Hz.
0 to 30Hz
This parameter may be only set if Pr. 278 ≤
Pr. 282.
Generally, set this parameter to about 50 to
90%. If the setting is too low, the load is
0 to 220% liable to drop due to gravity at start.
Suppose that the rated inverter current is
100%.
Generally, set this parameter to about 0.1
0 to 2s
to 0.3s.
Pr. 292 = 7: Set the mechanical delay time
until the brake is loosened.
0 to 5s Pr. 292 = 8: Set the mechanical delay time
until the brake is loosened + about 0.1 to
0.2s.
At this frequency, the brake opening
request signal (BOF) is switched off.
Generally, set this parameter to the Pr. 278
0 to 30Hz
setting + 3 to 4Hz.
Setting is enabled only when Pr. 282 ≥ Pr.
278.
Pr. 292 = 7: Set the mechanical delay time
until the brake is closed + 0.1s.
0 to 5s Pr. 292 = 8: Set the mechanical delay time
until the brake is closed + about 0.2 to
0.3s.
0 Deceleration is not detected.
If deceleration is not normal during
deceleration operation, the inverter fault
1 (E.MB2) is provided to trip the inverter and
turn off the brake opening request signal
(BOF).
When brake sequence function is valid
under encoder feedback control
If (detected frequency) - (output frequency)
0 to 30Hz > Pr. 285 under encoder feedback control,
the inverter fault (E.MB1) is provided to trip
the inverter and turn off the brake opening
request signal (BOF).
9999 Overspeed is not detected.
0, 1, 3, 5 to
Brake sequence function is valid when a setting is "7 or 8".
8, 11
9999 Without speed deviation excessive
0 to 30Hz
If the difference (absolute value) between
the speed command value and actual
speed exceeds the Pr. 285 Speed deviation
excess detection frequency setting for longer
than the time set in Pr. 853 Speed deviation
time during speed control under vector
0 to 100s
control, speed deviation excessive occurs
and error "E. OSD" appears, resulting in a
stop.
: enabled
× : disabled