Mitsubishi Electric FR-A700 Instruction Manual page 222

Parameter overview
Parameter
Func-
Name
tion
Brake opening fre-
278
quency
279 Brake opening current
Brake opening current
280
detection time
Brake operation time at
281
start
Brake operation fre-
282
quency
Brake operation time at
283
stop
Deceleration detection
284
function selection
Excessive speed devia-
285 tion detection fre-
quency
Automatic accelera-
292
tion/deceleration
Speed deviation excess
285
detection frequency
Speed deviation time
853
Tab. 6-1: Parameter overview (42)
6 - 42
Incre- Initial Setting
ments Value Range
0.01Hz 3Hz 0–30Hz
0.1% 130% 0–220%
0.1s 0.3s 0–2s
0.1s 0.3s 0–5s
0.01Hz 6Hz 0–30Hz
0.1s 0.3s 0–5s
0
1 0
1
0.01Hz 9999 0–30Hz
0/1/3/
1 0
5–8/11
9999
0.01Hz 9999
0–30Hz
0.1s 1s 0–100s
Description
Set to the rated slip frequency of
the motor + about 1.0Hz. 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 liable to drop
due to gravity at start. Suppose that
the rated inverter current is 100%.
Generally, set this parameter to
about 0.1 to 0.3s.
Pr. 292 = 7: Set the mechanical
delay time until the brake is loos-
ened.
Pr. 292 = 8: Set the mechanical
delay time until the brake is loos-
ened + about 0.1 to 0.2s.
At this frequency, the brake open-
ing request signal (BOF) is
switched off. Generally, set this
parameter to the Pr. 278 setting +
3 to 4Hz.
Setting is enabled only when
Pr. 278 ≤ Pr. 282.
Pr. 292 = 7: Set the mechanical
delay time until the brake is closed
+ 0.1s.
Pr. 292 = 8: Set the mechanical
delay time until the brake is closed
+ about 0.2 to 0.3s.
Deceleration is not detected.
If deceleration is not normal dur-
ing deceleration operation, the
inverter alarm (E.MB2) is provided
to shut off the output and turn off
the brake opening request signal
(BOF).
When brake sequence function is
made valid under encoder feed-
back control If (detected fre-
quency) − (output frequency) >
Pr 285 under encoder feedback
control, the inverter alarm (E.MB1)
is provided to shut off the output
and turn off the brake opening
request signal (BOF).
Overspeed is not detected.
Brake sequence function is made valid when a setting is "7 or 8".
Without speed deviation excessive
If the difference (absolute value)
between the speed command
value and actual speed exceeds
the Pr. 285 "Speed deviation
excess detection frequency" set-
ting for longer than the time set in
Pr. 853 "Speed deviation time" dur-
ing speed control under vector
control, speed deviation excessive
occurs and error "E. OSD" appears,
resulting in a stop.
Parameter
All
Para- Para-
para-
meter meter
meter
copy clear
Refer
clear
to
page
✔: enabled
—: disabled
✔ ✔ ✔
✔ ✔ ✔
✔ ✔ ✔
✔ ✔ ✔
✔ ✔ ✔
6-261
✔ ✔ ✔
✔ ✔ ✔
✔ ✔ ✔
✔ ✔ ✔
6-107
✔ ✔ ✔