Mitsubishi FR-A721-11K Instruction Manual page 134

Parameter
Name
Stop-on contact/load torque
270
high-speed frequency
control selection
Stop-on contact excitation
275
current low-speed
multiplying factor
PWM carrier frequency at
276
stop-on contact
278
Brake opening frequency
279
Brake opening current
Brake opening current
280
detection time
Brake operation time at
281
start
282
Brake operation frequency
Brake operation time at
283
stop
Deceleration detection
284
function selection
Overspeed detection
285
frequency
Automatic acceleration/
292
deceleration
Excessive speed deviation
285
detection frequency
Speed deviation time
853
Incre Initial
Range
ments Value
Without stop-on contact control and load torque high-
0
speed frequency control
1 Stop-on contact control
1 0
2 Load torque high speed frequency control
Stop-on contact + load torque high speed frequency
3
control
Usually set a value between 130% and 180%.
0 to 1000% Set the force (holding torque) for stop-on-contact
0.1% 9999
control.
9999 No compensation.
Set a PWM carrier frequency for stop-on-contact
0 to 9 control.
1 9999
(Valid at the output frequency of 3Hz or less.)
9999 As set in Pr. 72 PWM frequency selection.
Set to the rated slip frequency of the motor + about
1.0Hz.
0.01Hz 3Hz 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 liable to drop due to
0.1% 130% 0 to 220%
gravity at start.
Suppose that the rated inverter current is 100%.
0.1s 0.3s 0 to 2s Generally, set this parameter to about 0.1 to 0.3s.
Pr. 292 = 7: Set the mechanical delay time until the
brake is loosened.
0.1s 0.3s 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
0.01Hz 6Hz 0 to 30Hz
to the Pr. 278 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.
0.1s 0.3s 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
1 0
operation, the inverter fault (E.MB2) is provided to
1
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) > Pr. 285
0 to 30Hz
under encoder feedback control, the inverter fault
0.01Hz 9999
(E.MB1) is provided to trip the inverter and turn OFF
the brake opening request signal (BOF).
9999 Overspeed is not detected.
0, 3, 5 to 8,
Brake sequence function is valid when a setting is "7
1 0
or 8".
11
9999 Without speed deviation excessive
0.01Hz 9999
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
0.1s 1s 0 to 100s
time during speed control under vector control, speed
deviation excessive occurs and error "E. OSD"
appears, resulting in a stop.
Parameter List
Description
127
4