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FR-A701 Series
Instruction Manual Supplement
For the FR-A701 series manufactured in September 2013 or later, the following specifications are
added. Check the serial number printed on the rating plate of the inverter. (For how to find the
SERIAL number, refer to page
.)
Brake sequence function (Pr.278 to Pr.285, Pr.292)
When the brake sequence mode 1 or 2 (Pr.292 = "17 or 18") is selected, the brake sequence remains active even if
the RT signal or X9 signal is turned ON to select the second or third function.
* When exercising vector control with the FR-A7AP/FR-A7AL (option), this parameter changes to excessive speed deviation detection frequency.
(For details, refer to the Instruction Manual.)
Parameter
Number
Name
Initial
Value
Setting
Range
Description
278
Brake opening
frequency
3Hz 0 to 30Hz
Set to the rated slip frequency of the motor + about 1.0Hz.
This parameter may be only set if Pr.278 Pr.282.
279 Brake opening current
130% 0 to 220%
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%.
280
Brake opening current
detection time
0.3s 0 to 2s Generally, set this parameter to about 0.1 to 0.3s.
281
Brake operation time at
start
0.3s 0 to 5s
Set the mechanical delay time until the brake is loosened
when Pr.292 = "7 or 17".
Set the mechanical delay time until the brake is loosened
+ about 0.1 to 0.2s when Pr.292 = "8 or 18".
282
Brake operation
frequency
6Hz 0 to 30Hz
Set the frequency to activate the mechanical brake by
turning off the brake opening request signal (BOF).
Generally, set this parameter to the Pr.278 setting + 3 to
4Hz.
Setting is enabled only when Pr.282 Pr.278.
283
Brake operation time at
stop
0.3s 0 to 5s
Set the mechanical delay time until the brake is closed +
0.1s when Pr.292 = "7 or 17".
Set the mechanical delay time until the brake is closed +
0.2 to 0.3s when Pr.292 = "8 or 18".
284
Deceleration detection
function selection
0
0 Deceleration is not detected.
1
If deceleration is not normal during deceleration operation,
the inverter fault is provided.
285
Overspeed detection
frequency*
9999
0 to 30Hz
If (detected frequency) - (output frequency) Pr.285 during
encoder feedback control, the inverter fault (E.MB1) is
provided.
9999 Overspeed is not detected.
292
Automatic acceleration/
deceleration
0
0 Normal operation mode
3
Optimum acceleration/deceleration mode (Refer to the
Instruction Manual)
5, 6 Elevator mode (Refer to the Instruction Manual)
7 Brake sequence mode 1
Disabled when the
second or third function
is selected
8 Brake sequence mode 2
11
Shortest acceleration/deceleration mode (Refer to the
Instruction Manual)
17 Brake sequence mode 1
Enabled even if the
second or third function
is selected
18 Brake sequence mode 2
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