105
Motor brake and stop operation
4.9.2
Selection of a regenerative brake (Pr. 30, Pr. 70)
The above parameters can be set when
Pr. 160 Extended function display selection
= "0".
(1) When using the brake resistor (MRS type), brake unit (FR-BU2), power regeneration common
converter (FR-CV), and high power factor converter (FR-HC).
Set
Pr. 30
to "0" (initial value).
The
Pr. 70
setting is made invalid.
At this time, the regenerative brake duty is as follows.
FR-D720S-025 to 100 ...................................................... 3%
FR-D740-012 or more ...................................................... 2%
Assign the inverter operation enable signal (X10) to the contact input terminal. To make protective coordination with the
FR-HC and FR-CV, use the inverter operation enable signal to shut off the inverter output.
Input the RDY signal of the FR-HC (RDYB signal of the FR-CV).
For the terminal used for X10 signal input, assign its function by setting "10" (X10) to any of
Pr. 178 to Pr. 182
.
(2) When using the high-duty brake resistor (FR-ABR) (FR-D720S-025 or more, FR-D740-012 or more)
Set
"1" in
Pr. 30
.
Set
"10%" in
Pr. 70
.
REMARKS
For the FR-D740-120 and 160, when the
Pr. 12
setting is the following, changing the
Pr. 71 Applied motor
setting automatically
changes the
Pr. 12
setting. Therefore, it is not necessary to change the
Pr. 12
setting.
(a) When 4% (initial value) is set in
Pr. 12
The
Pr. 12
setting is automatically changed to 2% if the
Pr. 71
value is changed from the value selecting the standard motor
(0, 3, 23, 40, 43) to the value selecting the constant torque motor (1, 13, 50, 53).
(b) When 2% is set in
Pr. 12
The
Pr. 12
setting is automatically changed to 4% (initial value) if the
Pr. 71
value is changed from the value selecting the
constant torque motor (1, 13, 50, 53) to the value selecting the standard motor (0, 3, 23, 40, 43).
Even if the
Pr. 12
setting is increased, braking torque is limited so that the output current is within the rated inverter current.
CAUTION
As stop holding torque is not produced, install a mechanical brake.
Parameters referred to
Pr. 13 Starting frequency
Pr. 71 Applied motor
When making frequent starts/stops, use the optional brake resistor (MRS type), high-duty brake resistor (FR-ABR)
and brake unit (FR-BU2) to increase the regenerative brake duty.
Use a power regeneration common converter (FR-CV) for continuous operation in regeneration status.
Use the high power factor converter (FR-HC) to reduce harmonics, improve the power factor, or continuously use the
regenerative status.
Parameter
Number
Name
Initial
Value
Setting
Range
Description
30
Regenerative function
selection
0
0
Without regenerative function,
Brake resistor (MRS type),
Brake unit (FR-BU2)
Power regeneration common converter (FR-CV)
High power factor converter (FR-HC)
1
High-duty brake resistor (FR-ABR)
2
High power factor converter (FR-HC) when automatic
restart after instantaneous power failure is selected
70
Special regenerative
brake duty
0%
0 to 30%
Brake duty when using the high-duty brake resistor
(FR-ABR)
Summary of Contents for FR-D700 Series
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