Selection Of A Regenerative Brake (Pr. 30, Pr. 70) - Mitsubishi Electric FR-E720-600 Instruction Manual

Motor brake and stop operation
REMARKS
For the FR-E720-240 and 330, FR-E740-120 and 170, 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 to 6, 23, 24, 40, 43, 44) to the value selecting the constant torque motor (1, 13 to 16, 50, 53, 54).
(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 to 16, 50, 53, 54) to the value selecting the standard motor (0, 3 to 6, 23, 24, 40, 43, 44).
Even if the Pr. 12 setting is increased, braking torque is limited so that the output current is within the rated inverter current.
As stop holding torque is not produced, install a mechanical brake.
Parameters referred to
Pr. 13 Starting frequency
Pr. 71 Applied motor

4.10.2 Selection of a regenerative brake (Pr. 30, Pr. 70)

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
Name
Number
Regenerative function
30
selection
Special regenerative
70
brake duty
The above parameters can be set when Pr. 160 User group read selection = "0". (Refer to page 180)
(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-E720-175 or less, FR-E740-095 or less......................3%
FR-E720-240 or more, FR-E740-120 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. 184.
(2) When using the high-duty brake resistor (FR-ABR) (FR-E720-030 or more, FR-E740-016 or more)
Set "1" in Pr. 30.
Set Pr. 70 as follows.
FR-E720-330 or less, FR-E740-170 or less ...........................10%
FR-E720-470 and 600 ............................................................6%
122
CAUTION
Refer to page 105
Refer to page 111
Initial
Value
0
0%
Setting
Range
Without regenerative function,
Brake resistor (MRS type),
0 Brake unit (FR-BU2)
Power regeneration common converter (FR-CV)
High power factor converter (FR-HC)
1 High-duty brake resistor (FR-ABR)
High power factor converter (FR-HC) when automatic
2
restart after instantaneous power failure is selected
Brake duty when using the high-duty brake resistor
0 to 30%
(FR-ABR)
Description