Selection Of Regenerative Brake And Dc Feeding (Pr. 30, Pr. 70) - Mitsubishi Electric FR-A720-0.4K Instruction Manual

4.14.2 Selection of regenerative brake and DC feeding (Pr. 30, Pr. 70)

When making frequent starts/stops, use the optional high-duty brake resistor (FR-ABR), brake unit (BU, FR-BU,
MT-BU) to increase the regenerative brake duty.
Use a power regeneration common converter (FR-CV) or power regeneration converter (MT-RC) for continuous
operation in regenerative status.
Use the "high power factor converter (FR-HC, MT-HC) to reduce harmonics, improve the power factor, or
continuously use the regenerative mode.
You can select either DC feeding mode 1 in which operation is performed with DC power (terminal P, N) or DC
feeding mode 2 in which operation is performed normally with the AC power (terminal R, S, T) and performed
with DC power such as battery at occurrence of power failure.
Parameter
Name
Number
Regenerative function
30
selection
Special regenerative
70
brake duty
<55K or less>
Regeneration Unit
Built-in brake (7.5K or less),
brake unit (FR-BU, BU)
High-duty brake resistor (FR-ABR)
(22K or less)
High power factor converter (FR-HC),
Power regeneration common
converter (FR-CV)
Initial
Setting Range
Value
0
10
20
1
0
11
21
2
55K or less 0 to 30%
0%
75K or more 0 to 10%
Power Supply Pr. 30
to the Inverter Setting
0
R, S, T
(initial value)
P, N 10
R, S, T / P, N 20
R, S, T 1
P, N 11
R, S, T / P, N 21
P, N 2
Motor brake and stop operation
Description
Regeneration unit
Built-in brake resistor, without
regenerative function, brake unit
(FR-BU, BU type)
High-duty brake resistor, Brake
unit (MT-BU5), Power
regeneration converter (MT-RC)
High power factor converter (FR-
HC, MT-HC), power
regeneration common converter
(FR-CV)
Set the %ED of the built-in brake transistor operation.
Pr. 70
Setting
The regenerative brake duty is as follows.
⋅ FR-A720-0.4K to 3.7K . . . . . 3%
⋅ FR-A720-5.5K, 7.5K . . . . . . . 2%

⋅ FR-A740-0.4K to 7.5K . . . . . 2%
⋅ Other than the above . . . . . . 0%
(without built-in brake resistor)
Change the setting according to the capacity.
10/6%
(7.5K or less / 11K or more)
0
(initial value)
Terminal for power
supply to the inverter
R, S, T
P, N
(DC feeding mode 1)
R, S, T / P, N
(DC feeding mode 2)
R, S, T
P, N
(DC feeding mode 1)
R, S, T / P, N
(DC feeding mode 2)
P, N
Remarks
197
Pr. 29
page 171
Pr.31
page 154
Pr. 69
page 260
Pr.71
page 179
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