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Motor brake and stop operation
4
PARAMETERS
4.14.2 Selection of regenerative brake and DC feeding (Pr. 30, Pr. 70)
*1 Used in combination with GZG, GRZG, or FR-BR.
*2 Used in combination with MT-BR5
<55K or lower>
When making frequent starts/stops, use the optional high-duty brake resistor (FR-ABR), brake unit (FR-BU2,
BU, FR-BU, MT-BU5) 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 a 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/L1, S/L2, T/L3) and
performed with DC power such as battery at occurrence of power failure.
Parameter
Number
Name
Initial
Value
Setting Range Description
30
Regenerative function
selection
0
Regeneration unit
Terminal for power
supply to the inverter
0
Built-in brake resistor, inverter
without regenerative function,
brake unit (FR-BU2
*1, FR-BU,
BU type)
R/L1, S/L2, T/L3
10
P/+, N/-
(DC feeding mode 1)
20
R/L1, S/L2, T/L3 - P/+, N/-
(DC feeding mode 2)
1
High-duty brake resistor, brake
unit (FR-BU2
*2, MT-BU5),
power regeneration converter
(MT-RC)
R/L1, S/L2, T/L3
11
P/+, N/-
(DC feeding mode 1)
21
R/L1, S/L2, T/L3 - P/+, N/-
(DC feeding mode 2)
2
High power factor converter
(FR-HC, MT-HC), power
regeneration common
converter (FR-CV)
P/+, N/-
70
Special regenerative
brake duty
0%
55K or
lower
0 to 30%
Set the %ED of the built-in brake transistor operation.
75K or
higher
0 to 10%
Regeneration Unit
Power Supply to
the Inverter
Pr. 30
Setting
Pr. 70
Setting
Remarks
Built-in brake (7.5K or lower)
,
brake unit (FR-BU2
*1, FR-BU, BU)
R/L1, S/L2, T/L3
0
(initial value)
⎯
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)
P/+, N/- 10
R/L1, S/L2, T/L3 -
P/+, N/-
20
High-duty brake resistor (FR-ABR)
(22K or lower)
R/L1, S/L2, T/L3 1
10/6%
Change the setting according to the
capacity.
(7.5K or lower / 11K or higher)
P/+, N/- 11
R/L1, S/L2, T/L3 -
P/+, N/-
21
High power factor converter (FR-HC),
power regeneration common
converter (FR-CV)
P/+, N/- 2
0
(initial value)
⎯