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Motor brake and stop operation
4.9.2 Selection of a regenerative brake and DC feeding (Pr. 30, Pr. 70)
The above parameters can be set when Pr. 160 User group read selection = "0". (Refer to page 190)
....Specifications differ according to the date assembled. Refer to page 400 to check the SERIAL number.
<FR-F720-02330 (FR-F740-01160) or less>
<FR-F720-03160 (FR-F740-01800) or more>
When making frequent starts/stops, use the optional brake unit (FR-BU2, 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 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 DC feeding mode 1, which operates with DC power supply (terminal P/+, N/-), or DC feeding
mode 2, which normally operates with AC power supply (terminal R/L1, S/L2, T/L3) and with DC power supply
such as battery at power failure occurrence.
Parameter
Number
Name
Initial
Value
Setting
Range
Description
30
Regenerative
function
selection
0
Regeneration unit
Terminal for power
supply to the inverter
Reset at main circuit
power supply ON
0
Inverter without regenerative
function, brake unit (FR-BU2,
FR-BU, BU type)
R/L1, S/L2, T/L3
Reset
100 Not reset
10
P/+, N/-
(DC feeding mode 1)
-
20
R/L1, S/L2, T/L3 - P/+, N/-
(DC feeding mode 2)
Reset
120 Not reset
1
Brake unit (MT-BU5), power
regeneration converter (MT-
RC)
R/L1, S/L2, T/L3
Reset
101 Not reset
11
P/+, N/-
(DC feeding mode 1)
-
21
R/L1, S/L2, T/L3 - P/+, N/-
(DC feeding mode 2)
Reset
121 Not reset
2
High power factor converter
(FR-HC, MT-HC), power
regeneration common
converter (FR-CV)
P/+, N/- -
70
Special
regenerative
brake duty
0% 0 to 10%
Set the %ED of the brake transistor operation when using a brake unit (MT-BU5).
(Setting is available only for the FR-F720-03160 (FR-F740-01800) or more)
Regeneration Unit
Power Supply to
the Inverter
Pr. 30 Setting
Inverter without regenerative function
,
brake unit (FR-BU2
, FR-BU, BU)
R/L1, S/L2, T/L3 0
(initial value), 100
P/+, N/- 10
R/L1, S/L2, T/L3 -
P/+, N/-
20, 120
High power factor converter (FR-HC),
power regeneration common
converter (FR-CV)
P/+, N/- 2
Regeneration Unit
Power Supply to the
Inverter
Pr. 30 Setting Pr. 70 Setting
Brake unit (FR-BU2)
R/L1, S/L2, T/L3 0
(initial value), 100
⎯P/+, N/- 10
R/L1, S/L2, T/L3 - P/+, N/- 20, 120
Power regeneration converter (MT-RC) R/L1, S/L2, T/L3 1, 101 0%
(initial value)
Brake unit (MT-BU5)
R/L1, S/L2, T/L3 1, 101
10%P/+, N/- 11
R/L1, S/L2, T/L3 - P/+, N/- 21, 121
High power factor converter (MT-HC) P/+, N/- 2 ⎯