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Motor brake and stop operation
<FR-A720-02880(FR-A740-01440) or more>
Regeneration Unit
Without regenerative function
Brake unit (FR-BU2
)
*2
Power regeneration converter (MT-RC) R/L1, S/L2, T/L3
Brake unit (MT-BU5)
High power factor converter (FR-HC)
*1
Used in combination with GZG, GRZG, or FR-BR.
*2
Used in combination with MT-BR5
(1) When the built-in brake resistor, the brake unit (FR-BU2, BU, FR-BU) is used (FR-A720-
02150 (FR-A740-01100) or less)
Set Pr. 30 = "0 (initial value), 10, or 20" for the built-in brake resistor operation, the FR-BU2 operation with GZG/
GRZG/FR-BR, or the BU/FR-BU operation. The Pr.70 setting becomes invalid.
At this time, the regenerative brake duty is as follows. (The built-in brake resistor is provided for the FR-A720-
00330(FR-A740-00170) or less.)
FR-A720-00030 to 00175.. 3%
FR-A720-00240, 00330.....2%
FR-A740-00015 to 00170..2%
Other than the above ........0% (without built-in brake resistor)
CAUTION
Do not operate the MT-BU5 type brake unit and FR-BU2 in parallel. Doing so could cause an alarm or brake unit failure. Use
the FR-BU2 only when performing parallel operation.
(2) When using the high-duty brake resistor (FR-ABR) (FR-A720-00900 (FR-A740-00440) or
less)
Set "1, 11 or 21" in Pr. 30.
Set Pr. 70 as follows.
FR-A720-00330(FR-A740-00170) or less ......10%
FR-A720-00460(FR-A740-00230) or more ....6%
(3) When the FR-BU2 brake unit is used (in combination with MT-BR5) (FR-A720-02880 (FR-
A740-01440) or higher)
Set the following parameter to use FR-BU2 with MT-BR5.
Set "1, 11, or 21" in Pr. 30.
Set "0% (initial value)" in Pr. 70.
Set Pr. 0 Brake mode selection = "2" in the brake unit FR-BU2.
REMARKS
The stall prevention (overvoltage), oL, does not occur while Pr. 30 Regenerative function selection = "1, 11, or 21"
(4) When using a brake unit (MT-BU5) and power regeneration converter (MT-RC)
Set "1, 11 or 21" in Pr. 30.
Set "10%" in Pr. 70 when using a brake unit (MT-BU5).
Set "0%" in Pr. 70 when using a power regeneration converter (MT-RC).
212
Power Supply to the
Inverter
R/L1, S/L2, T/L3
P/+, N/-
R/L1, S/L2, T/L3 - P/+, N/-
R/L1, S/L2, T/L3
P/+, N/-
R/L1, S/L2, T/L3 - P/+, N/-
R/L1, S/L2, T/L3
P/+, N/-
R/L1, S/L2, T/L3 - P/+, N/-
P/+, N/-
Pr. 30
Pr. 70
Setting
Setting
0
(initial value)
10
20
1
0%
11
(initial value)
21
0%
1
(initial value)
1
11
10%
21
2
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