Mitsubishi Electric FR-A720-0.4K Instruction Manual page 219

Motor brake and stop operation
<75K or higher>
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
⋅ 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 7.5K or lower.)
⋅ 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)
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) (22K or lower)
⋅ Set "1, 11 or 21" in Pr. 30.
⋅ Set Pr. 70 as follows.
7.5K or lower.......................... 10%
11K or higher ........................... 6%
(3) When the FR-BU2 brake unit is used (in combination with MT-BR5) (75K 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).
208
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