Mitsubishi Electric FR-A720-0.4K Instruction Manual page 208

Motor brake and stop operation
<75K or more>
Regeneration Unit
Not used
Power regeneration converter (MT-RC) R, S, T
Brake unit (MT-BU5)
High power factor converter (FR-HC)
(1) When the built-in brake resistor, the brake unit (BU, FR-BU) is used
⋅ Set "0 (initial value), 10 or 20" in Pr. 30. The Pr. 70 setting is made invalid.
At this time, the regenerative brake duty is as follows. (The built-in brake resistor is provided for the 7.5K or less.)
⋅ 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)
(2) When using the high-duty brake resistor (FR-ABR) (22K or less)
⋅ Set "1, 11 or 21" in Pr. 30.
⋅ Set Pr. 70 as follows.
7.5K or less ............................ 10%
11K or more ..............................6%
(3) 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).
(4) When using the high power factor converter (FR-HC, MT-HC) or power regeneration
common converter (FR-CV)
⋅ Set "2" in Pr. 30. The Pr. 70 setting is made invalid.
⋅ Use any of Pr. 178 to Pr. 189 (input terminal function assignment) to assign the following signals to the contact input
terminals.
(a)X10 signal: FR-HC, MT-HC connection, FR-CV connection (inverter operation enable signal)
To make protective coordination with the FR-HC, MT-HC or FR-CV, use the inverter operation enable signal
to shut off the inverter output. Input the RDY signal of the FR-HC, MT-HC (RDYB signal of the FR-CV).
(b)X11 signal: FR-HC, MT-HC connection (instantaneous power failure detection signal)
When the setting has been made to hold the mode at occurrence of an instantaneous power failure for RS-
485 communication operation, use this signal to hold the mode. Input the Y1 or Y2 signal (instantaneous
power failure detection signal) of the FR-HC, MT-HC.
⋅ For the terminal used for X10 or X11 signal input, assign its function by setting "10" (X10) or "11" (X11) in any of Pr.
178 to Pr. 189.
198
Power Supply to Pr. 30
the Inverter Setting
0
R, S, T
(initial value)
P, N 10
R, S, T / P, N 20
1
R, S, T 1
P, N 11
R, S, T / P, N 21
P, N 2
Pr. 70
Setting

0%
(initial value)
10%
