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(1) When the brake unit (FR-BU2, BU, FR-BU) is used
Set "0 (initial value), 10 or 20" in Pr. 30. The Pr. 70 setting is invalid.
CAUTION
Set "1" in Pr. 0 Brake mode selection of the FR-BU2 to use GRZG type discharging resistor.
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 a brake unit (MT-BU5) and power regeneration converter (MT-RC) (01800 or
more)
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).
CAUTION
Set "2" in Pr. 0 Brake mode selection of the FR-BU2 to use MT-BR5 type resistor unit.
(3) 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.
REMARKS
When Pr. 30 = "2", "Err" is displayed on the operation panel as the inverter is reset by the setting.
(4) DC feeding mode 1 (Pr. 30 = "10, 11")
Setting "10, 11" in Pr. 30 enables DC power supply operation.
Leave the AC power supply connection terminal R/L1, S/L2, and T/L3 open and connect the DC power supply to
terminal P/+ and N/-. Also, remove jumpers across terminal R/L1 and R1/L11 as well as S/L2 and S1/L21, and
connect terminals R1/L11 and S1/L21 to terminal P/+ and N/-.
The diagram below is a connection example.
DC power
Frequency command
Frequency setting
potentiometer
R/L1
S/L2
T/L3
R1/L11
S1/L21
MC
P/+
(+)
N/-
(-)
Forward rotation start
STF
Reverse rotation start
STR
Contact input common
PC
10
3
2
2
1/2W1kΩ
5
1
Motor brake and stop operation
Inverter
Inrush
current
U
limit circuit
V
W
Earth
(Ground)
IM
103
4

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