Mitsubishi Electric FR-A700 Series, Technical Manual

Page: 43 / 550

36
SPECIFICATIONS
1.4.2 Connecting external power supply to the control circuit (R1/L11, S1/L21)
(A700)(F700)
If any of the protective functions (other than fan alarm, stall
prevention, and current limit functions) are activated, the alarm
indicator lamp is lit and the corresponding fault signal is output.
If the MC etc. in the inverter power supply is switched OFF by
the fault signal at this time, the control power is lost and the
fault output cannot be kept ON. To keep this fault output ON,
use the other power supply with the control circuit (power
supply with the same voltage as the one used with the main
circuit).
Connection
Never connect the power cable to the terminals in the wrong
stand. Doing so will damage the inverter. The other power
supply connection terminal block on the printed circuit board is
a two-step type terminal block and jumpers are connected
across the upper and lower terminals before shipment from the
factory. After loosening (and removing) the screws and
removing the jumpers as shown below, connect an external
power supply in the procedure shown below.
1) Loosen the upper screws.
2) Remove the lower screws.
3) Remove the jumpers.
4) Connect the separate power supply cable for the
control circuit to the lower terminals (R1/L11, S1/
L21).
1) Remove the upper screws.
2) Remove the lower screws.
3) Remove the jumpers.
4) Connect the separate power supply cable for the
control circuit to the upper terminals (R1/L11, S1/
L21).
1) Remove the upper screws.
2) Remove the lower screws.
3) Remove the jumpers.
4) Connect the separate power supply cable for the
control circuit to the upper terminals (R1/L11, S1/
L21).
A700 F700
z FR-A720-0.4K to 3.7K, FR-A740-0.4K to 3.7K
FR-F720-0.75K to 5.5K, FR-F740-0.75K to 5.5K
z FR-A720-5.5K, 7.5K, FR-A740-5.5K, 7.5K
FR-F720-7.5K, 11K, FR-F740-7.5K, 11K
R1/L11
S1/L21
T/L3
S/L2
R/L1
S1/L21
R1/L11
Main circuit terminal block
3)
1)
2)
4)
3)
4)
1)
2)
Main circuit
terminal block
R1/L11
S1/L21
T/L3
S/L2
R/L1
S1/L21
R1/L11
z FR-A720-11K or more, FR-A740-11K or more,
FR-F720-15K or more, FR-F740-15K or more
(1) Do not turn OFF the control power (terminal R1/L11,
S1/L21) with the main circuit power (terminal R/L1, S/
L2, T/L3) ON.
When the main circuit power supply is ON, a DC
voltage exists in the converter output area and the
voltage is being applied to the transistors. If a signal
enters the transistor gate circuit due to noise etc., the
transistors conduct and the terminals P/
+
and N) are
connected, which may damage the transistor modules.
When the control power supply is ON, an inverse bias
voltage is applied to the gate circuit to prevent the
transistors from conducting.
The circuit should be configured so that the main
circuit power is also turned OFF when the control
power is OFF.
(2) If the MC of the main circuit power supply is switched
OFF (for more than 0.1s), then ON, the inverter is
reset. Hence, the method may be used to perform
fault-on reset.
(3) If the MC for the main circuit power is switched OFF
once (for more than 0.1s), then ON during the inverter
output (operation), the inverter is initial-reset and the
motor is restarted in the coasting state.
If the MC is switched OFF, the undervoltage (E.UVT)
protection is not activated.
V U W
R1/L11
S1/L21
R/L1 S/L2 T/L3
R1/L11 S1/L21
MC
FR-A720-11K
FR-A740-11K, 15K
FR-F720-15K
FR-F740-15K, 18.5K
FR-A720-15K, 18.5K, 22K
FR-A740-18.5K, 22K
FR-F720-18.5K, 22K, 30K
FR-F740-22K, 30K
FR-A720-30K or more
FR-A740-30K or more
FR-F720-30K or more
FR-F740-30K or more
Power supply
terminal block
for the control circuit
Power supply terminal block
for the control circuit
Power supply terminal
block for the control
circuit
Main power supply
3)
4)
1)
2)