Mitsubishi Electric FR-D720S SC EC, Instruction Manual

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Troubleshooting Check first when you have troubles
FR-D700 SC EC 7 - 21
7.6 Check first when you have troubles
7.6.1 Motor does not start
Check points Possible Cause Countermeasures
Refer to
Page
Main Circuit
Appropriate power supply voltage is not
applied.
(Operation panel display is not provided.)
Power ON a moulded case circuit breaker
(MCCB), an earth leakage circuit breaker
(ELB), or a magnetic contactor (MC).
—
Check for the decreased input voltage,
input phase loss, and wiring.
Motor is not connected properly.
Check the wiring between the inverter and
the motor.
3-6
The jumper across P/+ and P1 is discon-
nected.
Securely fit a jumper across P/+ and P1.
When using a DC reactor (FFR-HEL-(H)-
E), remove the jumper across P/+ and P1,
and then connect the DC reactor.
3-42
Input Signal
Start signal is not input.
Check the start command source, and
input a start signal.
PU operation mode: RUN key
External operation mode : STF/STR signal
6-175
Both the forward and reverse rotation start
signals (STF, STR) are input simultane-
ously.
Turn ON only one of the forward and
reverse rotation start signals (STF or
STR).
When the STF and STR signals are turned
ON simultaneously, a stop command is
given.
3-13
Frequency command is zero.
(RUN LED of the operation panel flickers.) Check the frequency command source
and enter a frequency command.
6-175
AU signal is not ON when terminal 4 is
used for frequency setting.
(RUN LED of the operation panel flickers.) Turn ON the AU signal.
Turning ON the AU signal activates termi-
nal 4 input.
6-147
Output stop signal (MRS) or reset signal
(RES) is ON.
(RUN LED on the operation panel flickers
while MRS signal is ON.)
Turn MRS or RES signal OFF.
Inverter starts the operation with a given
start command and a frequency command
after turning OFF MRS or RES signal.
Before turning OFF, ensure the safety.
6-91,
7-17
Jumper connector of sink - source is
wrongly selected.
(RUN LED of the operation panel flickers.)
Check that the control logic switchover
jumper connector is correctly installed.
If it is not installed correctly, input signal is
not recognized.
3-22
Shorting wires between S1 and SC, S2
and SC are disconnected. Short between S1 and SC, S2 and SC
with shorting wires.
3-13
Voltage/current input switch is not cor-
rectly set for analog input signal
(0 to 5V/0 to 10V, 4 to 20mA).
(RUN LED of the operation panel flickers.)
Set Pr. 73, Pr. 267, and a voltage/current
input switch correctly, then input an analog
signal in accordance with the setting.
3-22
The STOP/RESET key was pressed
(Operation panel indication is "PS".)
During the External operation mode,
check the method of restarting from a
STOP/RESET key input stop from PU.
7-7
Two-wire or three-wire type connection is
wrong.
Check the connection.
Connect STOP signal when three-wire
type is used.
6-94