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Failsafe Of The System Which Uses The Inverter - Mitsubishi Electric FR-F700PJ Instruction Manual

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3.6

Failsafe of the system which uses the inverter

When a fault occurs, the inverter trips to output a fault signal. However, a fault output signal may not be output at an inverter
fault occurrence when the detection circuit or output circuit fails, etc. Although Mitsubishi assures best quality products,
provide an interlock which uses inverter status output signals to prevent accidents such as damage to machine when the
inverter fails for some reason and at the same time consider the system configuration where failsafe from outside the inverter,
without using the inverter, is enabled even if the inverter fails.
(1) Interlock method which uses the inverter status output signals
By combining the inverter status output signals to provide an interlock as shown below, an inverter alarm can be
detected.
No.
Interlock Method
Inverter protective function
1)
operation
2) Inverter operating status
3) Inverter running status
4) Inverter running status
1)Check by the inverter fault output signal
When the inverter's protective function activates and the
inverter trips, the fault output signal (ALM signal) is output.
(ALM signal is assigned to terminal ABC in the initial
setting).
With this signal, you can check if the inverter is operating
properly.
In addition, negative logic can be set (ON when the inverter
is normal, OFF when the fault occurs).
2)Checking the inverter operating status by the inverter
operation ready completion signal
Operation ready signal (RY signal) is output when the
inverter power is ON and the inverter becomes operative.
Check if the RY signal is output after powering ON the
inverter.
3) Checking the inverter operating status by the start signal
input to the inverter and inverter running signal.
The inverter running signal (RUN signal) is output when the
inverter is running (RUN signal is assigned to terminal RUN
in the initial setting).
Check if RUN signal is output when inputting the start signal
to the inverter (forward signal is STF signal and reverse
signal is STR signal). For logic check, note that RUN signal
is output for the period from the inverter decelerates until
output to the motor is stopped, configure a sequence
considering the inverter deceleration time.
Failsafe of the system which uses the inverter
Check Method
Operation check of an alarm contact
Circuit error detection by negative logic
Operation ready signal check
Logic check of the start signal and
running signal
Logic check of the start signal and output
current
Used Signals
Fault output signal
(ALM signal)
Operation ready signal
(RY signal)
Start signal
(STF signal, STR signal)
Running signal (RUN signal)
Start signal
(STF signal, STR signal)
Output current detection signal
(Y12 signal)
Inverter fault occurrence
(trip)
ALM
ON
OFF
(when output
at NC contact)
ON
RES
Reset ON
Power
ON
supply
ON
STF
ON
RH
Pr. 13 Starting frequency
Reset
processing
ON
RY
ON
RUN
Refer to Page
143
142
138, 142
138, 146
Time
OFF
Reset processing
(about 1s)
OFF
OFF
DC injection brake
operation point
DC injection
brake operation
Time
OFF
OFF
55
3

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