Mitsubishi Electric FR-S500 Series, Инструкция по эксплуатации

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Failsafe of the system which uses the inverter
1.9 Failsafe of the system which uses the inverter
When a fault occurs, the inverter trips to output an alarm. However, an alarm output
signal may not be output at an inverter alarm 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 Check Method Used Signals Refer to Page
1)
Inverter protective
function operation
Operation check of an
alarm contact
Circuit error detection by
negative logic
Alarm output signal
(ABC signal)
110
2)
Inverter running
status Operation ready signal
check Operation ready signal
(RY signal)
110
3)
Inverter running
status
Logic check of the start
signal and running
signal
Start signal
(STF signal, STR signal)
Running signal
(RUN signal)
29, 110
4)
Inverter running
status
Logic check of the start
signal and output
current
Start signal
(STF signal, STR signal)
Output current detection
signal
(Y12 signal)
29, 97, 110
1) Check by the inverter alarm output
signal
When the inverter protective function
is activated to stop the inverter
output, the alarm output signal (ABC
signal) is output (ABC signal is
assigned to terminal ABC in the initial
setting).
Check that the inverter functions
properly.
ON
Reset processing
(about 1s)
OFF
Reset ON
Output frequency
ABC
(when output
at NC contact)
RES
Inverter alarm occurrence
(output shutoff)
Time
OFF
ON