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Inverter A0503 can not eliminate the pressure
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Converter under voltage alarm A0503 can not eliminate my hand has a project using the MM440 inverter and other projects of the company are converter outlet and the contactor, but the project owner requirements inverter line to the contactor. So the background is MM440 main power supply into the line and there are contacts.
When the PLC after a stop command, inverter, and into the line contactor also disconnect at this time will appear under voltage alarm A0503. began to think of not in the right order, and modify the delay to cut off the main power source. But this is not a pressure alarm or eliminate. How to remove this alarm.
Answer: when the frequency converter into the line, it will not appear this alarm, you enter the line contactor as long as the disconnection, it will appear normal.
Your design according to the common sense is not correct, according to the foreign safety standards, inverter line is to add contacts, but the contactor not every is disconnected, when the PLC after a stop command and inverter to stop (stop signal only to the inverter and not to give into the line contactor).
Under normal circumstances, into the line contactor stop is for emergency stop loop or higher safety requirements of the occasion, if the requirements of your, I suggest you when the PLC after a stop command, only the inverter to stop continuously entered the line contactor. So you don't have to call the police.
Otherwise, at the same time into the line contactor also disconnected, you can only alarm, so there is no impact.
1, A0503 - less pressure limit alarm.
Alarm reason:
Power supply failure;
Power supply capacity may be small;
Voltage parameters (P0210) of the power supply are not in conformity with the actual situation;
The DC loop voltage (r0026) is lower than the specified limit value (P2172).
Measures can be taken:
1) supply voltage (P0210) within the value must be limited in the nameplate data.
2) for the instantaneous power or voltage drop must be insensitive.
3) enable dynamic buffering (P1240=2).
2, if no such reasons, then check whether the r0026 parameter is close to the actual measurement of the DC link voltage value. If less than the actual value, it is possible that the voltage detection circuit is a problem.
3, in addition, remember to verify your power capacity is adequate, the inverter before the level of the line reactor.
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