RIGENERATIVE
SINUS PENTA
APPLICATION
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A047 Undervoltage
A047
Description
DC-bus voltage lower than Vdc_min.
Event
Voltage measured in DC bus capacitors has dropped below the min.
value allowed for the proper operation of the drive class being used.
Possible causes
•
Supply voltage has dropped below 200VAC–25% for 2T class,
380V–35% for 4T class, 500V – 15% for 5T class, 600VAC – 15% for
6T class. Also, the drive is not capable of regulating DC-bus voltage
due to a great load demand.
•
Alarm A047 may trip even when the mains voltage drops below
the preset threshold for some time (for example due to direct load
connection).
•
Mains voltage failure (even of one phase only).
•
Failure in DC-bus voltage measure circuit.
Solutions
1.
Check if voltage is supplied to the 3 mains phases (terminals R,
S, T). Check mains voltage measured in M502 and check DC-bus
voltage measured in M501. Also check the values of these measures
which are sampled in the FAULT LIST as soon as the alarm trips.
2.
If the alarm persists, please contact ELETTRONICA SANTERNO’s
After-sales service.