Rapid undervoltage detection
The voltage on the A-side or the B-side is monitored in this case. Monitoring is started at an interval of 0.5 ms. If this monitoring detects "Grid ON", the relevant bit is set in parameter "8809.24 Grid condition".
The term "Grid" is not generally to be equated with the AC supply system. In the case of the MDE90A DC/DC converter module, the term relates to the connected DC supply accordingly.
Rapid undervoltage detection can be set using the following parameters:
- Response of the device to undervoltage using parameter "8351.10"
- No response
- Warning
- The device signals fault "E7.7 Undervoltage A- or B-side". The parameter "8809.24 Grid condition" is not adjusted.
- Output stage inhibit
- With this setting, the device does not signal any faults but it changes to the state "Not ready". This means the output stage is inhibited and the display shows "00". The device status is adapted accordingly. The bit "DC 24 V standby mode" is set into the status bit "Not ready – power supply" as the reason for "Not ready". The flag "Line voltage on" is set to 0 in parameter "8809.24 Grid condition".
- Selection of the output stage end to be monitored using parameter "8351.11"
- None
- A-side
- B-side
- Both (the voltages on the A-side and B-side must be below the set limit)
- Voltage level for detection of undervoltage using parameter "8351.12"
- If the DC voltage is undershot on the A-side or the B-side, this is interpreted as undervoltage depending on the setting of parameter 8351.11.
- If this value is underrun, the response to undervoltage is performed according to parameter "8351.10".
