Undervoltage in power section

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The IndraDrive MPx02 has detected an undervoltage condition within its internal power section (DC bus voltage has dropped below a critical threshold). This is a warning state that precedes a fault if the condition persists, impacting drive performance and potentially leading to a controlled shutdown to protect the drive.

• Insufficient incoming AC mains voltage to the drive.
• Temporary voltage sag or brownout on the mains supply.
• Excessive current draw during heavy loading conditions leading to DC bus ripple or collapse.
• High resistance in the power cabling to the drive, causing voltage drop.
• Internal issues with the drive's DC bus capacitor bank or charging circuit.

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1. 1

   Measure the incoming AC mains voltage at the drive input terminals (L1, L2, L3) and compare it to the drive's nominal voltage setting (P-0-0120).

2. 2

   Monitor the DC bus voltage (e.g., via drive diagnostics) to observe its behavior and confirm the undervoltage during operation, especially during acceleration or heavy load.

3. 3

   Inspect all power cable connections to the IndraDrive MPx02 for looseness, corrosion, or inadequate sizing that could cause voltage drops under load.

4. 4

   Reduce the mechanical load or adjust the application's duty cycle to minimize peak current demands if the undervoltage occurs during heavy transients.

5. 5

   If the supply voltage is stable and correct, but the warning persists, contact Indramat service for internal drive diagnostics.