Infeed: Summation current too high

What does 206210 mean?

The smoothed total of the phase currents (i1 + i2 + i3) exceeds 4% of the maximum power unit current (r0209). This severe condition often indicates a DC link ground fault, which can introduce a DC component into the line currents, potentially damaging or destroying the power unit, line reactor, or line filter. Other causes include uncalibrated current measurement or a defective current measurement in the power unit.

• Ground fault (earth fault) on the DC link (terminals DC+ or DC-) of the infeed unit or connected components.
• Short circuit between one of the phase output terminals (U, V, W) and ground within the drive system.
• Faulty insulation in the motor cable or motor winding, causing a current path to ground.
• Incorrectly rated or faulty ground fault monitoring circuit in the infeed unit.
• Contamination (e.g., coolant, metal dust) on busbar connections causing a leakage path to ground.

Click steps to track your progress.

1. 1

   Disconnect the motor cable from the drive output and measure insulation resistance between motor phases and ground, and phase-to-phase, using a megohmmeter (e.g., 1000V DC).

2. 2

   Isolate sections of the DC link (disconnect motors, braking resistors, other drives) to pinpoint the ground fault location.

3. 3

   Measure insulation resistance of the DC busbar connections (DC+ to ground, DC- to ground) using a megohmmeter.

4. 4

   Check parameter P0209 (Max. power unit current) and P0210 (Rated motor current) to ensure correct scaling.

5. 5

   Verify integrity of current sensors within the infeed unit by comparing readings with an external clamp meter if possible.