Leakage currents

During the operation of servo drives, leakage currents with different frequencies occur due to pulse modulation. Classic ground fault circuit interrupters or RCDs of type A or AC can hardly or not at all detect leakage currents greater than 50 Hz, so that no tripping results despite a high leakage current. For this reason, the legal regulations in various countries stipulate that all-current sensitive RCDs must be used for three-phase applications. These should have a rated residual current of ≤ 300 mA.

The determination of the leakage current depends on various factors, such as the cable length, the supply voltage and the load on the motors during operation. Consequently, it is difficult to calculate an exact value for an AMP8000 system. However, it can be assumed that the leakage current will be above 30 mA.