Leakage currents
When operating servo drives, operationally related leakage currents occur in various frequency ranges. In addition, it is possible for a smooth DC residual current (ohmic) to be produced after the rectifier. These currents would prevent a residual current circuit breaker (RCCB or RCD) of the type A or AC from tripping. In the event of a fault, therefore, it would be possible for dangerous voltages to be present on the housing parts. The legal regulations in various countries demand the use of AC/DC-sensitive RCDs in three-phase applications. These should have a rated residual current of ≤ 300 mA.
 | Calculation bases for leakage currents Note that no exact value is calculated for the leakage currents, but rather the maximum expected value, with associated variance. The leakage current values given in the table are based on the following: - original Beckhoff motor cables are used - shielding and grounding concepts are adhered to Composition of the maximum total leakage current The maximum total leakage current is composed of: - device-dependent fixed part with 50 Hz; single-phase supply or 150 Hz; three-phase feed - variable part that depends on the motor cable length and clock frequency. If no other specifications are applied, the clock frequency is around 8 kHz. The leakage currents of the individual modules add up. |
Leakage currents IABFix [mA] | ||||
|---|---|---|---|---|
Servo drive | 1x 230 VAC; 50 Hz | 1x 240 VAC; 60 Hz | 3x 400 VAC; 50 Hz | 3x 480 VAC; 60 Hz |
AX8108 | 4.1 | 4.6 | 3.5 | 4.4 |
AX8118 | --- | --- | 4.5 | 5.6 |
AX8206 | 4.1 | 4.6 | 3.5 | 4.4 |
AX8620 | 7 | 7.9 | 4.5 | 4.4 |
AX8640 | --- | --- | 4.5 | 4.4 |