Residual Current Operated Protective Device

Using Residual Current Protective Devices

When using a residual current protective device in combination with the Lexium 62 Drive System, certain conditions and restrictions must be considered. As a dc current component in the ground conductor may result from insulation damage or direct contact, residual current circuit-breakers of type A or AC may not be triggered and therefore must not be used. Moreover, during system power-up and also in normal operation the Lexium 62 Drive System can generate a significant leakage (touch) current which may lead to unintended triggering of a residual current protective device.

Consequently, observe the following when using residual current protective devices in combination with the Lexium 62 Drive System:

oOnly use universal current sensitive residual current circuit-breaker of type B.

oUse residual current protective devices with a latent time to prevent unintended triggering at system power-up.

oConsider the leakage (touch) current of the Lexium 62 Drive System in normal operation when selecting the triggering threshold of the residual current protective device.

oIf no residual current protective device or only a device with a high current threshold can be installed, appropriate other measures must be applied to provide protection against electrical shock and fire hazard