Question:
Which cycle is to be adhered to when the mains voltage is switched off and on in order to ensure that the components of the starting current limitation are not overloaded?
Answer:
The supply voltage of the axis modules is permitted to be switched off and immediately on again five times within five minutes without overloading the components of the starting current limitation. Axis modules up to device size 6 (59 A / 30 kW) can directly be supplied with DC or AC voltage. The mains switching cycle applies to both variants.
Axis modules as of device size 7 can only be supplied with AC voltage since here the starting current is limited on the AC side. The switching cycle rule mentioned before (five times in five minutes) is valid here, too. The charging circuit, consisting of a controlled semiconductor and a temperature-dependent resistor (thermistor), limits the charging current automatically if the mains switching process has already been executed several times and, as a result, the components of the charging current limitation have already been heated. Therefore, the charging process may slightly be prolonged.
The adherence to the switching cycles is clearly indicated in the documentation of the device technology (Hardware Manual, Mounting Instructions) under the headword 'Device protection' in the chapter 'Residual hazards'.
