Code 2101: NCK battery alarm

Definitions: The undervoltage monitoring (2.4 - 2.6 V) of the NCK battery has responded during cyclic operation. Reaction: Alarm display. Remedy: If the NCK battery is replaced without interrupting the power supply, no data will be lost. This means that production can continue without taking any furt her steps. (A buffer capacitor on the NCK holds the supply voltage for at least 30 minutes and the batte ry can be replaced within this time even when the control is switched off). Sinumerik combines an NCU's two potential parts s ubject to wear (fan/battery) in one shared mechanically replacable module the constr uction of which is easily accessible. When the battery module is unplugged during operation, the module is also separated from the fan's air supply. Therefore the battery should only be replaced during oper ation, if production cannot be continued otherwise. If it is not possible to replace th e battery quickly, a second fan/battery module should be available for use during the replacement process. It should be plugged onto the NCU during replacement of the battery. In this context please note for the safety function of t he '840D sl' that it will switch off the module automatically after a certain time, if the fan is defect or not plugged in; this will protect the NCU from thermal destruction (see Manual: chapter Dual fan/battery module). Program Continuation: Clear alarm with the Delete key or NC START.