| Measured variable | Possible plant/system faults | Possible effects |
| Undervoltage | voltage variations, blown fuse, wire breakage |
Failure and destruction of motors due to overheating, accidental resetting of a device, undefined switching states and dangerous situations in the electrical installation, accidental start-up; |
| Overvoltage | voltage variations | Damaged parts of the installation due to overvoltage, accidental start-up of a device/system |
| Phase sequence | conductors reversed, faulty extension cords |
Wrong rotational direction of a motor, destruction of roller drives, Hazardous situations to man and machine when using mobile devices and systems |
| Phase failure | blown fuse, wire breakage |
Failure of control voltage, overheating of motors due to single-phase operation |
| Phase asymmetry | asymmetrical distribution of the load, phase failure with reverse fed voltage |
Overheating of motors due to asymmetrical voltages, failure of parts of the installation |
| Measured variable | Application |
| Current monitoring | Power consumption of motors e.g. in cranes, pumps, elevators Monitoring of lighting systems, heating circuits, charging stations Overload control of hoisting gear and means of transportation Monitoring of locking devices, driving onto terminal racks Monitoring of emergency lighting Monitoring of navigation lighting on high-rise buildings Monitoring of screw conveyors , e.g. in sewage plants, in case of blocking of conveyer systems Dust removal in wood working Monitoring of small currents, e.g. low-power motor, indicator lamps |
