User Manual

3UG4 / 3RR2 monitoring relays

Manual, 02/2013, NEB927043002000/RS-AA/002

279

3UG4641 cos phi and active current monitoring relay

12.1 Application areas

Application areas

The cos phi and active current monitoring relays are used, for example, in the following

application areas:

Table 12- 1 Application areas of the cos phi and active current monitoring relays

Function Application

• No-load monitoring and load shedding

• Underload monitoring in the low-end

performance range

• Monitoring for overload

• Simple cos phi monitoring in power systems

for controlling compensation systems

• Cable break between the control cabinet and

the motor

• Fans (in the case of a broken fan belt, for

example)

• Pumps (in the case of an idling pump, for

example)

• Filter system (a contaminated filter system, for

example)

• Reactive power compensation

• Sawing system

• Conveyor belt

• Surface grinding machine

• Breaking mill

• Milling machine

• Car wash

• Lifting platform

• Screw conveyor

• Crane

• Turning machine

• Infrared heating system