Load guard for 1- and 3-phase motors 3x400VAC - 1,2A
Measures power factor (cos phi)
Adjustable time delay 0,1-30 sec. by start-up
Adjustable reaction delay 0,1-30 sec.
Measuring output in proportion to the consumption
1-pole relay output
400V AC supply
C-mac® module type RP91 is used for power monitoring of 1-phase and symmetrical 3-phase loads, for example motors. RP91 can be connected directly to loads with nominal current consumption up to 6A. If the current is bigger, a standard transformer must be used. The module is provided with adjustable start-up relay, which ensures that the relay output is active independant of the load, when the motor starts. RP 91 is provided with both over- and under load guard. The module is monitoring the total power consumption (U x I x cos phi), which gives a much higher sensivity than RP81offers.
The setpoint can be roughly adjusted at a 10-positions switch, and as well it is possible to fine adjust the setpoint at a potentiometer at the front of the module, and this gives a higi sensivity for the adjustment function. When the setpoint is reached, an adjustable time delay between 0,1 to 30 sec. starts. Afterthis period the relay will drop off provided that the load has been higher than the setpoint throughout the period. In this way it is secured, that the relay not will drop off by short changes in the power consumption. For being able to give the most precise setpoint adjustment - especially when very small loads are monitored - the module is provided with 4 different current ranges, and all units are accessible with inverter functions to detect under loads.