Load guard RP81
Load guard RP81
| Load guard for 3-phase motors Power factor metering (cos phi) Adjustable time delay 0-20 sec. at motor start Selectable release of relay at max. or min. load 1-pole relay output 8A / 250 VAC Made in accordance with the CE and EMC regulations |
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| The C-mac module type RP81 is used for load monitoring of 3-phase
motors, as the phase angle (cos phi) between motor current and -voltage changes in
proportion to the mechanical load of the motor. You will see the biggest change in phase angle, if the motor is loaded between 0 and 60% of nominal load, which makes the RP81 suitable for monitoring of V-belts, pumps running dry, etc. RP81 can be connected directly to motors with nominal current up to 6 A. If the current is bigger, you use a standard current transformer. The unit is supplied with an adjustable start-up delay, which keeps the output relay activated independant of the power consumption, when the motor is starting. By connection of pins 7 and 2 you can select if the relay releases at over- or underload. |
Connection diagram:
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Standard supply
voltages:
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