Eaton NRX Instruction Manual

Also see for NRX: Installation instructions

54Section 7: Inspection and maintenanceSeries NRX with PXR - type RF low voltage power (air) circuit breakers instruction manual MN013002ENH03 September 2016 www.eaton.comFigure 61. Typical nameplate information.Manual operation functional testPerform the following seven steps and verify if the circuitbreaker is appropriately opened or closed as indicated bythe indicator flags on the front of the breaker (Figure 4).Step 1: Charge the mechanism springs using charging han-dle or motor operator.Step 2: Press the ON pushbutton to close breaker manually.Step 3: Charge the mechanism springs using either thecharging handle or motor operator. (If using motor opera-tor, disconnect the power to motor to prevent automaticrecharging).Step 4: Press the OFF pushbutton to manually open thebreaker.Step 5: Press the ON pushbutton to manually close thebreaker.,V,V,V,VRYSC303WType RFInterrupting RatingsInsulated Case Circuit Breaker3000 A max.208-250 V24 V220-250 V3 PoleRMS Symmetrical AmpereVolt kA100kA100kA240~480~50/60 Hz160730Customer P.O.G.O.0716RYSC303WMAARTLR2ZADXInstruction manual - MN013002ENUse in cassette RY3032134Step 6: Press the OFF pushbutton to manually open thebreaker.Step 7: Repeat the first six steps three times.Electrical operation functional testThis test procedure is based on the assumption that thecircuit breaker is equipped with both a shunt trip and springrelease. If one of the accessories is missing, use themanual button to replace the accessory’s function. Performthe following seven steps and verify if the circuit breaker isappropriately opened or closed as indicated by the indicatorflags on the front of the breaker (Figure 4).Step 1: Charge the mechanism springs using the charginghandle or motor operator.Step 2: Close the breaker by applying the rated voltage tothe spring release accessory.Step 3: Charge the mechanism springs using either thecharging handle or motor operator. (If using motor operator,disconnect power to motor prevent automatic recharging.)Step 4: Open the breaker by applying the rated voltage toshunt trip accessory.Step 5: Close the breaker using the spring release acces-sory.Step 6: Open the breaker using the shunt trip accessory.Step 7: Repeat the first six steps three times.Trip unit test procedureThe trip unit may be tested via its front panel display inter-face or through the USB connection to a PC with the PowerXpert Protection Manager installed. Refer to the instructionmanual for series NRX PXR 20/25 for instructions on test-ing via the display interface. For testing through the USBinterface, refer to the quick start guide for the “Power XpertProtection manager software”.Arc chute inspectionWhen a circuit breaker experiences a high level fault, or dur-ing regularly scheduled maintenance periods, the arc chutesshould be inspected for any kind of damage or dirt. Beespecially alert for signs of significant erosion within the arcchute.To remove the arc chutes and inspect both the arc chutesand arc chambers, proceed with the following seven steps.Step 1: (Drawout breakers) Locate the metal latches on eachside of the breaker secondary contact assembly. Rotate thelatch on one side by using a small tool to press the lowerportion of the latch and release the light grey inner cradlewhich houses the accessory plugs. Push the inner cradle ina small amount to keep the latch disengaged (inner cradlewill be angled). While holding the inner cradle in this posi-tion, rotate the second metal latch in a similar manner.