Eaton IZM40 Operation And Maintenance Instructional Manual

Also see for IZM20: Manual Manual Instructions

Contents

4710/09 AWB1230-1605Effective October 2009Operation and maintenance ofIZM low voltage air circuit breakerMOELLER www.moeller.net/de/upport CaUTiOnTO PrEVEnT DaMagE TO THE raTing PLUg, DO nOT FOrCE iT inTO THEMOUnTing CaViTY.Use the same 1/8-inch screwdriver to tighten the M4 screw andsecure the rating plug in the trip unit. The maximum torque on themounting screw is 15 in-oz (0.1 Nm). Close the rating plug door.Current enor replacement nOTiCErEMEMBEr THaT THE TriP UniT’S raTing PLUg anD THE CirCUiTBrEakEr’S CUrrEnT SEnSOrS MUST HaVE MaTCHing raTingS.The three current sensors are installed at the rear of the circuitbreaker on the lower terminals. A cover with sensor ratingviewing windows covers the sensors and is held in place withscrews (Figure 73). Remove the cover by removing the screws.Figure 73. Current Sensor Cover in Place Over SensorsCurrent Sensor CoverIf the circuit breaker is a drawout configuration, the lower primarydisconnect finger clusters and the vertical adapters must first beremoved from frame sizes up to 2500A. On the 3200A frame, boththe upper and lower primary disconnects and vertical adapters mustbe removed. Each primary disconnect finger cluster is removedby loosening the two hex-head bolts with a 10 mm wrench. Thesebolts do not have to be completely removed to slide the primarydisconnects off of the terminals. Remove the vertical adapters nextfrom the circuit breaker terminals by removing the two or three10 mm bolts holding them in place (Figure 74).The current sensors are removed by pulling them off of theterminals and unplugging the wiring plugs from the sensors(Figure 74).Install new current sensors by connecting the wiring plugs to thesensors and sliding the sensors over the terminals. Reinstall thecover over the sensors and secure in place with the screwspreviously removed.Reinstall the previously removed vertical adapters to the terminalsusing the removed hardware and 40 ft-lb (55 Nm) of tighteningtorque. Make sure the vertical adapters are square to the rearhousing. Slip the primary disconnects on to the vertical adapters.Make sure the primary disconnects are fully inserted on to thevertical adapters. Tighten the two retention bolts to 40 in-oz (5 Nm)of torque. Properly engaged and secured retention bolts shouldengage the slots or holes in the vertical adapters.Figure 74. One Current Sensor Shown Removed andDisconnectedCurrent SensorWiring PlugVertical Adapters