Rockwell Automation Allen-Bradley 1502 - Altitude Adjustment

4-18 Maintenance
1502-UM051E-EN-P – June 2013
Altitude Adjustment 7BDVVNDPOUBDUPSTBSFTFOTJUJWFUPUIFBMUJUVEFBUUIFJOTUBMMBUJPOTJUFăJTJTEVF
to the fact that the atmospheric pressure assists in closing the main contacts by
FYFSUJOHGPSDFPOUIFCFMMPXTBUUIFNPWBCMFFOEPGUIFWBDVVNCPUUMFT4JODF
UIJTGPSDFJTQSPQPSUJPOBMUPUIFEJĈFSFODFCFUXFFOJOUFSOBMCPUUMFQSFTTVSFBOE
FYUFSOBMBUNPTQIFSJDQSFTTVSFUIFSFUVSOTQSJOHNVTUCFBEKVTUFEGPSUIFBQ-
QSPQSJBUFBMUJUVEFT$POUBDUPSTBSFGBDUPSZTFUGPSUIFBMUJUVEFBUXIJDIUIFZBSF
PSJHJOBMMZJOTUBMMFE*GBDPOUBDUPSJTSFMPDBUFEUPBEJĈFSFOUBMUJUVEFSBOHFTFF
5BCMF"BTQSJOHBEKVTUNFOUJTOFDFTTBSZGPSQSPQFSPQFSBUJPO
 ăFGPMMPXJOHQSPDFEVSFTIBMMCFVTFEUPNBLFUIFDPSSFDUTFUUJOHT
  %FUFSNJOFXIBUBMUJUVEFSBOHFUIFDPOUBDUPSJTTFUVQGPSCZDIFDLJOHUIF
SBUJOHMBCFMBMTPSFGFSUPUIF$BUBMPH/VNCFS&YQMBOBUJPO
  .FBTVSFBOESFDPSEEJNFOTJPOi"uBTTIPXOQFS'JHVSF
Note%JNFOTJPOi"uXJMMWBSZGSPNDPOUBDUPSUPDPOUBDUPSUIFSFJTOP
predetermined value.
Compression Bolt
Locking Nut
Return Spring
AA
Figure 4.24 – Return Spring Assembly
  -PPTFOUIFDPNQSFTTJPOCPMUMPDLJOHOVUBOEBEKVTUUIFQPTJUJPOPGUIF
DPNQSFTTJPOCPMUBDDPSEJOHUP5BCMF"%JNFOTJPOi"uJTDIBOHFECZUIF
BNPVOUTIPXOPOUIFUBCMF'PSFYBNQMFJGUIFDPOUBDUPSTFYJTUJOHSBOHF
JTNBOEUIFEFTJSFESBOHFJTNJODSFBTFEJNFOTJPOi"u
CZNNJO*GUIFDPOUBDUPSTFYJTUJOHSBOHFJTN
BOEUIFEFTJSFESBOHFJTNEFDSFBTFEJNFOTJPOi"uCZNN
JO"ĕFSEJNFOTJPOi"uIBTCFFOTFUGPSUIFEFTJSFEBMUJUVEFSBOHF
SFUJHIUFOUIFMPDLJOHOVU