GE C70 Instruction Manual

Also see for C70: Communications manual Communications guide Instruction manual Instruction manual Instruction manual

Contents

7-16 C70 CAPACITOR BANK PROTECTION AND CONTROL SYSTEM – INSTRUCTION MANUALTARGETS MENU CHAPTER 7: COMMANDS AND TARGETS77.2.2.4 HardFiber major self-test error messagesIn addition to those provided by the standard UR-series devices, the UR devices implement HardFiber self-tests. These arelisted here. Any abnormal diagnostic condition indicated by the LEDs or the critical failure relay also results in a self-testmessage, so troubleshooting is described here. For other relays, such at the B95Plus, see that product’s instruction manual.• Description of problem: The number or type of installed hardware modules does not match the order code stored inthe CPU. The standard UR-series Equipment Mismatch self-test is extended to cover the possible presence of aProcess Card.• Severity: Protection is not available and all contact outputs and shared outputs are de-asserted.• What to do: Check all modules against the order code. Ensure they are inserted properly, and cycle the control power.If a module has intentionally been added or removed use the Update Order Code command to notify the relay that thecurrent module configuration is correct.• Description of problem: UR-series device module hardware failure detected.• Severity: Protection is not available and all contact outputs and shared outputs are de-asserted.• What to do: Contact the factory and supply the failure code noted in the display. Text in the message identifies thefailed module (for example, H81). If operated on a Process Card failure, the Module Fail self-test seals-in (latches) till theUR-series device is restarted.• Description of problem: Mission critical data is not available via the process bus. An AC quantity is considered critical ifboth AC bank origins and the crosschecking settings are other than None. This self-test is also initiated by an AC inputdiscrepancy being detected. See the description in the Crosschecking setting in the HardFiber manual for furtherinformation. In addition, this self-test can be initiated by user logic responding to loss of critical contact input/outputor other data using the Process Bus Failure Operand user-programmable self-test setting. This setting is located inthe Settings > Product Setup > User-Programmable Self Test menu.• Severity: Protection is not available and all contact outputs and shared outputs are de-asserted.• What to do: First rectify any Process Bus Trouble and Brick Trouble self-test errors. Check the actual value of theoperand referenced by the Process Bus Failure Operand setting, and if “On,” determine the cause and rectify.If the problem persists with the foregoing all clear, the cause must be an AC input discrepancy, which is typically theresult of problems in the input signals to the Bricks, or faults in the Brick input conditioning hardware. If the error wasannunciated the first time significant signal was encountered, suspect the former cause and check the copperconnections external to the Brick. Where multiple UR-series devices have self-test errors, look for common causes.To further isolate AC input discrepancy errors, put the relay in test-isolated mode, then one by one, temporally changean AC bank Crosschecking setting to None, until the Process Bus Failure clears. Once the problem AC bank has beenidentified, the values from each of the two Bricks can be examined individually by temporarily mapping each to an ACbank with a single origin.7.2.2.5 HardFiber minor self-test error messages• Description of problem: Communications problems with one or more Bricks. The text of the message identifies theaffected field units. This self-test is initiated by low received signal levels at either the Brick or Process Card end, andby the sustained failure to receive poll responses from the proper Brick.EQUIPMENT MISMATCHMODULE FAILUREPROCESS BUS FAILUREPROCESS BUS TROUBLE