GE SPM Series Instruction Manual

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Contents

GE SPM Series Instruction Manual Manual pdf 80 page image

7- 6SPM Synchronous Motor Protection & Control GE Power Management7.4 TROUBLESHOOTING 7 TESTING AND TROUBLESHOOTING77.4 TROUBLESHOOTING 7.4.1 TROUBLESHOOTING GUIDETable 7–1: SPM TROUBLESHOOTING (Sheet 1 of 2)SYMPTOM POSSIBLE CAUSE CORRECTIVE ACTIONThe SPM READYmessage is notdisplayed atpower-up (motornot running).Control voltage missing. Check control fuses in synchronous controller (on primary andsecondary of control power secondary).Connection plug is missing. Insert connection plug at bottom of cradle assembly (seeFigure....)Drawout cradle not fullyengagedCheck removable cradle assembly and confirm that the top andbottom rotating latches engage cradle and are positioned toengage connection to disconnecting sockets at rear of case.Wrong voltage is applied to theV1 and V 2 terminals.Control voltage must be in the range of 85 to 265 V AC.Display is frozen. Drop control power momentarily to the SPM and reapply. Someportion of the display should be actively blinking. If not, the CPU isnot functioning. Replace with a new SPM.Missing or improper motor-on,motor-off input to SPMAdd or correct the isolated normally closed interlock from the maincontactor or relay operated with the main contactor. Interlock is tobe placed across MX to MX1 interlocks.NOTE: This interlock must be open when the motor is engaged.SPM not properly programmed. Call each program address and check setpoint data against thedesired setpoints (usually listed in the controller elementary).If the exciter voltage option issupplied, exciter may not beenergizedCorrect the operation of the DC field exciter so it outputs DC.Relay in tripped condition. Press any keyboard button to RESET.Internal connector cable loose. Remove front panel and check ribbon connectors for tightness.Ensure connectors are not skewed or partially connected to pins.Wiring to terminal points onrear of unit are missing / loose.Connect or tighten missing/loose wires to proper points on therear of the unit.Motor starts butwill notsynchronize (FCdoes not close)Synchronizing slip set too low.Motor cannot accelerate to sliplevel.Refer to the setpoint programming instructions (Chapter 5) andprogram a higher value of percent slip.FAR relay does not pick up(SPM flashes FIELD IS APPLIEDbut contactor does not close).Check external FAR contact circuit wiring.Field discharge resistor(sometimes shippedseparately) is not connected orincorrectly installedCheck the connection of the field discharge resistor and correct ifnecessary.Motor trying to accelerateexcessive loadUnload or reduce load on motor shaft until FCX relay picks up.A motor restart is aborted bySCP operation (SQL CAGE TRIPdisplayed)The motor is taking too long to start or the stall time or run timesetpoint is set too low. Correct as necessaryWiring to terminal points aremissing or loose.Connect or tighten missing or loose wires to proper points on therear of the SPM.