GE SPM Series Instruction Manual

Also see for SPM: Instruction manual

Contents

GE SPM Series Instruction Manual Manual pdf 77 page image

GE Power Management SPM Synchronous Motor Protection & Control7-37 TESTING AND TROUBLESHOOTING 7.2 DISPLAY AND MESSAGES77.2 DISPLAY AND MESSAGES 7.2.1 DISPLAYThe PQM uses the alphanumeric display to indicate the following information:• programming prompts• SPM trip explanations• readout of the desired motor running parametersThe motor running parameters are displayed as follows.• Before start, the SPM displays SPM READY.• While starting, the power factor and line amperes are displayed.• When the field contactor closes, the SPM momentarily displays FIELD IS APPLIED followed by the normalrunning display of line current, field current (if this option is furnished), and motor power factor. The “+” indi-cates leading power factor (motor generating reactive power) while "–" indicates lagging power factor(motor consuming reactive power). The unity (1.0) power factor display may have a "+" or "–" sign indicat-ing that power factor is just slightly leading or lagging.• Once the motor has synchronized, the SPM displays power factor, line current, field volts (if optioned), fieldcurrent (if optioned), and field ohms (if optioned).7.2.2 SPM MESSAGESThe SPM has a number of built-in messages that may appear during normal operation or if an error isdetected. Errors may occur because the CPU detects a problem internal to the SPM. These messages areexplained in detail below.• FIELD IS APPLIED: This message appears when the SPM has closed the field contactor. It is displayedbriefly and is a normal SPM function.• PWR FACTOR TRIP: The motor has been operating below the power factor setpoint too long causing a trip.• CHECK EXCITER: The field voltage is below the minimum entered in the field undervoltage setpoint. Theexciter should be checked to determine that it is functioning properly. Also, the setpoint should be exam-ined to see if it is set too high for the normal exciter output.• FIELD LOSS TRIP!: The field current is less than the field current setpoint. The exciter should be checked forproper output and the field current setpoint should be checked.• MISSING VOLTAGE!: The SPM is NOT receiving a power factor reference voltage input to terminals V1EXTand V 2EXT and PF REF is set to External.• SQL CAGE TRIP!: The SPM has tripped the motor off-line due to a squirrel cage protection trip. The motormust be allowed to cool for the amount of time displayed by the SPM.• PULL-OUT TRIP!: A trip has been caused by motor line current exceeding 4 times the full load current set-point for longer than the PF delay time.• INCOM SEQ TRIP!: The SPM has tripped the motor due to an incomplete sequence fault. The source of thefault should be located before the motor is restarted.• PULL-OUT TRIP!: The SPM has tripped the motor due to pull-out.• FIELD OVERTEMP!: The SPM has tripped the motor due to overtemperature on the field windings.• FAIL TO RESYNC!: The SPM has tripped the motor due to a failure to resynchronize.• START INHIBITED! Ready in xxx min.: The SPM has tripped the motor and will not allow a restart attempt forxxx minutes.