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7 TESTING AND TROUBLESHOOTING
7.2 DISPLAY AND MESSAGES
The SPM uses the alphanumeric display to indicate the following information:
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programming prompts
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SPM trip explanations
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readout of the desired motor running parameters
The motor running parameters are displayed as follows.
Before start, the SPM displays SPM READY.
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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 normal
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running 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.
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Once the motor has synchronized, the SPM displays power factor, line current, field volts (if optioned), field
current (if optioned), and field ohms (if optioned).
The SPM has a number of built-in messages that may appear during normal operation or if an error is
detected. Errors may occur because the CPU detects a problem internal to the SPM. These messages are
explained in detail below.
FIELD IS APPLIED: This message appears when the SPM has closed the field contactor. It is displayed briefly
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and is a normal SPM function.
PWR FACTOR TRIP: The motor has been operating below the power factor setpoint too long causing a trip.
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CHECK EXCITER: The field voltage is below the minimum entered in the field undervoltage setpoint. The
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exciter 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.
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FIELD LOSS TRIP!: The field current is less than the field current setpoint. The exciter should be checked for
proper output and the field current setpoint should be checked.
MISSING VOLTAGE!: The SPM is NOT receiving a power factor reference voltage input to terminals V
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and PF REF is set to External.
and V
2EXT
SQL CAGE TRIP!: The SPM has tripped the motor off-line due to a squirrel cage protection trip. The motor
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must 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-
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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 the
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fault should be located before the motor is restarted.
PULL-OUT TRIP!: The SPM has tripped the motor due to pull-out.
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FIELD OVERTEMP!: The SPM has tripped the motor due to overtemperature on the field windings.
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FAIL TO RESYNC!: The SPM has tripped the motor due to a failure to resynchronize.
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START INHIBITED! Ready in xxx min.: The SPM has tripped the motor and will not allow a restart attempt for
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xxx minutes.
GE Multilin
Courtesy of store.ips.us
SPM Synchronous Motor Protection and Control
7.2 DISPLAY AND MESSAGES
7.2.1 DISPLAY
7.2.2 SPM MESSAGES
7
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