GE SPM Series, Instruction Manual

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5-
8
SPM Synchronous Motor Protection & Control GE Power Management
5.2 SETPOINTS MENU 5 SETPOINTS
5
5.2.15 FIELD UNDERCURRENT
FUNCTION:
The value programmed here determines the minimum permissible field current that the SPM recognizes as
valid. If the field current falls below this setpoint, the SPM will trip and display a
FIELD LOSS TRIP fault. A sepa-
rate accessory package (PG2SPM or PG4SPM) is required to utilize this feature.
MOTOR TYPE:
Collector-Ring or Brushless
5.2.16 FIELD UNDERCURRENT DELAY
FUNCTION:
The field undercurrent delay represents the time delay that will elapse after the Field Amps falls below the pro-
grammed setpoint before the SPM initiates tripping action for Field Undercurrent (
FIELD LOSS TRIP
). The Field
Amps Option must be enabled before this feature can be used.
MOTOR TYPE:
Collector-Ring or Brushless
5.2.17 FIELD UNDERVOLTAGE
FUNCTION:
This parameter determines the field undervoltage that will initiate a
CHECK EXCITER
condition. For example, if
the exciter normally provides 100 V to the field circuit and this setpoint is programmed for 30 V, then the SPM
will trip and display
CHECK EXCITER
if the field voltage falls below the setpoint. The SPM checks the exciter volt-
age before allowing the motor to start and will not allow a start if the voltage is not present but, will not require
a reset once voltage is reestablished. The SPM displays
CHECK EXCITER
and initiates a trip anytime the motor is
running and the field voltage is below this setpoint. In this case a reset is required. The exciter output must be
hooked up to the SPM via the included VDN module. See installation for more details.
MOTOR TYPE:
Collector-Ring or Brushless
APPLICATION:
This function is supplied for equipment that has exciters energized prior to starting the motor. If the exciter is
designed to be energized with motor starting (as with shaft connected rotating exciters), use the field current
loss feature instead or a separate voltage relay for voltage check protection.
FIELD AMPS: OFF
ENTER to modify
Collector-Ring: Range: 2 to 2000 A
Step 1
EX FLD AMPS: OFF
ENTER to modify
Brushless: Range: 2 to 2000 A
Step 1
FLD IE DLY: N/A
ENTER to modify
Range: N/A, 0.3 to 5 seconds
Step: 0.1 for values
<
1 second; 1 for values
≥
1 second
FIELD AMPS: OFF
ENTER to modify
Collector-Ring Range: 2 to 2000 A
Step 1
EX FLD AMPS: OFF
ENTER to modify
Brushless Range: 2 to 2000 A
Step 1