GE 489 - Manual (Page 127)

GE Multilin 489 Generator Management Relay 4-77
4 SETPOINTS 4.12 S11 ANALOG I/O
4
There are 4 analog inputs (4 to 20 mA, 0 to 20 mA, or 0 to 1 mA) that may be used to monitor transducers such as vibration
monitors, tachometers, pressure transducers, etc. These inputs may be used for alarm and/or tripping purposes. The
inputs are sampled every 50 ms. The level of the analog input is also available over the communications port. With the
489PC program, the level of the transducer may be trended and graphed.
Before the input may be used, it must be configured. A name may be assigned for the input, units may be assigned, and a
minimum and maxi-mum value must be assigned. Also, the trip and alarm features may be blocked until the generator is
online for a specified time delay. If the block time is 0 seconds, there is no block and the trip and alarm features will be
active when the generator is offline or online. If a time is programmed other than 0 seconds, the feature will be disabled
when the generator is offline and also from the time the machine is placed online until the time entered expires. Once the
input is setup, both the trip and alarm features may be configured. In addition to programming a level and time delay, the
PICKUP setpoint may be used to dictate whether the feature picks up when the measured value is over or under the level.
If a vibration transducer is to be used, program the name as "Vibration Monitor", the units as "mm/s", the minimum as "0",
the maximum as "25", and the Block From Online as "0 s". Set the alarm for a reasonable level slightly higher than the nor-
mal vibration level. Program a delay of "3 s" and the pickup as "Over".
ANALOG INPUT1
ALARM: Off
Range: Off, Latched, Unlatched
ASSIGN ALARM
RELAYS (2-5): ---5
Range: Any combination of Relays 2 to 5
ANALOG INPUT1 ALARM
LEVEL: 10 Units
Range: –50000 to 50000 in steps of 1
Units reflect ANALOG INPUT 1 UNITS above
ANALOG INPUT1 ALARM
PICKUP: Over
Range: Over, Under
ANALOG INPUT1 ALARM
DELAY: 0.1 s
Range: 0.1 to 300.0 s in steps of 0.1
ANALOG INPUT1 ALARM
EVENTS: Off
Range: On, Off
ANALOG INPUT1
TRIP: Off
Range: Off, Latched, Unlatched
ASSIGN TRIP
RELAYS (1-4): 1---
Range: Any combination of Relays 1 to 4
ANALOG INPUT1 TRIP
LEVEL: 20 Units
Range: –50000 to 50000 in steps of 1
Units reflect ANALOG INPUT 1 UNITS above
ANALOG INPUT1 TRIP
PICKUP: Over
Range: Over, Under
ANALOG INPUT1 TRIP
DELAY: 0.1 s
Range: 0.1 to 300.0 s in steps of 0.1
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