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4.13 S12 ANALOG I/O
a) FUNCTION
There are 4 analog inputs, 4 to 20 mA, 0 to 20 mA, or 0 to 1 mA as selected. These inputs may be used to
monitor transducers such as vibration monitors, tachometers, pressure transducers, etc. These inputs may be
used for alarm and tripping purposes. The inputs are sampled every 50 ms. The level of the analog input is
also available over the communications port.
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 maximum value may be assigned. Also, the trip and alarm features may be
blocked from start for a specified time delay. If the block time is 0, there is no block and the trip and alarm fea-
tures will be active when the motor is stopped or running. If a time is programmed other than 0, the feature will
be disabled when the motor is stopped and also from the time a start is detected 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.
b) EXAMPLE 1
If a pressure transducer is to be used for a pump application, program the following setpoints:
4
ANALOG INPUT 1/2/3/4 NAME: Pressure
ANALOG INPUT 1/2/3/4 UNITS: PSI
ANALOG INPUT 1/2/3/4 MINIMUM: 0
ANALOG INPUT 1/2/3/4 MAXIMUM: 500
If there is no pressure until the pump is up and running for 5 minutes and pressure builds up, program the ANA-
LOG INPUT 1 BLOCK FROM START as 6 minutes ("360 s"). The alarm may be fed back to a PLC for when pressure
is under 300 PSI. Program a reasonable delay (e.g ANALOG INPUT ALARM 1 DELAY = "3 s") and ANALOG INPUT
ALARM 1 PICKUP as "Under".
c) EXAMPLE 2
If a vibration transducer is to be used, program the following setpoints:
ANALOG INPUT 1/2/3/4 NAME: Vibration
ANALOG INPUT 1/2/3/4 UNITS: mm/s
ANALOG INPUT 1/2/3/4 MINIMUM: 0
ANALOG INPUT 1/2/3/4 MAXIMUM: 25
Program ANALOG INPUT 1/2/3/4 BLOCK FROM START as "0" minutes. Set the alarm for a reasonable level slightly
higher than the normal vibration level. Program a delay of "3 s" and a pickup value of "Over".
4-80
469 Motor Management Relay
4 SETPOINT PROGRAMMING
GE Power Management
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