GE 750 Instruction Manual page 180

750/760
Feeder Management Relay
Analog Input
ANALOG INPUT
ANALOG INPUT
SETUP
5–84
a) Main Menu
PATH: SETPOINTS S6 MONITORING
[ ]
MESSAGE
MESSAGE
MESSAGE
MESSAGE
The relay can monitor any external quantity, such as transformer winding
temperature, bus voltage, battery voltage, station service voltage, transformer tap
position, etc., via an auxiliary current input called the analog input. Any one of the
standard transducer output ranges 0 to 1 mA, 0 to 5 mA, 0 to 10 mA, 0 to 20 mA, or
4 to 20 mA can be connected to the analog input terminals.
Two independent elements are available for monitoring the analog input level,
Analog Threshold 1 and 2, each having a user programmable name, pickup level,
drop out ratio, and a time delay. For each element, when the measured analog input
quantity exceeds the pickup level for longer than the associated time delay, the
relay can be configured to cause a trip, an alarm, or signal an output contact. The
element will drop out only when the user programmed drop out ratio has been met.
There are also two elements which measure the analog input rate-of-change,
Analog In Rate 1 and 2, which operate in a similar fashion.
b) Analog Input Setup
PATH: SETPOINTS S6 MONITORING
[ ] A/I NAME:
ANALOG INPUT
A/I UNITS:
MESSAGE
μ
A
A/I RANGE:
MESSAGE
0-20 mA
A/I MIN
MESSAGE
VALUE:
A/I MAX
MESSAGE
VALUE: 20000
Before the analog input can be used for monitoring, the value of the input must be
converted to the quantity that is being measured. The relay simplifies this process
by internally scaling the transducer output, and displaying and monitoring the actual
measured parameter. Note the resolution that will result from the selection of the
minimum and maximum setpoints. For example, if 0 to 20 mA is to be represented
via the 0 to 20 mA analog input, an input of 4.5 mA will translate to a 5 mA actual
value reading. This is due to the rounding up of the value, since the analog input
actual value is an F1 format. If a range of 0 to 200 mA was programmed to be
represented via the 0 to 20 mA input, 4.5 mA will result in a 45 mA actual value.
For the and
A/I MIN VALUE A/I MAX VALUE
to the minimum/maximum output value of the transducer. For example, if a
temperature transducer which outputs 4 to 20 mA for temperatures 0 to 250°C is
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ANALOG INPUT
ANALOG INPUT [ ]
See page 5–84.
SETUP
ANALOG [ ]
See page 5–85.
THRESHOLD 1
ANALOG [ ]
See page 5–85.
THRESHOLD 2
ANALOG INPUT [ ]
See page 5–86.
RATE 1
ANALOG INPUT [ ]
See page 5–86.
RATE 2
ANALOG INPUT ANALOG INPUT SETUP
Range: Any
Range: Any
Range: 0-1 mA, 0-5 mA, 4-20 mA, 0-20
Range: 0 to 65535 units in steps of 1.
μ
0 A
Range: 0 to 65535 units in steps of 1.
μ
A
setpoints, enter the value which corresponds
S6 Monitoring
combination of 20
alphanumeric characters
combination of 6
alphanumeric characters.
mA, 0-10 mA
GE Multilin