Analog Inputs - GE 850 Instruction Manual

INPUTS

Analog Inputs

NOTE:
NOTE
4–94
Description
The 8 Series relay can monitor any external quantity from the DcmA transducers such as
vibration, field current, pressure, tap position etc., using 'Analog Inputs'. Any one of the
standard transducer output ranges: 0 to 1 mA, 0 to 5 mA, 0 to 10mA, 0 to 20 mA, or 4 to 20
mA can be connected to the Analog Input terminals. Polarity of these inputs must be
observed for proper operation. The analog input circuitry is isolated as a group with the
analog output circuitry and the RTD circuitry, only one ground reference is used for the
three circuits. Transducers limit this isolation to ±36 V with respect to the 8 Series safety
ground.
Depending upon the order code, the 8 Series relay supports one optional DC analog card.
The analog card has 4 analog inputs and 7 analog outputs. 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 an alarm, or trip. The element will drop out
only when the user programmed Dropout ratio has been met.
The connected analog input is still read and displayed in METERING /ANALOG INPUTS if the
trip function or alarm function is set to "Disabled", and the Analog Input is not Disabled.
Path: Setpoints > Inputs > Analog Inputs > Analog In 1(X) Setup
..\Analog Inputs\Analog Input 1
Item Name
Function
Name
Unit
Range
Min Value
Max Value
Trip Function
Trip Type
Trip Pickup
Trip Dropout Ratio
Trip Pickup Delay
Trip Dropout Delay
Trip Output Relay
Alarm Function
Alarm Type
Alarm Pickup
Alarm Dropout Ratio
Alarm Pickup Delay
Alarm Dropout Delay
Alarm Output Relay
Block
Events
Targets
An Inp 1
Settings
FUNCTION
Range: Disabled, Enabled
Default: Disabled
This setting enables or disables the Analog Input function.
Value Unit
Disabled
AnIp 1
units
0 to 1mA
0
0
Disabled
Over
20 units
5 %
2 s
0 s
Do Not Operate
Disabled
Over
10 units
5 %
2 s
0 s
Do Not Operate
Off
Enabled
Latched
850 FEEDER PROTECTION SYSTEM – INSTRUCTION MANUAL
CHAPTER 4: SETPOINTS