Transducer Inputs/Outputs; Dcma Inputs - GE L30 Instruction Manual

CHAPTER 5: SETTINGS
Figure 5-167: Direct inputs/outputs logic (example for L90 shown)

5.10 Transducer inputs/outputs

5.10.1 DCmA inputs

SETTINGS  TRANSDUCER I/O  DCMA INPUTS  DCMA INPUT H1(U8)
 DCMA INPUT H1

The L30 is provided with optional DCmA capability. This feature is specified as an option at the time of ordering.
See the Order Codes section in chapter 2 for details.
Hardware and software are provided to receive signals from external transducers and to convert these signals into a
digital format for use as required. The relay accepts inputs in the range of –1 to +20 mA DC, suitable for use with most
common transducer output ranges; all inputs are assumed to be linear over the complete range. Hardware details are
contained in chapter 3.
Before the DCmA input signal can be used, the value of the signal measured by the relay must be converted to the range
and quantity of the external transducer primary input parameter, such as DC voltage or temperature. The relay simplifies
this process by internally scaling the output from the external transducer and displaying the actual primary parameter.
DCmA input channels are arranged in a manner similar to CT and VT channels. Configure the individual channels with the
settings shown here.
L30 LINE CURRENT DIFFERENTIAL SYSTEM – INSTRUCTION MANUAL
DCMA INPUT H1

FUNCTION: Disabled
DCMA INPUT H1 ID:

DCMA Ip 1
DCMA INPUT H1

UNITS: μA
DCMA INPUT H1

RANGE: 0 to -1 mA
DCMA INPUT H1 MIN

VALUE: 0.000
DCMA INPUT H1 MAX

VALUE: 0.000
TRANSDUCER INPUTS/OUTPUTS
Range: Disabled, Enabled
Range: up to 20 alphanumeric characters
Range: six alphanumeric characters
Range: 0 to –1 mA, 0 to +1 mA, –1 to +1 mA, 0 to 5
mA, 0 to 10mA, 0 to 20 mA, 4 to 20 m
Range: –9999.999 to +9999.999 in steps of 0.001
Range: –9999.999 to +9999.999 in steps of 0.001
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