Transducer Inputs/Outputs; Dcma Inputs; Rtd Inputs - GE c60 Instruction Manual

TRANSDUCER INPUTS/OUTPUTS

5.10 Transducer inputs/outputs

5.10.1 DCmA inputs

SETTINGS  TRANSDUCER I/O  DCMA INPUTS  DCMA INPUT H1(W8)
 DCMA INPUT H1

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.
5
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.
The channels are arranged in sub-modules of two channels, numbered from 1 through 8 from top to bottom. On power-up,
the relay automatically generates configuration settings for every channel, based on the order code, in the same general
manner that is used for CTs and VTs. Each channel is assigned a slot letter followed by the row number, 1 through 8
inclusive, which is used as the channel number. The relay generates an actual value for each available input channel.
Settings are generated automatically for every channel available in the specific relay as shown above for the first channel
of a type 5F transducer module installed in slot H.
The function of the channel can be "Enabled" or "Disabled." If "Disabled," no actual values are created for the channel. An
alphanumeric "ID" is assigned to each channel; this ID is included in the channel actual value, along with the programmed
units associated with the parameter measured by the transducer, such as volts, °C, megawatts, and so on. This ID is also
used to reference the channel as the input parameter to features designed to measure this type of parameter. The
setting specifies the mA DC range of the transducer connected to the input channel.
INPUT H1 RANGE
The
DCMA INPUT H1 MIN VALUE
primary units. For example, a temperature transducer might have a span from 0 to 250 °C; in this case the
value is "0" and the
MIN VALUE
from –20 to +180 MW; in this case the
"180." Intermediate values between the minimum and maximum values are scaled linearly.

5.10.2 RTD inputs

SETTINGS  TRANSDUCER I/O  RTD INPUTS  RTD INPUT H1(W8)
 RTD INPUT H1

5-274
DCMA INPUT H1

FUNCTION: Disabled
DCMA INPUT H1 ID:

DCMA Ip 1
DCMA INPUT H1

UNITS: A
DCMA INPUT H1

RANGE: 0 to -1 mA
DCMA INPUT H1 MIN

VALUE: 0.000
DCMA INPUT H1 MAX

VALUE: 0.000
and
DCMA INPUT H1 MAX VALUE
value is "250." Another example is a watts transducer with a span
DCMA INPUT H1 MAX VALUE
DCMA INPUT H1 MIN VALUE
RTD INPUT H1

FUNCTION: Disabled
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
settings are used to program the span of the transducer in
value is "–20" and the
DCMA INPUT H1 MAX VALUE
Range: Disabled, Enabled
C60 BREAKER PROTECTION SYSTEM – INSTRUCTION MANUAL
CHAPTER 5: SETTINGS
DCMA
DCMA INPUT H1
value is