Transducer Inputs/Outputs; Dcma Inputs - GE L60 Instruction Manual

5.8 TRANSDUCER INPUTS/OUTPUTS

5.8TRANSDUCER INPUTS/OUTPUTS
PATH: SETTINGS TRANSDUCER I/O

DCMA INPUTS

Hardware and software is provided to receive signals from external transducers and convert these signals into a digital for-
mat for use as required. The relay will accept 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. Specific hardware details are con-
tained 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. The user configures 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 will automatically generate 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 inclu-
5
sive, which is used as the channel number. The relay generates an actual value for each available input channel.
Settings are automatically generated for every channel available in the specific relay as shown below for the first channel of
a type 5F transducer module installed in slot M.
DCMA INPUT M1
The function of the channel may be either "Enabled" or "Disabled." If "Disabled", no actual values are created for the chan-
nel. An alphanumeric "ID" is assigned to each channel; this ID will be included in the channel actual value, along with the
programmed units associated with the parameter measured by the transducer, such as Volt, °C, MegaWatts, etc. This ID is
also used to reference the channel as the input parameter to features designed to measure this type of parameter. The
DCMA INPUT XX RANGE
The
DCMA INPUT XX 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
a span from –20 to +180 MW; in this case the
value "180". Intermediate values between the min and max values are scaled linearly.
VALUE
5-218
DCMA INPUTS
DCMA INPUT H1
DCMA INPUT U8
MESSAGE
DCMA INPUT M1
FUNCTION: Disabled
DCMA INPUT M1 ID:
MESSAGE
DCMA Ip 1
DCMA INPUT M1
MESSAGE
UNITS: μA
DCMA INPUT M1
MESSAGE
RANGE: 0 to -1 mA
DCMA INPUT M1 MIN
MESSAGE
VALUE:
DCMA INPUT M1 MAX
MESSAGE
VALUE:
setting specifies the mA DC range of the transducer connected to the input channel.
and
DCMA INPUT XX MAX VALUE
DCMA INPUT XX MAX VALUE
DCMA INPUT XX MIN VALUE
L60 Line Phase Comparison Relay
↓
↓
Range: Disabled, Enabled
Range: up to 20 alphanumeric characters
Range: 6 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 mA
Range: –9999.999 to +9999.999 in steps of 0.001
0.000
Range: –9999.999 to +9999.999 in steps of 0.001
0.000
settings are used to program the span of the transducer in
value is "250". Another example would be a Watt transducer with
value would be "–20" and the
5 SETTINGS
5.8.1 DCMA INPUTS
DCMA INPUT XX
DCMA INPUT XX MAX
GE Multilin