Transducer I/O 5.8.1 Dcma Inputs - GE C60 Instruction Manual

5 SETTINGS
5.8 TRANSDUCER I/O
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PATH: SETTINGS TRANSDUCER I/O
# DCMA INPUTS
#
MESSAGE
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 the HARDWARE chapter.
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-
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
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MESSAGE
MESSAGE
MESSAGE
MESSAGE
MESSAGE
The function of the channel may be either "Enabled" or "Disabled." If Disabled, there will not be an actual value created for
the channel. An alphanumeric "ID" is assigned to the channel - this ID will be included in the display of 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 RANGE setting is used to select the specific mA DC range of the transducer connected to the input
channel.
The MIN VALUE and MAX VALUE settings are used to program the span of the transducer in primary units. For example, a
temperature transducer might have a span from 0 to 250°C; in this case the MIN value would be 0 and the MAX value 250.
Another example would be a Watt transducer with a span from –20 to +180 MW; in this case the MIN value would be –20
and the MAX value 180. Intermediate values between the MIN and MAX are scaled linearly.
GE Multilin
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DCMA INPUTS
# DCMA INPUT H1
#
↓
↓
# DCMA INPUT U8
#
DCMA INPUT M1
FUNCTION: Disabled
DCMA INPUT M1 ID:
DCMA Ip 1
DCMA INPUT M1
UNITS: µA
DCMA INPUT M1
RANGE: 0 to -1 mA
DCMA INPUT M1 MIN
VALUE: 0.000
DCMA INPUT M1 MAX
VALUE: 0.000
C60 Breaker Management Relay
5.8 TRANSDUCER I/O
5.8.1 DCMA INPUTS
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 10 mA, 0 to 20 mA, 4 to 20 mA
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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