Dcma Outputs - GE C70 Instruction Manual

5 SETTINGS

PATH: SETTINGS TRANSDUCER I/O
 DCMA OUTPUT F1

MESSAGE
MESSAGE
MESSAGE
Hardware and software is provided to generate dcmA signals that allow interfacing with external equipment. Specific hard-
ware details are contained in chapter 3. The dcmA output channels are arranged in a manner similar to transducer input or
CT and VT channels. The user configures individual channels with the settings shown below.
The channels are arranged in sub-modules of two channels, numbered 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 manner 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.
Both the output range and a signal driving a given output are user-programmable via the following settings menu (an exam-
ple for channel M5 is shown).
The relay checks the driving signal (x in equations below) for the minimum and maximum limits, and subsequently re-
scales so the limits defined as
ing equation is applied:
where: x is a driving signal specified by the
I and I are defined by the
min max
k is a scaling constant calculated as:
The feature is intentionally inhibited if the
< 0.1 pu. The resulting characteristic is illustrated in the following figure.
VAL
GE Multilin
 

DCMA OUTPUTS

DCMA OUTPUT F1
SOURCE: Off
DCMA OUTPUT F1
RANGE: –1 to 1 mA
DCMA OUTPUT F1
MIN VAL: 0.000 pu
DCMA OUTPUT F1
MAX VAL: 1.000 pu
and match the output range of the hardware defined as
MIN VAL MAX VAL

I if x
 MIN VAL
min


I if x
I
 MAX VAL
=
max
out


k x
 MIN VAL
–
setting
SOURCE
setting
RANGE
I
max
------------------------------------------------ -
k
=
MAX VAL
and
MAX VAL MIN VAL
I
max
I
min
DRIVING SIGNAL
MIN VAL
Figure 5–119: DCMA OUTPUT CHARACTERISTIC
C70 Capacitor Bank Protection and Control System
5.9 TRANSDUCER INPUTS AND OUTPUTS
DCMA OUTPUT F1(U8)
Range: Off, any analog actual value parameter
Range: –1 to 1 mA, 0 to 1 mA, 4 to 20 mA
Range: –90.000 to 90.000 pu in steps of 0.001
Range: –90.000 to 90.000 pu in steps of 0.001

I otherwise
+
min
I
–
min
MIN VAL
–
settings are entered incorrectly, e.g. when
MAX VAL
842739A1.CDR
5.9.3 DCMA OUTPUTS
5
. The follow-
RANGE
(EQ 5.25)
(EQ 5.26)
–
MAX VAL MIN
5-251