number of binary inputs are limited to seven, the coding functions are limited
to seven bits including the sign bit and thus the six bits are used in the coding
functions. The position limits for the tap positions at BCD, Gray and Natural binary
coding are ±39, ±63 and ±63 respectively.
In this example, the transformer tap changer position indication is wired as a mA
signal from the corresponding measuring transducer. The position indication is
connected to input 1 (
AI_VAL1
) of the (RTD) module. The tap changer operating
range from the minimum to maximum turns of the tap and a corresponding mA
signal for the tap position are set in the RTD module. Since the values of the
RTD module outputs are floating point numbers, the float to integer (T_R_TO_I8)
conversion is needed before the tap position information can be fed to TPOSYLTC.
When there is a wired connection to the
TAP_POS
connector, the validated tap
changer position is presented in the
TAP_POS
output that is connected to other
functions, for example, OL5ATCC1. When there is no wired connection to the
TAP_POS
connector, the binary inputs are expected to be used for the tap changer
position information.
Figure 822: RTD/analog input configuration example
8.5.6
Signals
8.5.6.1
TPOSYLTC Input signals
Table 1450: TPOSYLTC Input signals
Name
Type
Default
Description
BI0
BOOLEAN
0=False
Binary input 1
BI1
BOOLEAN
0=False
Binary input 2
BI2
BOOLEAN
0=False
Binary input 3
BI3
BOOLEAN
0=False
Binary input 4
BI4
BOOLEAN
0=False
Binary input 5
BI5
BOOLEAN
0=False
Binary input 6
SIGN_BIT
BOOLEAN
0=False
Binary input sign bit
END_POS_R
BOOLEAN
0=False
End position raise or
highest allowed tap
position reached
Table continues on the next page
Measurement functions
1MRS759142 F
1502
REX640
Technical Manual