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
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