User's Manual MT440/MT438/MT436 Measuring transducer
Communication ....................................................................................................................... 20
Communication parameters (COM 1) ........................................................................................ 20
Modbus table ............................................................................................................................. 20
USB Communication ................................................................................................................... 21
Service USB Communication ...................................................................................................... 21
Security.................................................................................................................................... 21
Password-Level 0 >PL0) .............................................................................................................. 21
Password-Level 1 >PL1) .............................................................................................................. 21
Password-Level 2 >PL2) .............................................................................................................. 21
A Backup Password->BP) ............................................................................................................ 21
Password locks time >min) ......................................................................................................... 22
Password setting ........................................................................................................................ 22
Password modification ............................................................................................................... 22
Password disabling ..................................................................................................................... 22
Energy ..................................................................................................................................... 22
Active tariff ................................................................................................................................. 22
Common energy exponent ......................................................................................................... 22
Counter divider ........................................................................................................................... 22
Inputs and outputs .................................................................................................................. 23
Analogue output module............................................................................................................ 23
Fast analogue output module .................................................................................................... 24
Relay output module .................................................................................................................. 25
Alarms ..................................................................................................................................... 26
Alarms setting ............................................................................................................................. 26
Reset........................................................................................................................................ 26
Reset energy counters (E1, E2, E3, E4) ....................................................................................... 26
Reset MD values ......................................................................................................................... 26
Reset the last MD period ............................................................................................................ 26
Reset alarm output ..................................................................................................................... 26
MEASUREMENTS ......................................................................................................... 27
Measurements (online) ........................................................................................................... 27
Available connections ............................................................................................................. 27
Survey of supported measurements regarding connection mode ......................................... 28
Explanation of basic concepts ................................................................................................. 30
Sample factor Mv ....................................................................................................................... 30
Average interval Mp ................................................................................................................... 30
Power & energy flow .................................................................................................................. 30
Calculation and display of measurements .............................................................................. 30
Present values ......................................................................................................................... 31
Voltage........................................................................................................................................ 31
Current ....................................................................................................................................... 31
Active, reactive and apparent power ......................................................................................... 31
Power factor and power angle ................................................................................................... 32
Frequency ................................................................................................................................... 32
Energy counters .......................................................................................................................... 32
MD values ................................................................................................................................... 33
THD − Total harmonic distortion ................................................................................................ 33
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