WEG ECW500, Руководство пользователя

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Functional Description .
36 | ECW500
NOTE!
The factory default password is 2.
6.2 DIGITAL INPUTS
The ECW500 has eleven (11) specific isolated digital inputs that allow full control of the equipment through this
physical interface.
The initial logical status of the digital inputs is zero (off), and for a digital input switches to logic state one (on) it
requires that a voltage between 8 Vdc and 30 Vdc be applied.
There is no polarity in the connection of the digital inputs.
There are three operating modes for the digital inputs:
■
Pressed Button Mode: In this operating mode, the state of the digital input is switched from OFF to ON when
a voltage is applied to the digital input terminals, checking the leading edge of the pulse. Once activated, this
digital input has no longer effect until the function is switched by its complementary input.
Figure 6.9 Transition necessary at the digital inputs on the Pressed Button Mode
■
Released Button Mode: In this operating mode, the status of the digital input is switched from OFF to ON
when a voltage is applied to the digital input terminal and then removed, i.e., in the falling edge of the pulse.
Just applying the voltage to the digital input without removing it has no effect. Once activated, this digital
input has no longer effect until the function is switched by its complementary input.
Figure 6.10 Transition necessary at the digital inputs on the Released Button Mode
■ Maintained Button Mode: In this operating mode of the digital input, the pair functions ON/OFF,
MTVC/MECC, ENABLE PARALLEL/DISABLE PARALLEL, ENABLE ONLINE/DISABLE ONLINE work with
complementary command. Both digital inputs of each pair must be configured for Maintained Button mode;
otherwise, a fault warning will be generated. The pair digital inputs in the maintained button mode must never
be at the same logical level, i.e., when one has voltage applied, its pair must have voltage zero at its
terminals. For example, in order to enable the ECW500, a voltage must be applied simultaneously according
to specification to the digital input ON and zero volts to the digital input OFF. If a voltage is applied to both
inputs or zero volt is applied to the two digital inputs, a fault warning will be generated.