Danaher Motion SuperDrive ACS24 Series, Руководство пользователя

Страница: 64 / 99

Configuration & control of the AC SuperDrive
26.04.2005
Figure 31. Examples of motor phase current (red) and voltage between phase and B- (blue) at
- low speed and no over modulation (left figure)
- high speed and over modulation (right figure)
6.13 O
PEN DRAIN OUTPUT CONTROL
Two open drain outputs are available in K1 (Pin 2 and Pin 10). Each output can be either in Main
Contactor mode or General Output mode and the mode is controlled with the parameter Open
Drain Output 1 Mode and Open Drain Output 2 Mode.
In Main Contactor mode, the output is enabled when the ACS is switched on (bit 1 in the Status
Word). In General Output mode, the output is controlled through the bit 6 (Open drain output 1
on) and bit 7 (Open drain ouput 2 on) in the Command Word. The Open Drain Outputs are
voltage controlled in both modes and the voltage is defined as the voltage between B+ and Pin 2
in K1. In order to realize the commanded voltage PWM is used. The switching frequency is by
default equal to 1 kHz but can be choosen also as 2, 4, 8 or 16 kHz.
The Open Drain Output voltage is implemented as shown in Figure 32 . The Output can be set up
for a Pull Voltage when the output is enabled and a Hold Voltage that follows upon the Pull
Voltage. The control of the function runs with 500 Hz, which means that the smallest Pull Time is
2 ms. If any time is set to zero that part of the output is removed. For example if the Pull Time is
set to zero, no Pull Voltage will be generated.
Figure 32. Open drain output functionality.
Item No.
89Y05120A
User's Guide 1.0
64