6
SPECIAL FUNCTIONS
One of the digital inputs from DI3 to DI10 can select between manual and automatic PID operation (P0265 a
P0272).
When the PID regulator function is activated (P0203 = 1 or 3), the digital input DI3 is automatically programmed
for the Manual/Automatic function (P0265 = 15):
Table 6.1: DIx operation mode
DIx
Action type
0 (0 V)
Manual
1 (24 V)
Automatic
P0040 indicates the process variable value (feedback) in the selected scale and unit. In order to avoid the feedback
analog input saturation during the regulation overshoot, the signal must vary between 0 and 9.0 V (0(4) to 18 mA).
The adaptation between the setpoint and the feedback can be done changing the gain of the analog input selected
as feedback (P0238 for AI2 or P0242 for AI3). The Process variable can also be visualized at the outputs AO1 to
AO6, provided that programmed at P0251, P0253, P0255, P0257, P0259 and P0261. This is also valid for the
PID setpoint.
The outputs DO1, DO2 and RL1 to RL5 can be programmed (P0275 to P0277, P0279 to P0282) for the functions
Process Variable > VPx (P0533)” and Process Variable < VPy (P0534)”.
The functions JOG and Forward/Reverse remain disabled. Enable and Start/Stop commands are defined at P0220,
P0224 and P0227.
If the setpoint is defined by P0525 (P0221 or P0222 = 0), and the system is changed from manual to automatic,
then P0525 is automatically adjusted with the P0040 value. In this case the transition from manual to automatic is
smooth (there is no sudden speed variation).
MVW3000 | 6-2
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