Good day all. Trying to get my head around the scaling blocks. The application is a PI loop for pump control vs pressure. I am aware that in PI mode the scaling blocks' o/p spans are set by the PI ref and feedback limits (460-463).
I'd like to have the HIM speed command read 0.0 to 10.0 for the pressure in bar and then scale analogue i/p 2 (feedback from 4-20mA transducer) to display 0-10(bar) in say, the bus voltage field (the 3rd numeric display). I'm using the HIM as the PI setpoint input via port 2. So far I've got the paras set to:
80: 0
90: 19 Speed ref A = HIM
125: Bit 0 set; PID enabled
126: 25 PI ref = scale 1 out
128: 26 PI feedback = scale 2 out
477: 10 Scale 1 in hi
478: 0 Scale 1 in lo
460: 50(Hz?) PI ref hi
461: 0 PI ref lo
462: ??? PI feedback hi
463: 0 PI feedback lo
Are the display units programmable to show eng units like bar, etc? The idea is to control for pressure, not Hz or rpm.
Thanks.
I'd like to have the HIM speed command read 0.0 to 10.0 for the pressure in bar and then scale analogue i/p 2 (feedback from 4-20mA transducer) to display 0-10(bar) in say, the bus voltage field (the 3rd numeric display). I'm using the HIM as the PI setpoint input via port 2. So far I've got the paras set to:
80: 0
90: 19 Speed ref A = HIM
125: Bit 0 set; PID enabled
126: 25 PI ref = scale 1 out
128: 26 PI feedback = scale 2 out
477: 10 Scale 1 in hi
478: 0 Scale 1 in lo
460: 50(Hz?) PI ref hi
461: 0 PI ref lo
462: ??? PI feedback hi
463: 0 PI feedback lo
Are the display units programmable to show eng units like bar, etc? The idea is to control for pressure, not Hz or rpm.
Thanks.
