Precision Digital PD650 - Manual (Page 49)

Model PD650 Large Display Process Meter Instruction Manual
49
Assigning Set Points to Process/Rate or Total (setup)
The optional relays can be assigned to respond to the process/rate or the
accumulated total using the setup function. Process/rate relays may be set for
latching or non-latching operation. Total relays may be programmed for manual
or automatic reset after a programmable delay on release has elapsed. Delay on
release is available when internal total reset is selected. The internal total reset
function is applied to the highest programmed preset value.
The Setup menu is used to program the following:
1. Selecting a set point for process/rate or total
Any set point can be set up so it responds to the process/rate or total
display.
2. Latching or non-latching relay action for process/rate set points
Any process/rate set point can be set up so it functions as a latching or non-
latching relay. In latching mode, the relay must be reset via the front panel
ACK button or an external switch wired across terminals AK and CM at J1
connector on the Main Board.
3. Internal or external total reset effect on total relays
If internal total reset is selected, the total resets to zero when the highest
preset value is reached. All relays assigned to total will automatically reset
after the delay on release elapses, allowing a new batch to begin.
If external total reset is selected, relays must be reset manually. Total relays
also reset when total is reset to zero.
4. Preset offset for total set points
Relays that are assigned to total can be programmed to trip at any point
below the next relay’s preset value. If preset offset mode is selected the
corresponding relay will always trip at a programmed offset value before the
next relay trips. When an offset value is being programmed, the
corresponding status LED flashes.
Example: Set point 1 and 2 are set up for total, with offset selected (under
set point 2). If the preset offset is set at 10, (during set points programming
for set point 1), then relay 1 will trip 10 counts before relay 2.
5. Program delay on release from 1 to 999 seconds if internal total reset has
been selected.
If internal total reset is selected, the total is automatically reset to zero when
the highest preset is reached, then a delay will occur before all total relays
reset automatically. The delay can be programmed anywhere from 1 to 999
seconds. Once the delay has started, the ACK button becomes inoperative
for all total relays until the delay has elapsed.
6. Setup process/rate relays for pump alternation control.
A pair of relays can be set up to alternate every time an on/off pump cycle is
completed. Set points and reset points can be programmed, so that first
pump on is the first pump off.