PD6720 Field-Mount Loop-Powered Rate/Totalizer
Instruction Manual
19
Alarm & Pulse Output (
OUTPUT
)
The PD6720 is equipped with an NPN open collector
output that may be set up for high or low rate alarm
trip point, total alarm trip point, or pulse output based
on K-factor. The pulse output frequency may be
programmed for 2, 4, 8, 16, 32, 64, or 128 Hz.
The output may be disabled by selecting
off
. When
alarm indication is enabled, the HI and LO symbols
are used accompanied by a flashing display. The
alarm status will show on the display even if the
output is not wired.
Alarm Output (
alrm
)
•
Rate high alarm trip point:
program set point
above reset point.
•
Rate low alarm trip point:
program set point
below reset point.
•
Rate alarm deadband is determined by the
difference between set and reset points.
Minimum deadband is one display count. If set
and reset points are programmed the same,
output will reset one count below set point.
•
Total alarm trip point:
program total set point.
Alarm reset is triggered by total reset (There is no
reset parameter entered for total). If automatic
total reset is enabled, this setting will be the
trigger point for the timer.
It is not necessary to
have the output wired for automatic reset function
to work.
To acknowledge an alarm, press the
Enter
button
once for acknowledge prompt and a second time
to confirm.
Pulse Output Scaler (
count
)
The pulse output scaler (count) corresponds to the
total units (e.g. gallons) needed to generate one
pulse. For example, if the pulse output scaler (count)
value is set to 10; one pulse is generated for every 10
counts incremented on the display.
If the pulse output exceeds the programmed output
frequency, pulses are accumulated as pending.
Pulses will continue to output until the buffer is
emptied or the total is reset from the front panel.
