Loop Leader PD6620 Series Loop-Powered Rate/Totalizer Instruction Manual
32
Timer (
TIMER
)
The timer output may be set to generate the timed pulse only once (
ONESHOT
) or continuously (
CONT
).
The timer output produces a constant width pulse at a constant frequency, if set as continuous timer.
Program the
Off Delay
(
OFF.DLAY
) from 1 second to 99 hours 59 minutes and 59 seconds. This is the
time it takes from selecting
START
to turning on the output and for how long the output is off in continuous
mode.
Program the
On Time
(
ONTIME
) for the active low pulse from 1 second to 99 hours 59 minutes and 59
seconds (pulse width). This is the period of time for which the output will remain on.
Select
Start
(
START
) to begin outputting the constant timed pulse.
Select
Stop
(
STOP
) to end outputting the constant timed pulse.
Function keys or the digital input may be assigned to start and stop timer functions (see the
USER
menu
in
Advanced
).
Stopwatch (
STPWATCH
)
The stopwatch function may be used to manually run and control a process for a specific time interval up
to 99 hrs., 59 min, and 59 seconds. The stopwatch function may be assigned to any open collector. There
are three settings needed to use the function effectively.
1. Assign stopwatch to either top or bottom display line
2. Assign the open collector or relay to control the process (on/off)
3. Assign a function key or digital input to start/stop the stopwatch
Application Example
In order to maintain consistency of a product, it is necessary to take and test samples at different times
throughout the day. The stopwatch function is used to open and close a solenoid valve to know the exact
amount of time needed to complete the desired sample. Once this is determined, the timer function can
be used to automatically take a sample (batch) based on the time determined using the stopwatch func-
tion.
Setup:
Assign the following to
Stopwatch Function
•
Bottom display line
•
Relay 1
•
F3: Start/Stop
Procedure
•
Press F3 to start the stopwatch; relay 1 turns on and the process starts running.
•
Press F3 to stop the stopwatch; relay 1 turns off and the process stops.
•
The bottom display indicates the time it took to complete the sample.
OUT 1
TIMER
TIMER
OFF.DLAY
TIMER
ON TIME
TIMER
MODE
TIMER
START
MODE
CONT
MODE
ONE.SHOT
H.MM.SS
00.01.00
H.MM.SS
00.00.01
TIMER
STOP
