Loop Leader PD6620 Series Loop-Powered Flow Rate/Totalizers
Instruction Manual
25
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. Pro-
gram 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 func-
tion 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
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 function.
Setup:
Assign the following to
Stopwatch Function
•
Bottom display line
(see pages 21 & 22 for details how to
change the display)
•
Relay 1
(see pages 23 & 26 how to change Open Col-
lector and or Solid State Relay functionality)
•
F3: Start/Stop
(see pages 34 & 35 for details on how to
change the function keys)
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 com-
plete 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
