5
Loop-Powered Process Meter
DPM-400
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Timer Function Application
Application Timers are used in everyday life; one of the most common
examples is the microwave oven. Industrial timers are used in process
control applications where certain events or actions need to be controlled
by time. Examples include automatic and batch control applications,
where the relay needs to be energized for a specific length of time.
The timer fuction is available on the open collector and relay outputs;
which means that you can have up to four timers per meter. The start
and stop actions can be triggered from the setup menu or by the function
keys and digital input. The meter can be setup to display the off/on timer
count down.
There are two modes of operation:
1. Continuous Timer (Interval)
At the start of the timer the output is off and turns on after the
Off Delay elapses. The output remains on for the duration of the
On Time. The cycle repeats until the user stops the timer either from
the menu or a function key.
2. One-Shot Timer
At the start of the timer the output is off and turns on after the
Off Delay elapses. The output remains on for the duration of the
On Time. The timer stops and the cycle does not repeat.
Optional Isolated 4-20 mA Output
The isolated analog output signal can be configured to represent the
process variable (PV1, PV2, or retransmit). While the output is nominally
4-20 mA, the signal will accurately accommodate under- and over-
ranges from 1 to 23 mA. The output can be reverse scaled such that
the meter’s high calibration value outputs 4 mA and the meter’s low
calibration outputs 20 mA.
PUMP CONTROL
DPM-400s, when ordered with the two solid state relays, have several
features that make them ideal for simple duplex pump control. The
relays can be programmed to alternate the pumps based on level and
runtime thus ensuring even wear on both pumps. If the level remains
constant (within on/off points), alternation is based on runtime. If the
level cycles the on/off points, alternation is based on level and runtime.
If the run time is set to 0, alternation is based on level. The meter also
keeps track of runtime for both pumps and the number of times they
have cycled.
Display Pump Runtime & Cycle Count
In addition to the two solid state relays for controlling pumps, the
DPM-400s two open collectors could be used to indicate high or low level
alarm conditions.
Pump Alternation Application
The DPM-400 can be used as a pump controller to alternate two
pumps and provide high and low level alarm indication. The pumps can
be programmed to alternate on level and run time and the meter can
display the pump run times and the number of times they have cycled.
The meter can display the number
of times the relays have cycled
The meter can display pump
runtime for both pumps
a.
A sensor detects the bottle is in place and
triggers the digital input to start the timer
b.
The timer output controls the filling pump
c.
The On Time is set according to the time
needed to fill the bottle
NEw FEATURE:
DPM-400 displays pump runtime and number of cycles.
