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The timer is programmed by using TIME which is contained in Configuration menu. The Timer starts
to count as soon as the process reaches its set point, and triggers an alarm as time out. Here is an
example.
Example without Dwell Timer
Select TIMR for A1FN, IN1U selects F, DP1 selects NODP, Set TIME=30.0 SP1 is set to 400
F initially, and corrected to 200 F before the process reaches 200° F. As the process reaches set
point (i.e. 200°F) the timer starts to count. The TIME value can still be corrected without disturbing
the Timer before time out. The TIME is changed to 40.0 after 28 minutes since the process reached
its set point. The behavior of process value and alarm 1 are shown below.
Once the timer output was energized it will remain unchanged until power down or an event
input programmed for resetting alarm is applied.
Figure 4-49.Dwell Timer
Note: The TIMR can't be chosen for both A1FN and A2FN simultaneously; otherwise an error
code will produce.
Ramp &Dwell
A Ramp can be accompanied with a dwell timer to control the process. Here is an example.
Example Ramp & Dwell Timer
Select HRR for SPMD, IN1U selects PU, DP1 select 2-DP, Set RAMP=60.00 A2FN selects
TIMR, Set TIME=20.0 as power is applied the process value starts from 0.00 and set SP1=30.00,
SP2=40.00. The timer output is used to control event input.
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