Ramp & Dwell - Brainchild BTC-2500 User Manual

4 4 Ramp & Dwell 4 4 Ramp & Dwell
Ramp
The ramping function is performed during power up as well as any time the set The ramping function is performed during power up as well as any time the set
point is changed. Choose MINR or HRR for SPMD, the unit will perform the point is changed. Choose MINR or HRR for SPMD, the unit will perform the
ramping function. The ramp rate is programmed by using RAMP which is ramping function. The ramp rate is programmed by using RAMP which is
contained in user menu. contained in user menu.
Example without Dwell Timer Example without Dwell Timer
Select MINR for SPMD, IN1U selects C, DP1 selects 1-DP , Set RAMP=10.0. Select MINR for SPMD, IN1U selects C, DP1 selects 1-DP , Set RAMP=10.0.
SP1 is set to 200 C initially, and changed to 100 C after 30 minutes since SP1 is set to 200 C initially, and changed to 100 C after 30 minutes since
power up. The starting temperature is 30 C. After power up the process is power up. The starting temperature is 30 C. After power up the process is
running like the curve shown below: running like the curve shown below:
PV
200 200
C C
100 100
C C
30 30
C C
0 17
Note: When the ramp function is used, the lower display will show the current Note: When the ramp function is used, the lower display will show the current
ramping value. However it will revert to show the set point value as soon as the ramping value. However it will revert to show the set point value as soon as the
up or down key is touched for adjustment. The ramping value is initiated to up or down key is touched for adjustment. The ramping value is initiated to
process value either power up or RAMP and /or set point are changed. Setting process value either power up or RAMP and /or set point are changed. Setting
RAMP to zero means no ramp function at all. RAMP to zero means no ramp function at all.
Dwell
The Dwell timer can be used separately or accompanied with a Ramp. If A1FN The Dwell timer can be used separately or accompanied with a Ramp. If A1FN
selects TIMR, the alarm 1 will act as a dwell timer. Similarly, alarm 2 will act as selects TIMR, the alarm 1 will act as a dwell timer. Similarly, alarm 2 will act as
a dwell timer if A2FN selects TIMR. The timer is programmed by using TIME a dwell timer if A2FN selects TIMR. The timer is programmed by using TIME
which is contained in user menu. The Timer starts to count as soon as the which is contained in user 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 process reaches its set point, and triggers an alarm as time out. Here is an
example. example.
Example without Ramp Example without Ramp
Select TIMR for A1FN, IN1U selects F, DP1 selects NODP , Set TIME=30.0 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 SP1 is set to 400 F initially, and corrected to 200 F before the process
reaches 200 F. As the process reaches set point ( ie. 200 F ) the timer starts reaches 200 F. As the process reaches set point ( ie. 200 F ) the timer starts
to count. The TIME value can still be corrected without disturbing the Timer 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 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 process reached its set point. The behavior of process value and alarm 1 are
shown below. shown below.
SP1 changed to 200 F SP1 changed to 200 F
minutes minutes
Alarm 1 OFF Alarm 1 OFF
30 40
PV reaches set point PV reaches set point
TIME changed to 40.0 TIME changed to 40.0
28 28
PV
Alarm 1 ON Alarm 1 ON
40 40
minutes minutes
Time Time
(minutes) (minutes)
200 F 200 F
Time (minutes) Time (minutes)
UM25001C
SPMD Choose SPMD Choose
Unit / minute Unit / minute
or
Unit / hour Unit / hour
Adjust
RAMP
Figure 4.1 RAMP Function Figure 4.1 RAMP Function
A1FN or A2FN Choose A1FN or A2FN Choose
TIMER
Adjust
TIME
Figure 4.2 Dwell Timer Figure 4.2 Dwell Timer
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