Ramp & Dwell - Brainchild BTC-2500 User Manual

5 6 Ramp & Dwell 5 6 Ramp & Dwell
Example 1: Temperature cycling Chamber Example 1: Temperature cycling Chamber
A chamber is used to test the temperature cycling effect on the personal A chamber is used to test the temperature cycling effect on the personal
computers. An external cycle timer is used to control the event input for computers. An external cycle timer is used to control the event input for
switching the set point. The products under test are required to stay at 60 C switching the set point. The products under test are required to stay at 60 C
for 1 hour and -10 C for 30 minutes. The transition interval between high-low for 1 hour and -10 C for 30 minutes. The transition interval between high-low
temperature is required to be 5 minutes. Make the following setup: temperature is required to be 5 minutes. Make the following setup:
EIFN=SP .P2 EIFN=SP .P2
A1FN=TIMR A1FN=TIMR
OUT1=REVR, Relay Output OUT1=REVR, Relay Output
OUT2=COOL, 4-20mA Output OUT2=COOL, 4-20mA Output
SPMD=MINR SPMD=MINR
IN1U= C IN1U= C
DP1=1-DP DP1=1-DP
The circuit diagram and its temperature profile are shown below: The circuit diagram and its temperature profile are shown below:
Chamber
1 1
Mains Mains
TIME=60.0 (minutes ) TIME=60.0 (minutes )
SP1=60.0 C SP1=60.0 C
SP2=-10.0 C SP2=-10.0 C
CPB=100 (%) CPB=100 (%)
RAMP=14.0 ( C/minute ) RAMP=14.0 ( C/minute )
90
Freezer
Heater
3 3 AC AC
Inverter
+
1 2 3 4 5 6 7
8 9 10 11 12 13 14
RTD
5V DC 5V DC
Relay Relay
ON
65
OFF
35
Cycle Timer Cycle Timer
UM25001C
Figure 5.8 Figure 5.8
A Temperature Cycling Chamber A Temperature Cycling Chamber