Tempco tec-220, Instruction Manual, Page: 18 / 36

14
3–5 Configuring the Display
The TEC-220 can be configured to display the process value by
selecting PV for DISP or to display the set point value by select-
ing SP1 for DISP.
If LOCK is set to NONE, OUT2 is set to DEHI, and DISP is set
to PV, set SEL1=SHIF, SEL2=ADDR. SEL3=PB,
SEL4~SEL8=NONE, then the display scrolling for the TEC-220
will become:
If LOCK is set to NONE, OUT1 is set to REVR, a non-zero value
is set for PB and TI, OUT2 is set to COOL, and DISP is set to
SP1, set SEL1=INPT, SEL2=PB, SEL3=TI, SEL4~SEL8=
NONE, then the display scrolling for the TEC-220 will become:
Example for TEC-920:
Set OUT2=PVLO, LOCK=NONE, SEL1=INPT, SEL2=UNIT,
SEL3=DP, SEL4~SEL8=NONE, then the display scrolling for
the TEC-920 will become:
3–6 Ramp
Ramp
The ramping function is performed during power up as well as
any time the set point is changed. If MINR or HRR is chosen for
RAMP, the unit will perform the ramping function. The ramp rate
is programmed by adjusting RR. The ramping function is dis-
abled as soon as failure mode, manual control mode, auto-tuning
mode or calibration mode is entered.
Example without dwell timer
Select MINR for RAMP, select °C for UNIT, select 1-DP for DP,
set RR=10.0. SV is set to 200°C initially, and changed to 100°C
30 minutes after power-up. The starting temperature is 30°C.
After power-up, the process runs like the curve shown in
Figure 3.5.
Note : When the ramp function is used, the lower display will
show the current ramping value. The ramping value is an artifi-
cially determined setpoint created and updated by the control to
match the ramp rate set by the user. 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 process value
either on power-up or when RR and/or the set point are changed.
Setting RR to zero means no ramp function.
3–7 Dwell Timer
Output 2 can be configured as a dwell timer by selecting TIMR
for OUT2. As the dwell timer is configured, the parameter SP2 is
used for dwell time adjustment. The dwell time is measured in
minutes ranging from 0.1 to 4553.6 minutes. Once the process
reaches the set point the dwell timer starts to count down to zero
(time out). The timer relay will remain unchanged until time out.
The dwell timer operation is shown in the following diagram.
After time out, the dwell timer can be restarted by pressing the
RESET key.
The timer stops counting during manual control mode, failure
mode, the calibration period and the auto-tuning period.
If output 2 is configured as a dwell timer, ALMD will be hidden.