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1.3 Models
Two Models are available:
CN616TC1 - Standard Range Thermocouple
CN616TC2 - Extended Range Thermocouple
1.4 Overview of operation
On power up the controller enters one of three run modes determined by
model configuration (function [71] 33)
Mode 1
[00]
Standard Control
Mode 2
[51]
Ramp & Soak 1 - end power off
Mode 3
[52]
Ramp & Soak 2 - end run last setpoint
Each zone runs as an independent controller, except for PID parameters,
(proportional band, reset and rate) and output cycle time which are
common to all zones. In on/off mode hysteresis is common to all zones.
Any zone can be disabled or set to run under PID control or on/off
control (heating or cooling) independent of other zones. If all zones are
disabled, zone 1 will be enabled by default.
Each zone can be setup to run as a standard control, set independently
with function [36], or as a profile of up to 20 segments set by functions
[01] to [20].
To run a standard control, set the number of segments (function [74]) for
that zone to 0.
To run any zone in PID control mode set the PID zone enable function
[43]. To disable any zone use function [31].
Alarms
The CN616 has 4 alarm options set by model select function [33].
0.
Overheat Alarm
1.
Underheat Alarm
2.
Hi - Lo Alarm
3.
No Alarm
Overheat or Hi alarm is triggered by temperature going over the
setpoint beyond boundary set by the hi alarm setpoint. To trigger the
3
alarm the temperature must stay in alarm condition for a few
seconds. This is to prevent a false alarm.
Underheat or Lo alarm is disabled until enabled zone reach and stay
over the setpoint for a set time. This is to prevent alarm when starting
from cold. When Lo alarm is enabled it will be triggered only when
confirmed over time same as Hi alarm.
Hi - Lo works the same as Overheat and Underheat alarms.
No Alarm disables both Hi and Lo alarms.
When any zone goes into an alarm condition zone scan lock is disabled,
and when the alarm zone is displayed the temperature display will flash.
Hi alarm is indicated by flashing left function digit while Lo alarm is
indicated by flashing right function digit. In case of latching alarm, Hi
alarm takes precedence and Hi alarm will show even if both alarms are
latched.
Note! Whenever the “Run” Mode is exited to set or power off all
alarms are reset.
Autotune
The PID control constants that are the same for all zones programmed
for PID Mode. Autotuning can be done on any one zone selected for
the Autotuning. The system parameters are measured during autotuning
by supplying full power output to the system until the autotuning setpoint
is reached, then the output power is switched Off allowing the tempera-
ture to overshoot and then drop down freely back to the autotuning
setpoint. Then the power is switched on again until setpoint is crossed.
At that point autotuning is completed, the PID constants are calculated
and stored in memory until the next autotuning or manual changes are
made. For best results the autotuning setpoint should be as close as
possible to the control setpoint. However, since the temperature will
overshoot the autotuning setpoint during the autotune by the full propor-
tional band, Systems that cannot tolerate that temperature should have
autotuning setpoint one proportional band value below the control
setpoint.
Setting of the controller can be entered from run mode, by pressing two
buttons together, that will request password, function [99], unless
password is disabled, then controller will go into function [70], which is
the function select.
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Содержание CN616TC1
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