Operation and Configuration
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18
–
Closed contact resistance: > 100 kohm
If these requirements are not observed, the state of the digital input is undefined.
The indicator
STOP
lights if the control is stopped.
6.9
Setpoint limits
The valid range for the setpoint
SP
is limited by the Setpoint limits
SL-L
and
SL-H
.
The Setpoint limits are limited too. They can assume the values only within the measure-
ment range for the selected sensor.
Note:
The parameters
SP
,
SL-L
,
SL-H
,
An-L
,
An-H
can assume the values above 1000°С for
the thermocouples with the upper limit above 1000°C. In this case the value is displayed
on the lower display without decimal part but with the flashing point after the last digit:
[
1 0 0 0 .
].
The flashing point indicates that the number has a decimal part.
To display and to modify the decimal part press the
+
keys, then
[
- - - . 0
]
will be displayed. To modify the decimal part press the
or
keys. To go back
to the integer part press the
+
keys.
6.10
Control modes
The setpoint
SP
should be set as the main control parameter. For further details see 6.9
“Setpoint limits” and 6.10.6 “Setpoint Ramp”.
The control procedure depends on the output type and can be set in the parameters de-
scribed below (see 6.10.1-6.10.6).
6.10.1
Control type
CntL
= Pid
– PID control
CntL
= onoF
– on-off control
Note:
If Control is started, the parameter
CntL
is not available in the menu. The parame-
ter can be only modified when the control process is stopped:
–
in the menu by setting
r-S
= StoP, if the parameter
Ev-1
“DI function” is set to nonE
–
by switching the digital input, if the parameter
Ev-1
“DI function” is set to n-o or n-C
(see 6.8).
6.10.2
Control function
One of the following control functions (
orEU
) can be selected:
orEU
= or-r
– Heating
orEU
= or-d
– Cooling
–
Function “Heating” is used to control the heating process or to generate an alarm
signal if the process value
Pv
is below the setpoint
SP
. The output is activated when
the
Pv
< (
SP
.
–
HYSt
) and deactivated when
Pv
> (
SP
+
HYSt
).
–
Function “Cooling” is used to control the cooling process or to generate an alarm
signal if the process value
Pv
is above the setpoint
SP
. The output is activated when
the
Pv
> (
SP
+
HYSt
) and deactivated when
Pv
< (
SP
–
HYSt
).
6.10.3
“Quickly to SP” mode
This mode enables to reach the setpoint with the maximum speed and minimum over-
shoot. To activate the mode set the
parameter
rAmP
= ON.
Note
: Before activating the mode “Quickly to SP” Autotuning should be carried out (see
7.3).
