Controller functions
RES-445
Page 35
suited to this application (
!
modifications“ auf Seite 6).
It not only facilitates SET-ACTUAL comparisons, but
also enables other criteria such as the heating rate, set
point reached within the specified time, cooling of the
heatsealing band etc. to be evaluated.
This meter moreover permits disturbances in the
control loop (loose connections, contacting or wiring
problems) as well as any line disturbances to be
observed extremely effectively and interpreted
accordingly. The same applies if mutual interference
occurs between several neighboring control loops.
If an alarm is signaled, this analog output is used – in
addition to the value indicated on the controller – to
display a selective error message (
!
messages“ auf Seite 49).
If you want a fixed 10V reference voltage to appear at
the analog output (terminal 24), you can configure this
in the Configuration menu, step 33 (analog output):
• Actual temperature (•)
The actual value output indicates the current
ACTUAL value as a 0…10VDC analog voltage.
• 10V reference
(This setting is possible as of software revision 017)
A fixed 10VDC reference voltage is output at the
actual value output.
10.8
Automatic zero calibration
(AUTOCAL)
Owing to the automatic zero calibration (AUTOCAL)
function, there is no need to adjust the zero point
manually on the controller. The "AUTOCAL" function
matches the controller to the current and voltage
signals that are present in the system. This function can
be activated in two ways:
• By means of a 24VDC signal at terminals 20+25.
• By selecting step 7 in the Settings menu and
pressing the "ENTER" key
The initial temperature (ambient temperature) of the
heatsealing bar(s) which is currently valid for calibration
can be set beforehand in the 0…40°C range using the
"UP" and "DOWN" keys.
The zero point is calibrated in the factory to 20°C.
The automatic calibration process takes around
10…15 seconds. The heatsealing band is not heated
until the calibration process has finished.
The message "- Calibration - Please wait..." appears
on the display while the "AUTOCAL" function is
executing and a counter counts down from 13 to 0. The
actual value output (terminals 20+24) is set to 0°C
(corresponds to 0VDC) for the duration of the
calibration process.
(•) Factory setting
RES-445
max. 6mA
25
20
AUTOCAL
+
-
GND
24VDC
AUTOCAL
0.1…5s
HIGH:
≥
12VDC
LOW:
≤
2VDC
