Controller functions
32
UPT-640 (as of SW 100)
suited to this application (
section 4 "Accessories and
modifications" on page 7).
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 con-
trol loop (loose connections, contacting or wiring pro-
blems) 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 a fault is signaled, this analog output is used – in addi-
tion to the value indicated on the controller – to display
a selective error message (
section 9.27 "Fault areas
and causes" on page 50).
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 216 (analog output):
•
Actual temperature (Factory setting)
The actual value output indicates the current
ACTUAL value as a 0…10VDC analog voltage.
•
10V reference
A fixed 10VDC reference voltage is output at the
actual value output.
9.8
Automatic zero calibration
(AUTOCAL)
Owing to the automatic zero calibration (AUTOCAL)
function, there is no need to adjust the zero point manu-
ally on the controller. The "AUTOCAL" function mat-
ches 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 107 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 execu-
ting and a counter counts down from 13 to 0. The actual
value output (terminals 20+24) is set to 0…3°C (corre-
sponds to app. 0VDC) for the duration of the calibration
process.
If the temperature of the heatsealing band varies on
controllers as of software revision 100, the "AUTOCAL"
function is executed a maximum of three times. If the
function still cannot be terminated successfully, an
error message appears (
section 9.27 "Fault areas
and causes" on page 50).
UPT-640
max. 6mA
25
20
AUTOCAL
+
-
GND
24VDC
AUTOCAL
0.1…5s
HIGH:
≥
12VDC
LOW:
≤
2VDC
