Controller functions
Page 26
RES-407
Version 1
An indicating instrument can be connected to this output in order to visualize the temperature of the heatsealing
band.
The characteristics of the ROPEX ATR-x temperature meter (size, scaling, dynamic response) are ideally suited
to this application and this instrument should therefore always be used (
section 12 "How to order" on page 47).
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 to display a selective error message
(
section 7.13 "Error messages" on page 34).
7.4
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. This function matches the controller to the current and voltage signals that are present in the
system. The zero point is calibrated in the factory to the initial temperature (ambient temperature, 20°C).
You should always wait for the heatsealing band and the bar to cool down (to ambient temperature)
before activating the "AUTOCAL" function.
Variable initial temperature:
On controllers manufactured as of April 2005, the initial temperature for the "AUTOCAL" function can be set in the
0…+40°C range in the visualization software (
section 7.11 "Diagnostic interface/visualization software (as of
April 2005)" on page 33). This setting is remembered if the controller is switched off and then on again.
As of SW Revision 107, the "External calibration temperature" setting can also be selected in the visualization soft-
ware. The initial temperature for this setting can be specified in the +3…+40°C range via the analog input (termi-
nals 16+14) (
section 7.2 "Temperature setting (set point selection)" on page 23). The value selected at the
analog input must be present when the "AUTOCAL" function is activated.
If the specified temperature is too high (greater than 40°C) or if the selected value varies, an error message
appears (error codes 115 and 116;
section 7.13 "Error messages" on page 34).
0 - 500°C range
1
2
3
4
5
6
7
8
9 10
500
100
150
200
250
300
350
400
450
0.4V
°C
VDC
20°C
Te
m
p
er
atu
re
T
"ZERO"
Voltage U
!
!
