Controller functions
Page 40
RES-408
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 optimized for
this application (
section 5 "Accessories and modifications" on page 9).
The meter 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 instrument moreover permits disturbances in the control loop (loose connections, contacting or wiring prob-
lems) as well as any line disturbances to be monitored extremely effectively and interpreted accurately. 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 terminal display – to show a selective error
message on controllers manufactured as of June 2006 (
section 11.21 "Error messages" on page 52). On con-
trollers manufactured up to May 2006, no error messages appear at the analog output. In the event of an alarm,
the last ACTUAL temperature continues to be indicated at the analog output.
This output is not potential-free and could carry the secondary voltage of the impulse transformer.
External grounding is not allowed. If this warning is ignored, the controller will be damaged by frame
currents. Contact voltage protection must be installed at the terminals of the external temperature meter.
11.8
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 the "AC" [
A
uto
C
al] step by pressing the "ENTER" key.
On controllers manufactured as of June 2006, the currently valid initial temperature (ambient temperature) of the
heatsealing bar(s) required for calibration can be preset 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.
"AC" blinks on the display while the "AUTOCAL" function is executing. The actual value output (terminals 17+18)
is set to 0…3°C (corresponds to approximately 0 VDC) until the function has ended.
If the temperature of the heatsealing band varies on controllers manufactured as of June 2006, the "AUTOCAL"
function is executed a maximum of three times. If the function still cannot be terminated successfully, an error mes-
sage appears (
section 11.21 "Error messages" on page 52).
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
!