
Commissioning and operation
Version 1
UPT-6006
Page 17
7.2.4
Configuration of the alarm relay
When the “Alarm relay contact opens with Alarm/PC CONFIGURATION” is selected, additional configurations for
the behaviour of the alarm output can be set through the ROPEX visualisation software (
section 8.12 "USB
interface for visualisation software ROPEXvisual
®
" on page 46).
7.3
Heating element
7.3.1
General
The heating element is a key component in the control loop because it is not only a heating element but also a
sensor. The geometry of the heating element is too complex to be discussed at length here. We shall therefore
only refer to a few of the most important physical and electrical properties.
The measuring principle used for this system requires a heating element alloy with a suitable temperature coeffi-
cient TCR, i.e. one whose resistance increases as the temperature rises.
Too low a TCR leads to oscillation or uncontrolled heating.
If a heating element with a higher TCR is used, the controller must be calibrated for it.
The CIRUS
®
temperature controller is suitable for temperature coefficients in the range 400…4000 ppm/K.
The base resistance of the heating element increases continuously during operation (owing to the
design). The AUTOCAL function must therefore be run again approximately every 100,000 heat-
sealing cycles in order to prevent ACTUAL temperature measuring errors.
7.3.2
Replacing the heating element
The supply voltage (all poles) must be disconnected from the CIRUS
®
temperature controller in
order to replace the heating element.
The heating element must be replaced in accordance with the instructions provided by the manu-
facturer.
Each time the heating element is replaced, you must run the "AUTOCAL" function (
section 8.5.2 "AUTOCAL
autom. zeroing (AC)" on page 25) and set the correction factor Co (
section 8.7.10 "Correction factor Co" on
page 34). Any production-related resistance tolerances of the heating element are compensated in this way.
0
5
1
2
3
4
6
7
8
9
AU
X
CONF
IG
URATI
ON
ALARM
O
UTP
UT
ENER
GIZ
ED
(A
T AL
ARM)
DE-E
NERG
IZ
ED
Alarm relay contact
opened by alarm/
PC-CONFIGURATION
Alarm relay contact
closed by alarm.
(factory setting)
!
!
!
Содержание CIRUS UPT-6006
Страница 62: ...Index Page 62 UPT 6006 Version 1 ...