Startup and operation
UPT-640 (as of SW 100)
21
8.4
Heating element
8.4.1
General
The heating element is a key component in the control
loop, since it is both a heating element and 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 elec-
trical properties:
The measuring principle applied for this system neces-
sitates a heating element alloy with a suitable tempera-
ture coefficient TCR, i.e. one whose resistance
increases as the temperature rises.
Too low a TCR leads to oscillation or uncontrolled hea-
ting.
When heatsealing bands with a higher TCR are used,
the controller must be calibrated for this.
The base resistance of the heating elements
rises continuously during operation (con-
struction-conditioned). Due to this the AUTOCAL
function must be executed every 100.000 sealing
cyles for preventing measurement failures of the
ACTUAL temperature.
8.4.2
Replacing the heating element
All power supply leads 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 manufacturer.
Each time the heating element is replaced, the zero
point must be calibrated with the AUTOCAL function
(
section 9.8 "Automatic zero calibration
(AUTOCAL)" on page 32) while the element band is still
cold. The correction factor Co (
section 9.11 "Correc-
tion factor Co" on page 34) must be adjusted too. With
this procedure the production-related resistance toler-
ances of the heating element will be compensated.
8.5
Startup procedure
Please also refer to Kap. 1 „Safety and warning notes“
auf Seite 3 and Kap. 2 „Application“ auf Seite 4.
Installation and startup may only be per-
formed by technically trained, skilled per-
sons who are familiar with the associated risks and
warranty provisions.
8.5.1
Initial startup
Prerequisites: The controller must be correctly installed
and connected (
Kap. 7 „Installation“ auf Seite 12).
The possible settings are described in detail in
chap. 8.3 „Controller configuration“, page 18 and
chap. 9 „Controller functions“, page 23.
The essential controller configurations are described
below:
1. Switch off the line voltage and verify that all circuits
are deenergized.
2. The supply voltage specified on the nameplate of
the controller must be identical to the line voltage
that is present in the plant or machine. The line fre-
quency is automatically detected by the tempera-
ture controller in the range from 47 to 63Hz.
3. Make sure that a START signal is not present.
4. Switch on the line voltage.
5. A power-up message appears on the display for
approximately 2 seconds when the controller is
switched on to indicate that it has been started up
correctly.
6. One of the following states then appears:
7. Set the controller configuration as described in
Kap. 8.3 „Controller configuration“ auf Seite 18. The
following settings are always required:
8. Activate the AUTOCAL function while the heatse-
aling band is still cold (with step 7 in the Settings
!
!
!
DISPLAY
ACTION
Main menu
Go to 7
Error message with error codes
104…106, 111…113, 211
Go to 7
Error message with error codes
101…103, 107, 108,
201…203, 801, 9xx
Fault diagnosis
(
9.27)
Setting
Step in Confi-
guration menu
Language
201
Restore factory settings
202
Temperature range and heatse-
aling band alloy
203, 204, 205
