Commissioning and operation
Page 16
RES-5007
Version 1
resistance generates a zero point error of 20…30 °C. The zero point must therefore be corrected after a few
heating cycles, that is, the AUTOCAL function must be carried out again.
The burn-in effect described here does not need to be considered if the manufacturer pretreated the heating ele-
ment for this purpose.
A damaged or worn-out heating element may no longer be used due to an irreversible TCR change.
A very important design measure is copper-coating or silver-coating of the heating element ends. The thermal
characteristics change in this range through coating of the heating element ends. As a result, the ends remain
cold, which permits exact temperature control and increases the useful life of the heating element.
7.3.2
Changing the heating element
To change the heating element, the supply voltage must be disconnected from the RESISTRON
®
temperature controller on all pins.
The heating element must be changed in accordance with the manufacturer’s instructions.
After every heating element change, the AUTOCAL function must be performed with a cold heating element (and
cold surroundings: i.e. silicone, PTFE cover, sealing bar, among others) to compensate for production-related tol-
erances of the heating element resistance. With a new heating element, the above-described procedure for
burning in must be performed.
7.4
Commissioning rules
Observe here section 2 "General information" on page 3 and section 3 "Use" on page 6.
Mounting, installation and commissioning may only be performed by qualified and trained persons
who are familiar with the related hazards and warranty stipulations.
7.4.1
Initial startup
Requirement: Device is correctly mounted and connected (
section 6 "Mounting and Installation" on page 7).
Proceed as follows when starting up the controller for the first time:
1. Switch off network voltage; verify that no voltage is present.
2. Set the coding switch on the device in accordance with the ROPEX application report and the heating element
used (section 7.2 "Device configuration" on page 14).
3. Check that there is no START signal present.
4. Apply auxiliary voltage (24 VDC).
5. Switching on the network voltage.
6. After the voltage is switched on, the yellow “AUTOCAL” LED lights up for about 0.3 sec. and displays the cor-
rect switch-on process of the controller. As long as no network voltage is present, this LED flashes slowly
(1 Hz).
At switch-on, if in addition to the yellow “AUTOCAL” LED the red “ALARM” LED lights up for
0.3 sec, the configuration with the visualisation software has been changed for this controller
(
section 8.11 "USB interface for visualisation software ROPEXvisual
" on page 27). The controller’s
configuration must be checked to avoid malfunctions before continuing with commissioning.
!
!
!
!
!
