Commissioning and operation
Version 1
RES-5006
Page 19
PROFIBUS protocol (
section 8.4 "PROFIBUS protocol" on page 22). The yellow “AUTOCAL” LED lights up
for the duration of the calibration process (approx. 10…15seconds). During this process, the AA bit (
A
UTOCAL
a
ctive) is set and a voltage of 0 VDC is output on the actual value output (terminal 17+18). A connected ATR-x
shows 0…3 °C.
After zeroing is completed, the “AUTOCAL” turns off and the AA bit is erased again. A voltage of 0.66 VDC (in
300 °C range and Autocal temperature = 20 °C) or 0.4 VDC (in 500 °C range) is reached at the actual value
output. A connected ATR x must be on the “Z” marking.
If zeroing is not performed correctly, the AL bit (
Al
arm active) is set and the red “ALARM” LED flashes slowly
(1 Hz). Then the configuration of the controller is not correct (
section 7.2 "Device configuration" on page 15,
ROPEX application report). After the device configuration is correct, perform zeroing again.
10.After successful zeroing, specify a defined temperature over the PROFIBUS protocol (setpoint) and set the
ST bit. The RA bit (
R
egulation
a
ctive) is now active and the “HEAT” LED illuminated. The heat-up and control
procedure can be observed at the actual value output:
It is functioning correctly when the temperature (i.e. signal change at the analogue output or the actual value
in the PROFIBUS protocol) is steady, that is, does not jump, oscillate or even go briefly in the wrong direction.
Such action indicates an incorrect placement of the U
R
measurement line.
When an error message is issued, proceed according to section 8.19 "Error messages" on page 50.
11.Burning in the heating element (
section 7.3 "Replace and burn in heating element" on page 17) and repeat
AUTOCAL function.
7.4.2
Placing back into operation after changing the heating element
When changing the heating element, proceed according to section 7.3 "Replace and burn in heating element" on
page 17.
Pay attention to correct alloys, dimensions and copper coating of the new heating element to avoid
malfunctions and overheating.
Continue with chap. 7.4 item 4 to item 11.
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