Device functions
Version 1
RES-5007
Page 21
Beyond that, malfunctions in the control circuit (loose connections, contacting and wiring problems) and possibly
network faults can be observed very well at the display instrument and interpreted accordingly. This applies also
for mutual influencing of several neighbouring control circuits.
In case of alarm, this analogue output is used to output differentiated error messages (
8.4
Autom. zeroing (AUTOCAL)
Due to automatic zeroing (AUTOCAL), manual zero point setting at the controller is not necessary. With the
AUTOCAL function, the controller adapts to the current and voltage symbols present in the system. In the factory
setting, zeroing is carried out at the basic temperature of 20 °C.
Perform the AUTOCAL function only when heating element and support rail have cooled off (basic
temperature).
Variable basic temperature:
The basic temperature for the AUTOCAL function can be set in the range of 0…+40 °C with the visualisation soft-
ware (
section 8.11 "USB interface for visualisation software ROPEXvisual
" on page 27). This setting is main-
tained even after the controller is switched off and on.
Moreover, the “External calibration temperature” can be selected through the visualisation software. With this set-
ting, the basic temperature is specified through the analogue input (terminal 16+13) in the range +3…+40 °C
(
section 8.2 "Temperature setting (setpoint specification)" on page 19). The specification value at the analogue
input must be present when the AUTOCAL function is activated. If too high of a temperature (greater than 40 °C)
or a fluctuating specification value is specified, a corresponding error message is output (error no.115 and 116;
section 8.16 "Error messages" on page 29).
The AUTOCAL is activated through a 24 VDC pulse at terminals 5+13.
The automatic calibration process lasts about 10…15 seconds. The heating element is not additionally heated
during this process.
The related yellow LED on the front panel lights up when the AUTOCAL function is executed. The actual value
output (terminal 17+13) goes to 0…3 °C (i.e. approx. 0 VDC).
If the heating element temperature fluctuates, the AUTOCAL function is performed a maximum of 3x. After that, if
the function cannot be successfully ended, an error message is output (error no. 114;
Perform the AUTOCAL function only when heating element and support rail have cooled off (basic
temperature).
Blocking of the AUTOCAL function:
1. The AUTOCAL function is not accepted until 10 seconds. after the controller is switched on. If activation is too
!
RES-5007
Max. 6 mA
5
13
AUTOCAL
+
-
GND
24 VDC
AUTOCAL
0.1…5 s
HIGH:
≥
12 VDC
LOW:
≤
2 VDC
!
