Device functions
Page 25
UPT-6011
Version 5
8.5.1
Automatic zero calibration AUTOCAL (AC)
Owing to the automatic zero calibration (AUTOCAL) function, there is no need to adjust the zero point manually
on the controller. This function adjusts the controller to the current and voltage signals present in the system and
calibrates it to the value which is predefined in the parameter data (
section 8.7.5 "Variable calibration temper-
ature" on page 54). If no parameter data is transferred by the EtherNet/IP
TM
scanner, the default value is 20 °C.
Some EtherNet/IP
TM
scanners do not allow the parameter data to be changed during operation. In this case, the
calibration temperature cannot be adapted to the actual ambient conditions in the machines.
The calibration temperature can thus be specified by means of the "Set point / AC temperature" input data when-
ever the zero point is calibrated, provided this is permitted in the parameter data (
bration temperature" on page 54). You can specify it in the 0…+40 °C range. The specified calibration temperature
must be entered in the "Set point / AC temperature" input data when the AUTOCAL function is activated
(AC bit = 1). This specified value must not be changed until the "AUTOCAL" function has finished.
If the specified temperature is too high (greater than 40 °C) or if the specified value fluctuates, an error message
appears (error codes 115 and 116;
section 8.19 "Error messages" on page 67).
The AUTOCAL request (AC bit = 1) is executed by the controller provided the AUTOCAL function is not blocked.
The automatic calibration takes around 10…15 seconds. The heating element is not heated during this period. The
yellow LED on the front panel lights up while the AUTOCAL function is executing and the controller shows
"AUTOCAL active" (AA bit = 1) in the output data. The actual value output (terminals 17+18) changes to 0…3 °C
(corresponds to approx. 0 VDC).
If the temperature of the heating element fluctuates, the AUTOCAL function is executed a maximum of three times.
If the function still cannot be executed successfully, an error message appears (
You should always wait for the heating element to cool down (to ambient temperature) before acti-
vating the AUTOCAL function.
The AUTOCAL function is blocked:
• during the first 10 seconds if the controller does not report an alarm after being switched on or reset and the
cooling speed is less than 0.1 K/s.
• if the cooling speed of the heating element is greater than 0.1 K/s.
Note:
If the AC bit is activated and the cooling speed has fallen below 0.1 K/s, the controller carries out the AUTOCAL
function.
• if the START bit is activated (ST bit = 1).
The "HEAT" LED lights up or blinks.
• if the RESET bit is activated (RS bit = 1).
The "AUTOCAL" LED blinks slowly (1 Hz).
• if error numbers 101 to 103, 201 to 203 or 9xx occur directly after switching on the controller. (
• if the controller has operated correctly at least once after being switched on and error numbers 201 to 203 or
9xx occur (
section 8.19 "Error messages" on page 67).
• if the line voltage is missing when switching on.
The "AUTOCAL" LED blinks slowly (1 Hz).
Note:
If the AUTICAL function is blocked, the controller reports “AUTOCAL blocked” in the output data (AG bit = 1). If
there is an AUTOCAL request in the input data at the same time (AC bit = 1), the "AUTOCAL" LED blinks quickly
(4 Hz).
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