Device functions
Version 2
RES-5012
Page 25
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 8.7.4 "Variable calibration tempera-
ture" on page 36). If no parameter data is transferred by the EtherCAT
®
master, the default value is 20 °C.
Some EtherCAT
®
masters do not allow the parameter data to be changed during operation. In this case, the cali-
bration 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 36). 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 50).
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 heatsealing band is not heated during this process.
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 heatsealing band fluctuates, the AUTOCAL function is executed a maximum of three
times. If the function still cannot be executed successfully, an error message appears (
sages" on page 50).
The AUTOCAL function should only be activated while the heatsealing band (and the environment, i.e. silicone,
PTFE cover, sealing bar etc.) is still cold (base temperature).
Reasons for blocked AUTOCAL function:
1. An AUTOCAL request cannot be accepted until 10 seconds after the controller is switched on. During this time
the controller shows "AUTOCAL blocked" (AG bit = 1) in the output data.
2. The AUTOCAL function is not activated if the heatsealing band cools down at a rate of more than 0.1 K/s. If
the AC bit is set, the function is automatically executed when the cooling rate falls below the specified value.
3. If the START bit is set (ST bit = 1), the AUTOCAL function is not executed ("HEAT" LED lit).
4. If the RESET bit is set (RS bit = 1), the AUTOCAL function is not executed.
5. The AUTOCAL function cannot be activated if error codes 101…103, 201…203 or 9xx appear as soon as the
controller is switched on (
section 8.19 "Error messages" on page 50). It also cannot be activated if error
codes 201…203 or 9xx appear and the controller has operated correctly at least once since being switched on.
If the AUTOCAL function is blocked (AG bit = 1), an AUTOCAL request (AC bit = 1) causes the "AUTOCAL" LED
to blink fast (4 Hz).
8.5.2
Start (ST)
When the START bit is set (ST bit = 1), the controller’s internal set / actual comparison is enabled and the heat-
sealing band is heated to the SET temperature. It remains at this temperature either until the ST bit is reset or until
the actual heating time exceeds the preset heating time limit (
section 8.7.5 "Heating time limit" on page 36).
The "HEAT" LED on the front panel of the RES-5012 lights up continuously for the duration of the heating time.
A start request is not processed as long as the AUTOCAL function is active, a fault is present on the controller,
the set point is less than 20 °C higher than the calibration temperature, or the RS bit is set. In this case, the "HEAT"
LED blinks.
The heatup process is terminated if the ST bit is reset or if a communication error occurs.
The ST bit is only accepted if the AUTOCAL function is deactivated and there are no faults.
The alarm relay is switched if the ST bit is set while a warning with error code 104…106, 111…114, 211, 302, or
303 is indicated (
section 8.19 "Error messages" on page 50). The heating element is not heated.
