Controller functions
Page 24
RES-402
Version 1
The automatic calibration process takes around 10…15seconds. The heatsealing band is not heated during this
process.
The yellow LED on the front panel lights up when the "AUTOCAL" function is active. The actual value output
(terminals 11+12) is 0…3°C (corresponds to app. 0 VDC).
If the temperature of the heatsealing band varies on controllers manufactured as of January 2006, the "AUTOCAL"
function is executed a maximum of three times. If the function still cannot be terminated successfully, an error mes-
sage appears (
section 7.9 "Error messages" on page 27).
You should always wait for the heatsealing band and the bar to cool down (to ambient temperature)
before activating the "AUTOCAL" function.
Reasons for disabled "AUTOCAL" function:
1. The "AUTOCAL" function cannot be activated until 10seconds after the controller is switched on. If you attempt
to activate it sooner, it will not work.
2. The "AUTOCAL" function cannot be not activated if the heatsealing band cools down at a rate of more than
0.1K/s. If the control signal is activated, the function is executed automatically providing the cooling rate has
fallen below the above-mentioned value.
3. If the "START" signal (24VDC) is active, the "AUTOCAL" function is not executed ("HEAT" LED lit).
4. If the "RESET" signal (24VDC) is active, the "AUTOCAL" function is not executed.
5. If the controller has already operated correctly - at least once - after starting up, the "AUTOCAL" function cannot
be activated if the "ALARM" LED is lit continuously.
If the "AUTOCAL" function is locked and you attempt to activate it, the yellow LED blinks.
7.5
"START" signal (HEAT)
When the "START" signal is activated, the controller-internal set/actual comparison is enabled and the heatsealing
band is heated up to the SET temperature. It remains at this temperature until the signal is deactivated again.
The "HEAT" LED on the front panel of the RES-402 is lit continuously for the duration of the heating phase.
The "START" signal is activated by means of a 24VDC signal at terminals 18+12.
The "START" signal is disabled as long as the "AUTOCAL" function is executing or the „RESET“ signal is active.
The set point that is selected for the heatsealing temperature must be greater than 40°C. If not, the heatsealing
band will not be heated up (the "HEAT" LED blinks).
!
!
RES-402
max. 6mA
18
12
START
(HEAT)
+
-
GND
24VDC
START (HEAT)
HIGH:
≥
12VDC
LOW:
≤
2VDC
13
