Startup and operation
Page 24
RES-430
4.
"End of cooling phase"
A single force diagnosis takes place at the end of
the cooling phase.
9.5.3
Calibration of the load cell
interface
The integrated load cell must be calibrated to the
specifics of each machine when the controller is started
up. The necessary values can be entered with
steps 244+245.
The load cell can be tared with step 244 when it is off-
load. After loading the cell with a defined, known
weight, the associated reference force must be entered
with step 245. A straight force measurement curve is
assumed between these two measuring points (tare
weight and reference force).
9.5.4
Temperature sensor
The maximum permissible temperature of the sensor
can be set with step 246 (assuming the temperature
sensor has been activated with step 241). An alarm is
immediately output by the controller if this maximum
temperature is exceeded.
If a heatsealing cycle is in progress, it is interrupted.
The temperature monitoring function is activated 3s
after the controller is switched on.
If a temperature sensor is not connected (or if the
sensor connecting cable is defective), an alarm is
output by the controller after 3s (assuming the
temperature sensor has been activated with step 241).
The sensor temperature measurement
described here serves to monitor and/or limit
the load cell or machine temperature. It cannot be
used to monitor the temperature of the heatsealing
band or for temperature control.
9.6
Heatsealing band
9.6.1
General
The heatsealing band is a key component in the control
loop, since it is both a heating element and a sensor.
The geometry of the heatsealing band is too complex to
be discussed at length here. We shall therefore only
refer to a few of the most important physical and
electrical properties:
Minimum force
Force
Time
Alarm signal
Maximum force
Measured
Reference
Weight
0
Tare (zero)
force
Reference force
RES-430
26
Temp.
sensor
0V
27
ϑ
Maximum
Temperature
Time
Alarm signal
sensor temp.
0
!
