Startup and operation
RES-430
Page 23
9.5
Load cell interface /
temperature sensor
9.5.1
General
The RES-430 controller can be connected to a load cell
and a temperature sensor. The load cell is used to
measure the closing force of the heatsealing
mechanism. This force can be monitored by the
controller during the heatsealing cycle. If the closing
pressure is outside the specified limit values, the
heatsealing cycle is interrupted and an alarm is
indicated on the display.
The temperature sensor can be used to monitor either
the internal machine/equipment temperature or the
temperature of the load cell. An alarm is output by the
controller if the maximum permissible temperature is
exceeded.
The settings for the load cell interface and the
temperature sensor can be selected as follows with
step 241 in the Configuration menu:
1.
"OFF"
(•)
Load cell interface and temperature sensor not
active
2.
"Force"
Load cell interface for force measurement active,
temperature sensor not active
3.
"Temperature"
Temperature sensor active, load cell interface not
active
4.
"Temperature and force"
Load cell interface for force measurement and
temperature sensor active
The menu steps 242 to 246 described below
are accessible if step 241 is set accordingly.
9.5.2
Force diagnosis
The RES-430 checks during the heatsealing phase
(assuming this has been activated with step 241)
whether the measured force of the connected load cell
is inside a settable tolerance band ("OK window"). The
upper and lower limit values can be changed
separately by means of steps 242+243 in the
Configuration menu.
If the measured force is outside the specified tolerance
during the parameterized monitoring time, the
heatsealing cycle is immediately interrupted and an
alarm is indicated on the display.
This monitoring function serves, among other things, to
ensure a constant closing force of the sealing jaws.
Up to SW revision 007:
The force diagnosis begins 100ms after the ACTUAL
temperature reaches 95% of the SET temperature and
continues until the end of the parameterized cooling
phase.
As of SW revision 008:
The force diagnosis function can be additionally
parameterized by means of step 247 in the
configuration menu. The following settings are
possible:
1.
"OFF"
Force diagnosis deactivated
2.
"Active during heatsealing cycle"
The force diagnosis is permanently active during the
heatsealing phase until the end of the
parameterized cooling phase. If this setting is
activated, an additional delay time between 0 and
9.9s can be parameterized with step 248 in the
Configuration menu. This delay time starts when the
ACTUAL temperature reaches 95% of the SET
temperature. The force diagnosis function is
activated as soon as the delay time elapses.
The force diagnosis function can thus be explicitly
deactivated during the closing movement of the
sealing jaws, for instance.
3.
"End of heating phase"
A single force diagnosis takes place at the end of
the heatsealing phase.
(•) Factory setting
!
RES-430
22
Load cell
0V
25
+5V
23
24
Signal
+
-
-Vcc
+Vcc
