R O P E X
R O P E X
R O P E X
R O P E X
INDUSTRIE - ELEKTRONIK GmbH
Page 10
Power turned off (cooling); LED 5blinks (measuring mode)
Controller "OFF". LED 5blinks (measuring mode)
Heating up with maximum power
Regulating to medium power to reach the pre-set temperature befor jaws close
Regulating to higher power to maintain the pre-set temperature when heat is drawn from band (sealing)
TEMP.
START
Phase
1
2
3
4
5
6
t
t
t
t
JAW ACTION
S
S
OPEN
OPEN
CL
OSING
CLOSED
OPENING
CURRENT I
2
(= LED OUTPUT)
I
MAX
MONITORING
PULSE
MONITORING
PULSE
A
B
C
D
Phase :
Start Signal is " off ".
Start " on " -
Sealing Phase -
Cooling Phase -
Jaws are open and heatseal band is cooling from
the previous cycle.
Heatseal band temperature rises to
the "set point" while jaws are closing. Preferably, the
set temperature is reached befor jaws totally close.
Power output is controlled. Temperature remains at
"set point". Jaws become completely closed.
Sealing time is necessary to
achieve a good seal. Power output is controlled.
Jaws are closed. Heat is being transferred into the
material being sealed.
Cooling time is needed to achieve
a strong seal. Power "off". Heatseal band cools as
remaining heat is drawn off into the mass of the jaws.
Jaws remain closed.
Jaws are opening. Heatseal band continues to cool.
ON
OFF
OFF
COOLING
SET POINT
1
2
3
4
5
6
Timing
Timing chart
Diagram D shows the magnitude of current flow during a sealing cycle.
Phase
:
1
Phase
:
2
Phase
:
3
Phase
:
4
Phase
:
5
Phase
:
6
The high thermo-dynamic response of this process demands very exact timing between the controller operation and
the heatseal jaws for best results.
