R O P E X
R O P E X
R O P E X
R O P E X
INDUSTRIE - ELEKTRONIK GmbH
Proper operation depends upon the accurate calibra-tion
of the system. Because the resistance of the heatseal
element may very depending upon its precise length and
cross-section, the calibration ("Z" point) must be checked
and reset after each change or replacement of the
heatseal element.
(see Sect. 8, "Heatseal Element" and Sect. 7, "Operating
Instructions")
A
feature prevents the overheating of the
heating element when the controller is improperly
calibrated, set below the "Z" point.
Should this occur, the RES-241 controller will not accept
the START signal, while the RES-242 will go into "ALARM"
and shut down.
"START-Lock"
Page 3
ZERO CALIBRATION
ZERO calibration is the adjustment of the controller to the
resistance of the cold heatseal element.
This calibration must be performed with the heatseal
band at room temperature. The hand of the analog
temperature meter is set to "Z" by turning the "ZERO"
adjustment trimmer with the heatseal element at ambient
temperature and the controller in the monitoring mode.
("Z" = 20°C/68°F). After calibration the hand should rest
quietly at "Z".
START-FUNCTION
A heating cycle is initiated with the start function. The
controller then switches from the monitoring mode to the
regulating mode, and concurrently starts the timing
cycles. The START signal can be given in three different
ways:
NOTE - When using new heating elements:
After a few temperature cycles the resistance of the
element will be reduced, the calibration may no longer be
correct. When this occurs, allow the heating element to
return to ambient temperature and reset the meter to "Z"
by using the Zero Trimmer.
100
200
300
0
Z
°C
Mechanical zero adjustment.
Do not move!
START ENABLE
when needle is
below zero
2.2
2.3
by pressing "HAND" on the front panel
by closing the circuit between terminals 2 and 7,
with potential free contact.
by supplying 24VDC to Terminals 3 and 4
Control Function (Continuation)
full
heat current
reduced
heat current
temperature display
controller
sampling
sampling
OFF
OFF
Start
ON
20°C
set point
Current
Temp.
Start
regulating mode
sampling
pulses
actual
temperature
