Ropex Resistron RES-220 Wiring Diagram Download Page 8

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R O P E X

INDUSTRIE - ELEKTRONIK GmbH

Page 8

Set temperature potentiometer to "0". Push "HAND"
button 4 to activate the controller. LED "ON" will change
from blinking to constant illumination. Slowly increase
temperature. The increase in temperature can be
observed at the meter. The needle must rise steady and
smoothly in response to the temperature changes of the
heatseal element both in heating and cooling.
After a few heating cycles to approx 250°C, let the element

Connect power. LED "ON"

5blinks, and LED "Alarm" 7 must be off.

If the controller goes immediately into "Alarm", check all the wiring to see that it is complete and executed correctly.

If the wiring is correct, see Section "ALARM" for other explanations.

NOTE:

5.4

5.5

Connect the controller as shown in the wiring
diagram. No special attention need be given to
the polarity of the measuring wires for current and
voltage nor for the transformer's primary or
secondary wires.

Make sure that there is

"START" signal,

connection between 2 and 7;

potential on 3.

Please see "General Installation Instruction."

IMPORTANT:

With the heatseal band at ambient temperature, adjust
the Temperature indicator to "Z" by slowly turning the
ZERO Potentiometer

2 . CW to raise, CCW to lower.

If "ZERO" calibration is not possible, (the meter needle
remains high),

pass the wire through the current

transformer a second time; in very extreme cases even a
third time. This situation might occur when the heatseal

element is very long or thin (high
resistance).After creating additional
passes through the current transformer,

the controller.

If calibration is still not possible, recheck
all wiring of the complete system for
possible errors.

recalibrate

5.6

5.7

"ZERO" calibration must only be performed with a heatseal band at ambient temperature.

cool down completely and readjust the "Z" calibration
point. (Also see Heatseal Element; Burn in Effect).
The controller is now ready for operation.

When turning on the controller, follow the correct

sequence. FIRST-Power,

the START signal.

both togheter or in reverse sequence.

However, the temperature may be pre-set befor starting
the controller.

NOTE:

THEN

NEVER

6. HEATSEAL ELEMENTS

Change of Heatseal Elements

6.1

The heatsealing element is an important component of
the control system since it is simultaneously the sealing
element and the temperature sensor. There are so many
different shapes and sizes of heatsealing elements that
we cannot discuss them all here, however, some very
important physical and electrical characteristics are
emphasized here.

The controlling principle demands that the alloy
of the heatsealing element has the proper
temperature co-efficient.
Therefore only Alloy - 20 heatseal bands can be
used with the RES controllers. With other
heatseal band materials the controller may swing
from extreme to extreme, or "run away".

During the first heat up to 200-250°C the heatseal band

will experience a one time change in resistance (burn
in effect). The resistance of the cold element is
reduced by approx. 2-3%.
This rather small change in resistance however results
in a zero point discrepancy of 20-30°.
Therefore, it is necessary to readjust the zero point
after a few heating cycles.
A overheated (burned out) heatseal element cannot
be used and must be replaced because of an
irreversible change in the temperature co-efficient at
high temperatures.
A very important option is to copper plate or silver alloy
coat the ends of the heatseal elements.
Treated ends remains cold and will result in better
temperature control and extend "life" of the heatseal
element as well as of the teflon cover or coating.

After each change of the heatseal element the "Z" point
calibration should be readjusted, if necessary, to

compensate for possible deviations due to allowable
manufacturing tolerances.

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