T4PGF1 INSTRUCTION MANUAL Page 10
SHAW-ALMEX INDUSTRIES LIMITED June 14 2017
7. HEATING THE VULCANIZER
7.1. Heating Up
Safety: Never heat the vulcanizer unattended and do the Pre-use Inspection before starting.
1. There are three positions on the platen switch as follows:
1A - On Automatic. For automatic temperature control to SET VALUE.
0 - Off. Switches power to platens off. Controller remains energized.
1M - On Manual. Override temperature controller and switch power to platen on. This position has a
spring return to off, a Safety Feature so the heat will shut off if the vulcanizer is left unattended.
2. The vulcanizer should be pressurized to at least 5 psi (0.3 kg/sq.cm) before heating.
3. Turn the keyed RESET button to switch power on. Remove the key and have a qualified person hold it.
Then switch the MAIN BREAKER fully OFF (0 or green) with some force and then back ON (1 or red) to
reset. Then turn the keyed RESET button to switch power on. This sets the temperature controllers to
begin the heat cycle. The controllers display will turn Green.
4. Turn the switches to the 1A (on automatic) position to begin heating the vulcanizer. The Ammeter will read
the current for each platen as they are switched on. The OUT 1 light emitting diode on the controller will
light until the process value is close to the set value and then begin to flash. At this point the controllers
display will turn Amber. The platen temperature indicator value will begin to increase as the platen
temperature rises.
Safety: The platen will begin to get hot.
5. Stem thermometers should be inserted into the hole in the platen edge as a secondary means of monitoring
the temperature. The temperature will not necessarily be the same as the temperature control because of
differences in calibration.
6. When the set point is reached, the OUT 1 light emitting diode will continue to flash on and off to maintain
SET VALUE temperature. Start timing the cure when SET VALUE is reached.
7. After the cure time, turn the controller switches to the 0 (off) position.
8. Turn the RESET Key Switch before the next heat cycle.
7.1.1. Manual Heating
If there is a temperature controller malfunction or platen temperature sensor failure, the platen can be heated
manually by turning the platen switch to the 1M (on manual) position.
Safety: This switch has a spring return to off, a Safety Feature so the heat will shut off if the vulcanizer is
left unattended. When using this function, the platen temperature will have to be monitored by an external
temperature indicator such as a stem thermometer.
7.2. Temperature Control
1. A P.I.D (Proportional Integral Derivative) solid state temperature controller that senses the resistance
change in an RTD (Resistance Temperature Device) sensor in each platen effects temperature control. The
controller should maintain temperature at the set point +-3 °F (2 °C) at 300 °F (150 °C).
2. The temperature controller incorporates a proportioning circuit that causes the platens to reach set point
temperature in a minimum of time with less than 2 °F (1.1 °C) of temperature overshoot. In operation, the
controllers will begin cycling off and on slightly below set point. During this initial cycling period, the
temperature will continue to rise to the set point as indicated by the temperature controllers. This early
cycling is a normal function of the controller and should not be reset, otherwise excessive temperatures will
occur.
3. The parameters can be adjusted so that set point is reached in the fastest possible time (straight line heating)
but this will cause the temperature to overshoot the set point by several degrees. Alternatively, the
parameters can be adjusted so there is zero overshoot but the rate of heating will decrease as the set point is
reached. If you wish to fine-tune your controller in either of these ways contact Shaw-Almex for advice.
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