RC3-LOG & RC3P-LOG INSTRUCTION MANUAL
Page
12
SHAWALMEX-EUROPE BV
RC3-LOG & RC3P-LOG INSTRUCTION MANUAL SEPT 2018
5.2.1. 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
M
(on manual) position and push the red manual heating button.
These buttons have 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.
5.3.
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
controller 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 controller. 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.
6.
MAINTENANCE
6.1.
Opening the Control Cabinet
To access the circuits in the control box, a + blade screw driver is required.
Safety:
Disconnect the power supply.
1.
Remove the screws around the perimeter of the front panel.
2.
The front panel can now be removed from the cabinet as one assembly.
6.2.
Overload Protection
There is overload protection inside the control cabinet for
the platens . A fuse on the front plate protects the control
circuit.
The control circuit is protected with a 2 amp fuse (see figure
1), which is located in the center of the control panel front
plate.
The platens are protected with a 32 Amp circuit breaker.
The circuit breaker can be reset to one at the side of the
control cabinet (see figure 3) by opening the window and set
the switch to 1.
6.3.
Temperature Calibration
After replacing a temperature controller, a platen temperature sensor or a platen heating element the temperature
controller should be calibrated to achieve the best performance. Failure to calibrate the controller with the
vulcanizer will result in temperature over shoot and the temperature control will be less precise.
Figure 9 Overload Protection
