Digital Temperature Controller Reference Manual
Digital Temperature Controller Reference Manual Digital Temperature Controller Reference Manual
3.3.3 Recipes DTC CONFIGURATION As of DTC version 2.I an unlimited amount of temperature recipes can be stored. Older DTC’s can store a maximum of 16 recipes. The recipes can be selected manually with the Touch Screen or TSC-II or automatically via the DPC or by using the digital inputs on the rear connector if no DPC is present. All the zones include ramping as part of the recipes, thus ensuring the temperature rises at a controlled rate. This prevents furnace, tube or muffle damage due temperature shock. An external timer can switch the DTC from one recipe to another. This can be used as an energy saving feature that allows the temperature of the furnace to be lowered at nights and weekends. 3.4 Independent or Master/Slave Control The control zones normally operate in the Independent (I) mode. In this case, all the zones are completely independent of each other. However, the possibility exists to operate four or five zones (Slaves) under the control of another (Master). This is known as Master/Slave Control (MS). In this configuration the center zone (2 in a 3-zone furnace, 3 in a 5-zone furnace) is the master. All other zones operate normally as if they were independent zones. However, if during a ramp up or a cool down the master cannot follow its temperature setpoints, the Master/Slave loop becomes active. The deviation of the master from its setpoints is subtracted from the temperature setpoints of the slaves. This results in the same actual temperature for all three zones. When the furnace is not ramping, the Master/Slave loop becomes active if the deviation from the setpoints in the master is greater than 5 ºC. This configuration will only work correctly if the master is slower than the slaves. If this is not the case, either the gain value of the slaves has to be increased or the gain value of the master has to be decreased. A comparison of the zone temperatures for both types of control is given in Figure 3-2. Figure 3-2 Independent and Master/Slave control DIGITAL TEMPERATURE CONTROLLER REFERENCE MANUAL 3-4
4.Installation and Calibration 4.1 Installation INSTALLATION AND CALIBRATION STEP 1: The Digital Temperature Controller, once configured correctly, is mounted on the side of the furnace. The DTC is installed prior to delivery. Before applying the line voltage to the unit check if: a) The local line voltage meets the specified conditions for your particular controller. b) The SCRs or triacs are wired to the interconnection board SCR stand. NOTE Wiring the SCRs incorrectly could cause serious damage to the DTC output board. c) The jumpers on the processor board are set correctly for the number of control zones and type of thermocouple being used (see section 2.2.3). STEP 2: After the above checks are made, the line voltage can be applied to the controller. Before programming the controller the user should wait 10 seconds, during which time any alarms generated by the control zones will be displayed. The unit should now be calibrated as described in the next section. 4.2 Calibration At the time of delivery, the DTC has been calibrated for accurate operation. However, it is advisable to repeat the cold junction board calibration of section 4.2.3. To ensure the continued accuracy of the controller the entire calibration procedure should be carried out at regular intervals indicated in the maintenance schedule. 4.2.1 Equipment required The following standard laboratory equipment is required to calibrate the controller. a) 5 Digit DC Digital Voltmeter. b) Precision Power supply - Resolution 1 µV c) Ambient Temperature Thermometer. DIGITAL TEMPERATURE CONTROLLER REFERENCE MANUAL 4-1
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- Page 5 and 6: List of figures LIST OF FIGURES Fig
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4.Installation and Calibration<br />
4.1 Installation<br />
INSTALLATION AND CALIBRATION<br />
STEP 1:<br />
The <strong>Digital</strong> <strong>Temperature</strong> <strong>Controller</strong>, once configured correctly, is mounted on the side of the<br />
furnace. The DTC is installed prior to delivery. Before applying the line voltage to the unit<br />
check if:<br />
a) The local line voltage meets the specified conditions for your particular controller.<br />
b) The SCRs or triacs are wired to the interconnection board SCR stand.<br />
<br />
NOTE<br />
Wiring the SCRs incorrectly could cause serious damage to the DTC<br />
output board.<br />
c) The jumpers on the processor board are set correctly for the number of control<br />
zones and type of thermocouple being used (see section 2.2.3).<br />
STEP 2:<br />
After the above checks are made, the line voltage can be applied to the controller.<br />
Before programming the controller the user should wait 10 seconds, during which time any<br />
alarms generated by the control zones will be displayed.<br />
The unit should now be calibrated as described in the next section.<br />
4.2 Calibration<br />
At the time of delivery, the DTC has been calibrated for accurate operation. However, it is<br />
advisable to repeat the cold junction board calibration of section 4.2.3. To ensure the<br />
continued accuracy of the controller the entire calibration procedure should be carried out at<br />
regular intervals indicated in the maintenance schedule.<br />
4.2.1 Equipment required<br />
The following standard laboratory equipment is required to calibrate the controller.<br />
a) 5 Digit DC <strong>Digital</strong> Voltmeter.<br />
b) Precision Power supply - Resolution 1 µV<br />
c) Ambient <strong>Temperature</strong> Thermometer.<br />
DIGITAL TEMPERATURE CONTROLLER REFERENCE MANUAL 4-1
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