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C T [°C] 203 200 Figure C-1. Heating and Cooling Example 1 T [°C] 203 200 197 fan ON fan ON Figure C-2. Heating and Cooling Example 2 Upper Deviation = 3 °C Upper Deviation = 3 °C Lower Deviation = 3 °C fan OFF Hysteresis = 7 °C fan OFF C-2 Temperature Control Module for the Series 90-30 PLC User's Manual – October 1997 GFK-1466 time time
Implementing Low Voltage Bake-out A heater system consisting of one or more heaters (zones) can run in a bake-out mode when an adequate low voltage is applied to heaters. Such a mode could be required when there is a danger of condensation in the heaters. For such a purpose any unused zone can be used. The output of that zone can control a switch, which will apply either a low voltage (for example, 24 V) or a full, that is, a regular voltage to a (set of) heater(s). The zone must be configured to run in the MANUAL mode and its output value must be set to 100%. The thermocouple connected to the input of that zone should measure some average temperature of the system. The Upper Alarm temperature of that zone should be set to a value, Td, which corresponds to a switching temperature from the baking to the regular mode. Now, while the current temperature of that zone is below the switching temperature, the output of that zone will be permanently in the ON position while the low voltage is applied to the rest of heaters. If the average temperature rises above Td, the output will be automatically turned off because of the Upper Alarm condition and the controlled switch now will apply the regular operating voltage to the rest of heaters. If, as a switching temperature between baking and regular mode, the temperature of a controlled zone itself must to be used, the Lower Alarm flag bit could be used for such a purpose. Such an arrangement would require the use of an Output Module (together with a suitable routine in the PLC program) to directly control the applied voltage to the heaters. GFK-1466 Appendix C Applications C-3 C
Page 1 and 2: Programmable Control Products Tempe
Page 3 and 4: Content of This Manual Related Publ
Page 5 and 6: Contents Example 1.................
Page 7 and 8: Contents Table 1-1. Firmware Compat
Page 9 and 10: 1 Auto Mode Diagnostic functions Th
Page 11 and 12: Chapter 2 Installing the Temperatur
Page 13: Section 2: Installing the TCM The T
Page 16 and 17: 3 Module Configuration Data Discret
Page 18 and 19: 3 Discrete Commands (%Q) been calcu
Page 20 and 21: 3 • The channels which will not b
Page 22 and 23: 3 Parameter Data (%AQ) A TCM Error
Page 24 and 25: 3 If any of the transferred paramet
Page 26 and 27: 4 PWM Output Period Auto-Tuning 1.
Page 28 and 29: 4 The following figure is an exampl
Page 30 and 31: 4 Closed-Loop Control Bias Lin.Cont
Page 32 and 33: 4 Power [%] 100% 0% -100% The follo
Page 34 and 35: 5 The series of pulses forces the p
Page 36 and 37: 5 • Period • Regulation Error L
Page 38 and 39: A 02-24-97 14:03 GE FANUC SERIES 90
Page 40 and 41: A %I0041 CH6_OE Channel #6 Output S
Page 42 and 43: A %R0099 CH7_SP CH7 Set Point %R010
Page 44 and 45: A |[ START OF SUBROUTINE LOGIC ] |
Page 47 and 48: Appendix B Specifications Tests and
Page 49: Appendix C Applications Heating and
Page 54: Index O Operating Temperature Setpo

GE Fanuc Automation - Platforma Internetowa ASTOR

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