User manual OMRON E5ZE

[. . . ] E5ZE Multipoint Temperature Controller Operation Manual Catalog No. H076-E3-1 Notice: OMRON products are manufactured for use according to proper procedures by a qualified operator and only for the purposes described in this manual. The following conventions are used to indicate and classify precautions in this manual. Always heed the information provided with them. [. . . ] · In manual operation, set the output value through communications. · If manual operation is continued after the power has been turned OFF or if manual operation is started when the E5ZE has stopped operation, the output value will be 0. 0%. In this case, reset the output value. 3-8-1 Manual Operation 39 Control Method Selection Section 3-8 · When switching between manual operation and 2-PID control, the output value will enter balanceless, bumpless operation. Output value (%) Balanceless, bumpless operation 0 Time Output switch Manual operation 2-PID control Power OFF or operation stopped Output reset value Operating Conditions · The manual output value can be set only during manual operation. The manual output value cannot be set if there is a temperature sensor input error or a Temperature Controller error. · Manual operation cannot be started if auto-tuning is being executed or there is a Temperature Controller error. · The E5ZE-8jjjD1jB (DeviceNet Model) cannot be operated manually if operation has been stopped. Temperature control must be started with remote I/O before manual operation can be started. For further details, refer to the E5ZE-8 Multipoint Temperature Controller DeviceNet Communications Manual (H104). 3-8-2 ON/OFF Control 2-PID control can be switched to ON/OFF control by setting the proportional band (P constant) to 0. 0. Hysteresis In ON/OFF control, hysteresis is used to stabilize operation when a change is made to ON/OFF control. The following diagrams show the operation of control output during ON/OFF control. Reverse operation Hysteresis Direct operation Hysteresis Set point Set point · Set the hysteresis in each memory bank. The settings are only valid when ON/ OFF control is being used. · The setting range is between 0. 0 to 99. 9 (°C or °F). · The default value is 0. 8°C or 1. 5°F. 40 Heating and Cooling Control Section 3-9 3-9 Heating and Cooling Control · The E5ZE-8Vjjjj Models are used for heating and cooling control. · The heating and cooling control function is used for controlling temperatures of objects radiating heat, such as extruding molding machines. The temperature of these objects is controlled using heating control and cooling control outputs. 3-9-1 Dead Band/Overlap Band The dead band/overlap band function adjusts the output method for the proportional output value close to the set point. The following graphs show the heating and cooling output when using proportional control. Dead Band Set Value u 0 Proportional output value (%) Dead band Cooling control output Heating control output Low temperature Dead Band Set Value t 0 Proportional output value (%) Process value High temperature Set point Overlap band Cooling control output Heating control output Low temperature Set point Process value High temperature · If the dead band is too wide, hunting may result. · Control output may occur within the dead band for other types of control apart from proportional control and ON/OFF control. · Set the dead band in each memory bank. · The setting range of the dead band is ­999 to +999°C (or °F). The default is 0. 41 Heater Burnout Detection Section 3-10 · The following graph shows the output when the E5ZE is operating using ON/ OFF control. Dead Band Set Value in ON/OFF Control u 0 Output value (%) Dead band Cooling control output Heating control output Low temperature Heating hysteresis Set point Process value High temperature Cooling hysteresis 3-9-2 Cooling Coefficient The difference between the heating characteristics and cooling characteristics of the object being controlled may cause control by PID constants to be unsatisfactory. By changing the cooling coefficient, however, the balance between heating and cooling can be readjusted. · The cooling coefficient operates according to the following formula. [. . . ] "_" represents a space and "[CR]" represents a carriage return. E5ZE_Copyright_1995_OMRON_Corporation[CR] Procedure 1, 2, 3. . . While in hardware test mode, set pin 8 of the FUNCTION switch to ON. Short-circuit the send data and receive data at the E5ZE when RS-232C or RS-422 communications are being used, as follows: Communications interface Short-circuit locations RS-232C Communications connector: Pins 2 and 3 RS-422 Communications terminal block: Terminals 5 and 2 Terminals 1 and 4 3. [. . . ]