Baelz Automatic 6490B Device Manual
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Contents
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Page 24Device manual 6490B / 6490B-y / 6590BW. Bälz & Sohn GmbH & Co. Koepffstraße 5 D-74076 Heilbronn Telefon (07131) 1500-0 Telefax (07131) 1500-213.28 Synchronizing the manipulated variable Y-display Y.SYY.SY defines the kind for synchronization of the manipulated variable at start of the controller.Selection: 0 Mains power has been switched on: internal manipulated variable = 0%, CLOSE pulse duringthe valve actuating time t.P.At mains failure: internal manipulated variable is not saved.Note: Used when the actual valve position is allowed to stay in any position between 0% and100%. The CLOSE command causes a synchronization of internal and actualmanipulated variable. The synchronization is executed by restarting the plant as well asin case of a temporary power failure.Disadvantage: The begin of the actual control of the system starts later, exactly like the valveactuating time is adjusted.1 Mains power has been switched on: internal manipulated variable = 0%At mains failure: internal manipulated variable is not saved.Condition: The valve has to be closed, i.e. by an external control, before switching on thedevice. This condition must be kept when restarting the plant as well as in caseof a temporary mains failure.Advantage: The actual control of the system starts immediately.2 Mains power has been switched on: internal manipulated variable = latest saved manipulatedvariable before the mains failure.At mains failure: internal manipulated variable is saved.Condition: The valve has to stay at the same position like at the last switch off whenrestarting the plant. In case of a temporary mains failure, controlling can becontinued with a constant Y-display and valve position.3 Mains power has been switched on: internal manipulated variable = saved manipul. variable.At mains failure: internal manipulated variable is not saved.Condition: Before switching on mains voltage, the valve has to be moved to the sameposition like the saved Y-display (%) to correspond with it.This can be realized i.e. by an external control.If the controller is switched on during the positioning of the valve, then it has tobe stopped by a STOP command as long as the positioning is not finished yet.Also after a temporary mains failure, the positioning has always to be donebecause the initial position of the valve does usually not correspond to the onethat has been saved.Procedure: In manual mode and at the setting "Y.SY=2" the desired percental manipulatedvariable will be adjusted using and (display manipulated variable withnumerical display or bargraph display).By turning off the controller, the adjusted manipulated variable will be saved.After mains power has been switched on again and "Y.SY=3" is adjusted, this Ystart position is valid at any mains recovery and it is also shown in the Y-display.4 Without bargraph display for the manipulated variable (stays dark)Synchronization like at Y.SY=05 Without bargraph display for the manipulated variable (stays dark)Synchronization like at Y.SY=16 Without bargraph display for the manipulated variable (stays dark)Synchronization like at Y.SY=27 Without bargraph display for the manipulated variable (stays dark)Synchronization like at Y.SY=3Note: When "Y.SY" is set to 4, 5, 6 or 7, the bargraph display (at 6490B-y) for the manipulated variable staysdark.Displaying numerical manipulated variable in the operating level is, independent on the setting "Y.SY",possible at any time. |
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