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Device manual
3.28 Synchronizing the manipulated variable Y-display
Y.SY defines the kind for synchronization of the manipulated variable at start of the controller.
Selection:
Note: When "Y.SY" is set to 4, 5, 6 or 7, the bargraph display (at 6490B-y) for the manipulated variable stays
dark.
Displaying numerical manipulated variable in the operating level is, independent on the setting "Y.SY",
possible at any time.
W. Bälz & Sohn GmbH & Co.
0 Mains power has been switched on: internal manipulated variable = 0%, CLOSE pulse during
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% and
100%. The CLOSE command causes a synchronization of internal and actual
manipulated variable. The synchronization is executed by restarting the plant as well as
in case of a temporary power failure.
Disadvantage: The begin of the actual control of the system starts later, exactly like the valve
actuating 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 the
device. This condition must be kept when restarting the plant as well as in case
of 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 manipulated
At mains failure: internal manipulated variable is saved.
Condition: The valve has to stay at the same position like at the last switch off when
restarting the plant. In case of a temporary mains failure, controlling can be
continued 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 same
position 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 to
be 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 done
because the initial position of the valve does usually not correspond to the one
that has been saved.
Procedure: In manual mode and at the setting "Y.SY=2" the desired percental manipulated
variable will be adjusted using
numerical 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 Y
start 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=0
5 Without bargraph display for the manipulated variable (stays dark)
Synchronization like at Y.SY=1
6 Without bargraph display for the manipulated variable (stays dark)
Synchronization like at Y.SY=2
7 Without bargraph display for the manipulated variable (stays dark)
Synchronization like at Y.SY=3
Koepffstraße 5
D-74076 Heilbronn
6490B / 6490B-y / 6590B
Y.SY
the valve actuating time t.P.
variable before the mains failure.
and
(display manipulated variable with
Telefon (07131) 1500-0
Page 24
Telefax (07131) 1500-21
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