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EXCEL 50/100/500/600/800 COMMUNICATION
EN2B-0092GE51 R0512
55
Calculated Runtime Actual Runtime
>100% permanently open
>96% 96% plus 100% of defined runtime (Excel 500)
96% plus 200% of defined runtime (Excel 50)
<2% 2% minus 100% of defined runtime (Excel 500)
2% minus 200% of defined runtime (Excel 50)
<0% permanently closed
Internal hysteresis is 2 to 3.125% and 95 to 96% of defined runtime.
XF825 Synchronization will take place in the following situations:
Calculated position < Lower sync threshold
The floating actuators will be synchronized when the associated input signal drops
below the lower synchronization threshold, which is 2% by default.
In order to avoid any logical interlock problems, this type of synchronization will
immediately be finished when the input signal exceeds the lower synchronization
threshold + sensitivity hysteresis. The actuator will drive to –“Synchronization Time”
in this case.
An additional synchronization with -20 % is done after half an hour and one hour in
order to compensate temperature drifts of the valve.
Example:
A cooling valve is closed. The valve is cold at the time it is closed. The valve will get
warm and expand. This may result in leakage.
Calculated position > Upper sync threshold
The floating actuators will be synchronized when the associated input signal
exceeds the upper synchronization threshold, which is 98% by default.
In order to avoid any logical interlock problems, this type of synchronization will
immediately be finished when the input signal drops below upper synchronization
threshold – sensitivity hysteresis.
Synchronization after power-up / 24 hours
The floating actuators will be synchronized in the following situations:
• Always after power-up or reset of the Excel 800 controller
• Optionally, once every 24 hours the actuator will be driven towards the “closed”
position.
Initialization of Distributed I/O Modules
XFL52x V1.02 with Excel 500 V2.01.03 During and after initialization of the Distributed I/O modules, the output of the
Remote Override Modules XFR522/XFR522A and XFR524/XFR524A will remain
unchanged. This means that the output status will always remain unchanged as
long as the 24 Vac power supply is applied and as long as there is no manual
change at the XFRxxxx modules.
New Bus Devices
The system automatically detects new devices. When it has detected a new device,
the system reinitializes so the new device is included in the Device Type List.
Network-Wide Controller Time Synchronization
Network-wide time synchronization is carried out automatically once each hour by
the designated synchronization master. Each controller with firmware V2.0.xx or
higher can act as a synchronization master. If the time is manually changed on any
of the connected system bus controllers, then this time is adopted for synchroni-
zation. If the controller on which the time was changed is eligible as a synchroni-
zation master, then it will become the synchronization master on the bus.
Synchronization is based on date, hours, minutes, and seconds to an accuracy of
± 120 seconds across the system bus (detected after no more than 1 hour). If this
time is exceeded, an alarm is generated. Daylight saving time is included in the