Honeywell EXCEL 5000 User Manual page 85

EXCEL CARE CONTROL ICONS
After all the XFM 36-1s write to the ID___On_Prio_2 datapoint, XFM 35 reads it. If
XFM 35 has to restore some loads, it will read inputs ID___On_Prio_1,
ID___On_Prio_2 and ID___On_Prio_3. If all are 1, it will restore loads in priority
group 3 first, then group 2 and then group 1. If any ID___On_Prio datapoint is 0,
XFM 35 will not send a restore signal (positive kW value) to its corresponding Po
output.
The other datapoints exchange data among the XFMs in a similar way. The
datapoints IA___Off_Index_P and IA___On_Index_P, however, do not exchange
data with XFM 35, only XFM 36-1s. Use the datapoint tables in each XFM section
to determine what information is being exchanged by each datapoint.
A few datapoints are not used for exchanging data among the two XFMs.
ID___Tariff, for example, can be commanded to allow switching between demand
limit setpoints. ID___Man_load_shed is a datapoint that can be set up as an alarm
point to warn the user that all sheddable loads have been shed and the power limit
is still being exceeded. The user should manually shed other loads to avoid
demand charges. The datapoints are explained in the XFM sections.
Because synchronizing the reads and writes of the datapoints is very important to
the correct operation of a power demand program, all XFMs of the power demand
program must reside in one controller. To switch loads in other controllers, the St
output command and the RM feedback input, if used, should communicate globally
to those points in the other controller.
The following diagram shows the connection of XFM 35 and multiple XFM 36-
1/S/Rs where the first XFM 36-1 (No. 1) in priority Group 3 controls a load
connected to another controller via user addresses St1 and RM1. Communication
between the local and global user addresses is via the C-Bus.
Features • Three algorithms, Sliding Window, Ideal Curve, and Extrapolation, for power
measurement and calculation
• Three priority load groups
• Rotating or sequential switching of loads in a group
• Two power limits, use as required (for example, by the Time Program)
• Automatic treatment of synchronization and power failure
• Automatic restart after power failure
• Control of parameter changes and start-up (proper integration of parameter
modifications)
• Load communication via the C-Bus
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ALPHABETIC REFERENCE
74-5577–33 (US)
EN2B-0184 GE51 R0518 (Europe)