To set up the driver
Carrier® ChillerVu™
(OPN-PSM-MPCXPE)
Carrier Proprietary and Confidential
CARRIER CORPORATION ©2017
Installation and Start-up Guide
46
All rights reserved
Time Synch Sensitivity
(seconds)
When the controller receives a time sync request, if the difference between the
controller's time and the time sync's time is greater than this field's value, the
controller's time is immediately changed. If the difference is less than this field's
value, the controller's time is slowly adjusted until the time is correct.
Network Microblocks
Number of poll retries before
Network Input Microblocks
indicate failure
The maximum number of retries after the initial attempt that a Network
microblock will attempt to communicate with its target device. If unsuccessful, the
point will transition to an idle state for 30 seconds before attempting to
communicate again. Change this field only if directed by Technical Support.
Periodic rebinding interval
If a microblock uses a wildcard in its address, this timer determines how often the
microblock will attempt to find the nearest instance of its target. For example, if
an outside air temperature address uses a wildcard, a VAV application will look for
the outside air temperature on the same network segment or on the nearest
device containing that object.
BACnet COV Throttling
Enable COV Throttling
Under normal circumstances, COV Throttling should be enabled to prevent
excessive network traffic if an object's COV Increment is set too low. See
EXCEPTION below.
When enabled, if an object generates excessive COV broadcasts (5 updates in 3
seconds), the driver automatically throttles the broadcasts to 1 per second. Also,
if the object's value updates excessively for 30 seconds, an alarm is sent to the i-
Vu® application listing all objects that are updating excessively. A Return-to-
normal alarm is sent only after all objects have stopped updating excessively.
EXCEPTION: In rare circumstances, such as process control, a subscribing object
may require COV updates more frequently than once per second. For these
situations, clear this checkbox, but make sure that your network can support the
increased traffic. You will also need to disable the
Excessive COV
alarms under
the driver's
Common Alarms
.
Trend Sampling
Collect a daily midnight
sample for all points in this
controller that are sampling
on COV
For values that change infrequently, select to verify at midnight daily that the
point is still able to communicate trend values.
Device
On the
Device
page, you can change the following properties:
•
BACnet device object properties for the Carrier® ChillerVu™
•
Carrier® ChillerVu™ communication
Configuration
NOTE
The three APDU fields refer to all networks over which the Carrier®
ChillerVu™ communicates.
Max Masters and Max Info
Frames
Apply only if the Carrier® ChillerVu™'s MS/TP network is enabled.
