Restarting The Flexstat; Types Of Restart; Warm And Cold Starts - KMC Controls BAC-19 FlexStat Series Application Manual

RESTARTING THE FLEXSTAT

Types of Restart

If the FlexStat is not operating correctly, restart
(reinitialize or reset) it. Any restart interrupts nor-
mal operation, and three types of restart exist:
• A warm start is generally the least disruptive
option (restarting normal operation the
quickest).
• If problems still persist, try a cold start.
• If problems still persist, restoring applications
(and reconfiguring and reprogramming the
FlexStat) may be required.

Warm and Cold Starts

CAUTION
During a restart, the analog outputs go
to zero, and relays go to their normally
open state. A restart is a process that
lasts up to half a minute, and it may
result in several changes of state
for an output, turning equipment off
and on abruptly. Before resetting the
FlexStat, manually override equipment
as needed. If a large fan is controlled
by the FlexStat, for example, set a
minimum off time.
A warm start does the following in the FlexStat:
• Zeroes out objects (during the restart process).
• Restores present values of objects to their
last values before the restart (until they are
updated by the FlexStat's programs).
• Restarts the controller's Control Basic
programs.
• Leaves configuration and programming intact.
CAUTION
If the checksum test in RAM fails
during a warm start, a cold start is
performed instead.
A cold start does the following in the FlexStat:
• Zeroes out objects (during the restart process).
BAC-19xxxx FlexStat Application Guide
• Returns all object values to their relinquished
defaults (until they are updated by the
FlexStat's programs).
• Restarts the controller's Control Basic
programs.
• Leaves configuration and programming intact.
NOTE: Menu changes may take several
minutes to write to nonvolatile Flash
memory. If power to the FlexStat is lost
during this time, changes may be lost.
Restarting the FlexStat from its menu
(when possible) or KMC software are
the recommended methods.
NOTE: When power is restored after an outage,
the FlexStat will attempt to do a warm
start as long as the values in RAM are
retained (up to about six hours). If the
RAM checksum test fails, a cold start
will be done instead.
NOTE: In custom Control Basic programming,
using the POWERLOSS command
may be desirable to determine start-
up conditions and to take appropriate
actions—see the Help system in
software for more information.
To perform a WARM start, do one of the follow-
ing:
• From KMC software, select Reinitialize Device
> Warm Start.
• Momentarily remove power to the FlexStat.
To perform a COLD start, select Reinitialize Device
> Cold Start in KMC software.
To restore the app, do one of the following:
• From the FlexStat menu, select Advanced
> Restore APP > another application and/or
units. Let the FlexStat restart. Restore to the
original application in the same manner.
• From KMC software, right-click the FlexStat
in the Network Manager and select Configure
Device..., expand Application Properties,
select the application and units in the Base
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