KMC FLEXSTATTM BAC-10000 - Manual (Page 14)

BAC-10000 Series 14 Operation Guide, Rev. J
Resetting the FlexStat
Types of Reset
If the FlexStat is not operating correctly or if a low
limit alarm has occurred, the FlexStat should be
reset (reinitialized). Any reset interrupts normal op-
eration, and three types of reset exist:
• A warm start is generally the least disruptive op-
tion (restarting normal operation the quickest).
• If problems still persist, try a cold start. (This
should also be used after a new Control Basic
program is loaded and compiled.)
• If problems still persist (or major changes in a
firmware update have taken place) restoring fac-
tory defaults (and reconfiguring and reprogram-
ming 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 re-
start is a process that lasts around ten seconds,
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. See
Fan Setup on page 5
(built-in, selectable applications with compres-
sors have a default programmed minimum off
time of 300 seconds).
A warm start does the following in the FlexStat:
• (After zeroing 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:
• (After zeroing out objects during the restart
process) returns all object values to their relin-
quished defaults (until they are updated by the
FlexStat’s programs).
ADVANCED
APPLICATION
CB PROGRAMS
COMMUNICATION
DATE/TIME
DEVICE
LIMITS
SECURITY
DEVICE
INSTANCE: 1
NAME: FlexStat_101
LOCATION: KMC Controls
RESTART:
RESTORE FACTORY: NO WARM START
• Restarts the controller’s Control Basic programs.
• Leaves configuration and programming intact.
NOTE: Menu changes may take up to about two
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,
TotalControl, or BACstage 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 four hours). If
the the RAM checksum test fails, a cold
start will be done instead. (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 TotalControl or BACstage for more
information.)
To perform a WARM start, do one of the following:
• From the FlexStat menu, select Advanced > De-
vice > Restart > Warm Start.
• From TotalControl or BACstage, select Reinitial-
ize Device > Warm Start.
• Momentarily remove power to the FlexStat.
To perform a COLD start, do one of the following:
• From the FlexStat menu, select Advanced > De-
vice > Restart > Cold Start.
• From TotalControl or BACstage, select Reinitial-
ize Device > Cold Start.