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

•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.)

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).

ADVANCED APPLICATION

CB PROGRAMS

COMMUNICATION DATE/TIME DEVICE

LIMITS SECURITY

DEVICE

INSTANCE: 1

NAME: FlexStat_101

LOCATION: KMC Controls

RESTART: WARM START

RESTORE FACTORY: NO

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).

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.

BAC-10000 Series

14

Operation Guide, Rev. J

Page 13 Page 15
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KMC BAC-10000 manual Resetting the FlexStat, Types of Reset, Warm and Cold Starts
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BAC-10000 specifications

The KMC BAC-10000 is a cutting-edge building automation controller designed to offer exceptional performance in monitoring and controlling HVAC systems, lighting, and various other building systems. This advanced controller is engineered to enhance energy efficiency, improve occupant comfort, and provide streamlined building management capabilities.

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