Trend viewer, Resetting the flexstat, Types of reset – KMC Controls FlexStat Operation Guide User Manual
Page 26: Warm and cold starts, Types of reset warm and cold starts, Down to the, Caution
FlexStat 26
Operation Guide, Rev. R
Trend Viewer
TREND VIEWER
1:
2: SPACE HUMIDITY 27
3: FAN
19
4: COOL 1
18
5: COOL 2
21
6:
7:
SPACE TEMP 34
TL #1 SPACE TEMP
APR11 1:27PM, 70.3
APR11 2:27PM, 71.3
APR11 3:27PM, 71.6
APR11 4:27PM, 71.8
APR11 5:27PM, 76.3
APR11 6:27PM, 81.2
APR11 7:27PM, 82.3
To view trend log buffers, press:
1. Up/Down to move among entries.
2. Enter to select.
Trend logs are
set up in the
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.
The “up time” since the last reset can be seen in the
.
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
(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.