Kmc-controls FlexStat Operation Guide User Manual download pdf (Page 32)

FlexStat 32 Operation Guide, Rev. R

Display Is Blank (or Erratic)

• If the display comes on when a buon is pushed,

Display Blanking is enabled. (See (Advanced)

User Interface (UI) on page 21.)

• Check for a tripped circuit breaker to the trans-

former.

• Carefully remove the FlexStat cover from the

backplate. (See Cover Binds on Backplate on

page 31.) Check pins and connectors. Ensure the

WD (watch dog) jumper is properly installed on

its two pins closest to the center of the board (see

Firmware Upgrade Failures on page 37). Reinstall-

ing the cover on the backplate should restart the

FlexStat if it is supplied adequate power.

• Check for proper supply voltage and phasing

from the transformer and that the transformer

has enough capacity (VA) for all connected

devices. See their respective data sheets and Tips

forConnecting24-VoltPowerApplicationNote

(AN0604D).

NOTE: Wiringmustbeadequatetoavoid

excessivevoltagedroponlongruns!

Allowplentyof“cushion.”Ametermay

betooslowtoregistertransientdipsor

peaksduringstartup.See Wiring Issues on

page 39.

• Put another FlexStat on the installed backplate,

and if the second FlexStat functions properly,

replace the rst FlexStat.

• If the FlexStat has been damaged, check the phas-

ing of the power and network lines.See Wiring

Issues on page 39.

• See also Display Keeps Reseing on page 32.

Display Freezes (Buttons Have No Effect)

• Carefully remove the FlexStat cover from the

backplate and ensure the WD (watch dog) jump-

er is installed on its two pins closest to the center

of the board (see Firmware Upgrade Failures on

page 37). The jumper is temporarily removed dur-

ing a rmware update and should be reinstalled

when the process is completed. Reinstalling the

cover on the backplate will restart the FlexStat.

• If the displayisfunctioning(e.g.timeisupdat-

ingcorrectly),butthebuonshavenoeect

excepttoturnonthebacklight, the FlexStat is in

Locked UI mode. See (Advanced) User Interface

(UI) on page 21.

• See also (Advanced) CO2 Sensor (and DCV) on

page 11.

Display Keeps Resetting

• Carefully remove the FlexStat cover from the

backplate, check pins and connectors, and rein-

sert. (See Cover Binds on Backplate on page 31.)

• Check for proper supply voltage from the

transformer and that the transformer has enough

capacity (VA) for all connected devices (see their

respective data sheets).

NOTE: Wiringmustbeadequatetoavoid

excessivevoltagedroponlong

runs!Allowplentyof“cushion”in

measurementsAmetermaybetooslow

toregistertransientdipsorpeaksduring

startup.See Wiring Issues on page 39.

• Put the FlexStat on a backplate connected to a

(test) transformer with short wiring and no other

connected devices. If the FlexStat works with the

test transformer, the wiring and/or transformer

in its previous location is inadequate. If it does

not work with the test transformer, replace the

FlexStat.

• Put another FlexStat on the installed backplate,

and if the second FlexStat functions properly,

replace the rst FlexStat.

“SYSTEM ERROR” Is Displayed

NOTE: The next line is something like “CO2:

COMM ERROR,” and the buons have no

eect.

• Restart the FlexStat. (See Reseing the FlexStat

on page 26.) If the buons don’t function, carefully

remove the FlexStat cover from the backplate and

reinsert it (or cycle the power from the circuit

breaker).

CAUTION

The 6-external-input BAC-12xxxx/13xxxx/14xxxx

series are NOT COMPATIBLE WITH THE

BACKPLATES OF OLDER (3-external-input) BAC-

10000 Series FlexStats! If replacing an older

3-external-input FlexStat, replace the backplate as

well.

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Kmc-controls FlexStat Operation Guide User Manual Page 32

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