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Troubleshooting
Alarm Issues
Alarm, (False) Fan Fail
• Check configuration. Be sure the Fan Status
option is not selected when there is no sensor/
switch for it.
• Check that the IN2 (fan status) input pull-up
resistor switches are fully latched in the correct
positions. Any passive, dry contact should use
the 10K Ohm setting. (See the Connections and
Wiring section of the relevant FlexStat Installa-
tion Guide.)
• Check IN2 (fan status) input wiring.
• Check the connected fan status sensor/switch.
• Using BACstage or TotalControl, check that AI2
(fan status) is not configured as "Out Of Service."
Alarm, (False) Low Limit (Freeze Stat)
•
Check the Low Limit Alarm setting—see Damper
Setup on page
7.
• Check configuration. Be sure the Economizer
option is not selected when there is no mixed air
temperature sensor.
• Check that the IN3 (mixed air temp.) input
pull-up resistor switches are fully latched in the
correct positions (see the Connections and Wir-
ing section of the relevant FlexStat Installation
Guide).
• Check IN3 (mixed air temperature) input wiring.
• Check the connected mixed air temperature sensor.
• Using BACstage or TotalControl, check that AI3
(mixed air temp.) is not configured as "Out Of
Service."
NOTE: After a low limit alarm is generated, the
fan will not run until after the FlexStat is
restarted. (See Resetting the FlexStat on
page
24.)
Alarm, (False) Space Temp. or Humidity
•
See Alarms on page
•
See Temperature Reading Is Incorrect on page
•
See Temperature Setpoint Is Not Maintained on
page
31.
• Using TotalControl, adjust the limits or time
delay.
FlexStat
21.
Communication Issues
NOTE: For a "COMM ERROR" on the display, see
(Advanced) CO2 Sensor (and DCV) on page
Ethernet/IP Network Communication Issues
•
Check communication settings—see (Advanced)
Communications (BACnet) on page
KMD-5576 (Data Port) Communication Issues
• For Ethernet-enabled models, a FlexStat in one of
the Ethernet or IP modes must (temporarily) be
set for MS/TP mode (and restarted) to commu-
nicate through the data port at the bottom of the
cover. See (Advanced) Communications (BACnet)
on page 14 and Resetting the FlexStat on page
• Upgrade to the latest version of BACstage (ver.
2.4.0.25 or later required).
• Check the settings for the USB port on the
computer (Device Manager > Ports) and the
MS/TP port in BACstage (Access > Connection
Parameters).
• Reduce the Max Master number down to the
minimum needed for that network—see (Ad-
vanced) Communications (BACnet) on page
• Install latest driver and check latency settings.
See Latency Settings for KMD-5576 Service Bul-
letin (SB0308A) on the KMC web site.
•
See also MS/TP Network Communication
below.
MS/TP Network Communication Issues
NOTE: In firmware R2.0.0.6 and later, Configure
must first be selected before any values
can be changed.
• Check MAC address and device instance num-
bers (especially for duplicate numbers on the
network)—see (Advanced) Communications
(BACnet) on page 14 and (Advanced) BACnet
Device Properties on page
• Check that EOL switches are fully latched in the
correct positions (see the relevant FlexStat Instal-
31.
lation Guide).
•
Check baud rate—see (Advanced) Communica-
tions (BACnet) on page
• Reduce the Max Master number down to the
minimum needed for that network—see (Ad-
vanced) Communications (BACnet) on page
•
See Wiring Issues on page
28
14
14.
Issues
16.
14.
14.
36.
Operation Guide, Rev. L
10.
24.
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Table of Contents
Troubleshooting
