Nortec Industries NHTC Series - Manual (Page 33)

10-30
Page 6
2008-02-18
Table 3. Troubleshooting Communication Problems
Problem Solution
1. The BMS network cannot
read/write any information to any of
the networked humidifiers Verify that the network connection is made and is connected properly.
Verify that the correct network settings are being used. The LINKS 2 module
may need to be restarted to load the new settings.
Check the Serial Port Activity LED on the Nortec OnLine module to ensure
proper communication with the humidifiers. Data is first received from the
humidifier to the OnLine module. The OnLine module then transmits this
data, via the Ethernet port, to the LINKS 2 module.
Check the Ethernet port activity on the LINKS 2 module to ensure it is
receiving data from the Nortec OnLine module.
Check the transmit and receive status LEDs to determine if there is any
network traffic being sent or being received by the LINKS 2 module from the
BMS network
Verify proper connections to networked humidifiers.
Turn the LINKS 2 module and the OnLine module off for several seconds
then switch it back on to reload the control program. Allow for some time for
the network variables to be polled.
2. The BMS network can see some
of the networked humidifiers but not
others. Ensure network variables are mapped correctly to the BMS.
Ensure proper connections to the humidifiers.
Disconnect all of the humidifiers from the LINKS 2 package except for the unit
that is not responding to the network. Turn the LINKS 2 package off and then
back on. Check if the humidifier can now be seen by the BMS
3. The BMS network receives
information from the networked
humidifier(s) but the information is
mismatched or the humidifier
responds un-expectedly Verify that the network variables have been mapped to the BMS network
correctly. It is possible that the variables have been cross-linked during the
network integration process.
Connect humidifiers one at a time and test units individually.
4. After sending the humidifier a
network-based demand signal the
unit powers down after several
minutes. The nviNetSensor variable
is switched on and a value has been
set for the nviRHDem1 variable. When a BMS network demand/RH signal is being used the network must
refresh the nviRHDem signal at least every 5 minutes otherwise the
humidifier will revert to a 0 demand state. This is a safety precaution in case
the BMS network connection is lost.