10
2) Apply Power
Apply power to the VWG by plugging in the power plug into either the VWG (if wall mount AC adapter VWG-PS-
AC) or the 24Vac-powered VWG-PS-DC module.
3) Check the Status LEDs
When power is applied, the green LED labeled
“SYS”
will light. This is a green LED. Once the VWG boots, the yellow
“BEAT”
(heartbeat) LED will begin blinking, with a typical rate of about 1 Hz. Boot time should begin within 30 seconds
after power is applied.
The blink pattern of the heartbeat LED under normal operation will differ for each installation (depending on station
activity). But, in general, the LED should blink about once per second. The rate will be slower when the control engine is
executing the station database, and as more objects / wireless thermostats are added.
After applying power, if the heartbeat LED comes on (steady) and stays lit longer than two minutes, contact technical
support for assistance. See also the “Using Status LEDs” section.
About the Battery
The VWG is provided with a custom 10-cell NiMH battery pack mounted to the unit (under the cover). This battery
allows the VWG to continue operation through very short power bumps (a few seconds in duration). If a longer power
outage occurs, the battery provides enough run time for the VWG to backup data and then shutdown. Typically, this is
one minute. Shutdown occurs automatically, after data is backed up to on-board flash memory.
The battery is trickle-charged by the VWG during normal operation. Following an extended power outage, the battery is
charged at a faster rate. The power and battery circuitry is monitored by the VWG. The battery should be replaced
approximately every three years, or more often if the unit is in a high temperature environment.
Note
A NiMH battery characteristic is to lose charge if not left in charge mode (trickle charge). Leaving the battery
unconnected, or in the unit powered off will cause the battery to fully discharge in a matter of weeks. Note that
in the case of a new VWG, it ships from the factory with a completely discharged battery. Therefore, allow at
least 18 hours for the battery to charge if it has not been in a powered unit.
For more information on the use and replacement of the battery, refer to the “Required Battery Maintenance” section.
Related Documentation
For more information on configuring and using the VWG controller, consult the following documents available from the
VWG section at
www.viconics.com
:
•
Gateway BACnet integration guide (VWG-40-BIP & VWG-40-MSTP), is available in document ITG-VWG-40-BAC-Exx
•
Information on design consideration of wireless mesh networks and VWG set-up / diagnostics is available in document LIT-
VWG-40-SETUP-Exx
