45
Table10 – LEDs
The LEDs on the RTUOpen Control Board (see Fig. 57) show the status of certain functions:
Ifthis LED is on... Statusis...
Power RTU Open has power
Rx RTU Open is receiving data from the network segment
Tx RTU Open is transmitting data over the network segment
DO# Thedigital output is active
TheRun and Error LE Ds indicatecontrol module and network status
If Run LED shows... And Error LED shows... Statusis...
2flashes p er second Off Normal
2flashes p er second 2flashes,
alternatingwith Run LED Five m inuteauto ---restartdelay after system error
2flashes p er second 3flashes,
then off Controlmodule has just been formatted
2flashes p er second 4flashes,
then pause
Twoor more devices on thi s network have the
same ARC156 network address
2flashes p er second On Exec halted after frequent system errors or
controlprogra ms halted
5flashes p er second On Exec start---up aborted, Boot is running
5flashes p er second Off Firmware transfer in progress, Boot is running
7flashes p er second 7 flashes per second, alternating with
Run LED Tensecond recovery period after brownout
14flashes per second 14flashesper second,
alternatingwith Run LED Brown out
On On
Failure.Try the following solutions:
STurnRTUOpenoff,thenon.
SFormat RTU Open.
SDownloadmemory to RTU Open.
SReplaceRTU Open.
NOTE: Refer to Catalog No. 48--50HCTQ--01T for
complete configuration of RTU Open, operating sequences
and troubleshooting information. Refer to RTU Open
Controller Integration Guide (Catalog No. 11--808--428--01)
for details on configuration and troubleshooting of connecte d
networks. Have a copy of these manuals available at unit
start--up.
Outdoor Air Enthalpy Control(PNO 33CSENTHSW)The enthalpy control (33CSENTHSW) is available as a
field--installedaccessory to be used with the EconoMi$er2
damper system. The outdoor air enthalpy sensor is part of
the enthalpy control. (The separate field--installed
accessory return air enthalpy sensor (33CSENTSEN)is
required for differential enthalpy control. See Fig. 71.)
Locate the enthalpy control in the economizer next to the
Actuator Motor. Locate two GRA leads in the factory
harness and connect the gray lead labeled “ESL” to the
terminal labeled “LOW”. See Fig. 71. Connect the
enthalpy control power input terminals to economizer
actuator power leads RED (connect to 24V) and BLK
(connect to GND).
7CTB ECON
(P’LINK: to J4-2) or
(RTU Open: to J2-6)
LOW
GND
24V
Enthalpy
Switch
GRA
BLK
RED
Factory Wiring Harness
PL6-1 (24-V)
PL6-4 (COM)
C11160
Fig. 7 1 --Enthalpy Swi tch (33CSENTHSW) Connections
The outdoor enthalpy changeover setpoint is set at the
enthalpy controller.
Differential Enthalpy Control —
Differential enthalpy control is provided by sensing and
comparing the outside air and return air enthalpy
conditions. Install the outdoor air enthalpy control as
described above. Add and install a return air enthalpy
sensor (see Fig. 72).
48HC