AAON VCCX2 User Manual

57VCCX2 Controller Technical Guide
TROUBLESHOOTING
LED Diagnostics
VCCX2 Controller LEDs
The VCCX2 Controller is equipped with LEDs that can be used
to verify operation and perform troubleshooting. There are LEDs
for communication, operation modes, and diagnostic codes. The
VCCX2 Controller has 26 LEDs—10 used for operation and status,
eight are used for relays, and eight are used for binary inputs. The
LEDs associated with these inputs and outputs show what is active
without using a voltmeter. The LEDs and their uses are as follows:
Operation LEDs - Factory Troubleshooting
POWER - This green LED lights up to indicate that 24 VAC power
has been applied to the controller.
APP HB - This green LED lights up and blinks continuously to
indicate the application software is working properly.
OS HB - This green LED lights up and blinks continuously to
indicate the operating system is working properly.
WDOG - This green LED lights up and stays lit to indicate the
operating system is working properly.
Diagnostic LEDs
ALARM - This red LED is a diagnostic blink code LED. It lights
up and stays lit when there is an alarm present. The type of alarm
displays on the LCD display.
STATUS 1 - This red LED is a diagnostic blink code LED. Under
normal operation, it should not be blinking. If the LED is blinking
non-stop along with Status 2 LED, the controller is resetting to
factory defaults.
STATUS 2 - This red LED is a diagnostic blink code LED. If the
software is running, this LED should blink at a rate of one blink
every 10 seconds. If there is an override, the LED blinks two times
every 10 seconds. And nally, if one of the outputs is in Force Mode,
the LED blinks three times every 10 seconds.
Communication LEDs
EBUS - This yellow LED blinks to signal E-BUS communications.
LOOP COMM - This yellow LED lights up and blinks continuously
to indicate the VCCX2 Controller is communicating.
BACnet- This yellow LED lights up and blinks continuously to
indicate BACnet communications.
Relay LEDs
RLY1 - This green LED lights up when the supply fan is enabled
and stays lit as long as the supply fan is active.
RLY2 - RLY8 - These green LEDs light up when the relays are
enabled and stay lit as long as they are active.
Binary Input LEDs
BI1 - This green LED lights up when the proof of ow contact is
closed.
BI2 - This green LED lights up when the dirty lter switch is closed.
BI3 - This green LED lights up when the hood on/o switch is closed.
BI4 - This green LED lights up when the remote occupied switch
is closed.
BI5 - This green LED lights up when the remote cooling contact
is closed.
BI6 - This green LED lights up when the remote heating switch
is closed.
BI7 - This green LED lights up when the remote dehumidication
switch is closed.
BI8 - This green LED lights up when the emergency shutdown
contact is closed.
VCC-X EM1 Expansion Module LEDs
The VCC-X EM1 Expansion Module is equipped with four LEDs
that can be used as troubleshooting tools. The LEDs and their uses
are as follows:
PWR - This LED lights up to indicate that 24 VAC power has been
applied to the controller.
ALARM - If the module does not receive communications for more
than one minute, this LED lights up, the relays turn o, and the
Analog Outputs go to 0 VDC.
STAT - If the software is running, this LED blinks at a rate of one
blink per second.
COMM - Every time the module receives a valid E-BUS request from
the VCCX2 Controller, this LED blinks on and then o, indicating
it received a valid request and responded.
Binary Input LEDs
BI1 - This green LED lights up when the return/exhaust proof of
ow contact is closed.

AAON VCCX2 Specifications

General

Brand	AAON
Model	VCCX2
Category	Controller
Language	English