Carrier /50HC 04-28, Управление, запуск, эксплуатация и устранение неисправностей, Страница: 67 / 144

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determine which one is having the problem. In test mode run
the components individually to determine which is causing the
problem. If the Shut Down on fan failure configuration is set to
Yes ( Configuration
→
OAU
→
OAU.F = Yes ), the ERV will
shutdown with this alarm active. If set to no, the ERV will con-
tinue to run as if the alarm did not occur, outside air CFM, ex-
haust CFM, or pre-conditions might not be achievable if a mo-
tor fails. The two classes of motor status are explained below.
Intake and Exhaust Motor Status
If any one of the ERV’s outside or exhaust motors detects a
problem, it will close its build in normally open alarm contact,
which will be seen as 24vac at EXCB J8-3. The EXCB’s D18
LED will be turn on and the OAU Motor Failure Alarm point
will be turned to on ( Operating Modes
→
OAU
→
ALM.1 =
On ). This alarm will automatically reset when the motor opens
its alarm relay. This alarm is tripped by one of the following:
phase loss, locked rotor, thermal overload, communication er-
ror, incorrect signal, or a fan failure.
Wheel Status
This alarm will occur when the ERV wheel is turned on and the
wheel proxy sensor does not detect wheel motion within the set
time. It will open its contact which energizes the normally
closed rotation monitor relay. This is seen as 24vac at EXCB
J5-3 and causes the alarm. The EXCB’s D12 LED will be
turned on and the OAU Motor Failure Alarm point will be
turned to on ( Operating Modes
→
OAU
→
ALM.1 = On ).
This alarm will automatically reset when motion is detected.
Possible causes of this alarm are: the wheel belt breaking or
slipping, wheel motor failure, proxy sensor failure or incorrect
setting, or wiring error.
T418 OAU LOW CFM
This alarm indicates that the ERV cannot bring in the desired
amount of outside air. The alarm occurs when the actual out-
side air CFM ( Operating Modes
→
OAU
→
A.OA ) is less than
10% of the commanded outside air CFM ( Operating Modes
→
OAU
→
C.OA ) after 10 minutes. This alarm will not occur
in test mode or defrost mode. The Rooftop unit might be able
to help by ramping its indoor fan up. Refer to the base controls,
start up, operation, and troubleshooting manual for details. The
OAU Low CFM Alarm point will be turned to on ( Operating
Modes
→
OAU
→
ALM.3 = On ). This alarm will automatical-
ly reset if the actual CFM is within 10% of the commanded
CFM. Possible causes of this are: outside air CFM setpoint set
too high, dirty filter or plugged screen, pressure tubing wrong
or disconnected, wrong OA CFM curve programmed, or RTU
indoor fan speed running too low.
T418 OAU GENERAL ALARM
This alarm is not currently used by the ERV.
Check Diagnostic LEDs
Use the on board LEDs to assist in troubleshooting the Ener-
gyX
®
system. The EnergyX Control Board (EXCB) and the
Universal Protocol Converter (UPC) each have LEDs that can
help in the troubleshooting process. See Tables 25-27.
The EXCB has five green LEDs and one red LED. The red LED
is for power indication and the green LEDs are status indicators.
The UPC has seven LEDs. There are four communication
LEDs and three status LEDs. The communication LEDs indi-
cate if the translator is speaking to the devices on the network
and should reflect communication traffic based on the baud
rate set. The higher the baud rate, the LEDs would become
more solid.
* Modbus is a registered trademark of Schneider Electric.
Table 25 — EXCB LED Indicators
LED COLOR DESCRIPTION
STATUS IF LIGHT
IS LIT
D9 Red 24vAC board power Board has power
D2 Green Run light Flashing ERV is Running
D12 Green ERV Wheel Status Alarm
ERV Wheel not
rotating when it
should be
D14 Green
ERV Wheel Frost
Protection
ERV detects frost on
the wheel and
running in Frost
Mode
D16 Green ERV Dirty Filter Alarm Dirty Filter
D18 Green ERV Blower Status Alarm Fan Failure
Table 26 — EXUPC LED Indicators
LED COLOR DESCRIPTION STATUS IF LIGHT IS LIT
Power Green Power Indicator
Lights when power is being
supplied to the translator.
Rx1 Green
Port 1 Receiving
Data
Lights when the translator
receives data from
Comfort Link MBB via LEN
Rx2 Green
Port 2 Receiving
Data
Lights when the translator
receives data from the
Modbus* EXCB
Tx1 Green
Port 1
Transmitting Data
Lights when the translator
transmits data to the
Comfort Link MBB via LEN
Tx2 Green
Port 2
Transmitting Data
Lights when the translator
transmits data to the Modbus
EXCB
Run Green Run indicator
Lights based on translator
health. See Table 27.
Error Red
Internal Error
indicator
Lights based on translator
health, See Table 27.
Table 27 — EXUPC LED Flash Code Diagnostics
Run LED Status
Error LED
Status
ERV Module Status
2 flashes per second
Off Normal
2 flashes,
alternating with
Run LED
5 minute auto - restart delay
after system error
3 flashes then off Module has just been
formatted
4 flashes then
pause
Two or more devices on this
network have the same
ARC156 network address
1 flash per
second
Module is alone on the network
On
Operation halted after frequent
system errors or control
programs halted
5 flashes per second
On
Operation start - up aborted.
Boot is running
Off
Firmware transfer in progress.
Boot is running
7 flashes per second
7 flashes per
second,
alternating with
Run LED
Ten second recovery period
after brownout
14 flashes per
second
14 flashes per
second,
alternating with
Run LED
Brownout
Alternating with
Error
Alternating with
Run
Restoring memory from
Archive