Huawei NetCol5000-C030H90D0 User Manual page 135

NetCol5000-C(030, 032, 065) In-row Chilled Water
Smart Cooling Product
User Manual (2019)
Alar
m ID
A003
A007
Issue 03 (2020-08-30)
Alarm Alarm
Name Severi
ty
Return air WARNI
low NG
temperature
alarm
Return air 1 MAJO
temp/humid R
sensor
comm failed
Return air 2
temp/humid
sensor
comm failed
Cold aisle 1
temp/humid
sensor
comm failed
Copyright © Huawei Technologies Co., Ltd.
6 System Operation and Maintenance
Possible Cause
1. The temperature
sensors or
temperature and
humidity sensors are
located in
inappropriate
positions.
2. The thermal load
power is low.
3. The ambient
temperature is
below the lower
threshold.
4. The low
temperature alarm
threshold is
inappropriate.
5. The value
detected by the
temperature sensor
or temperature and
humidity sensor is
different from the
actual value.
6. The air filters are
blocked.
7. The chilled water
valve is stuck or
faulty.
1. The cables to the
temperature and
humidity sensor are
loose or damaged.
2. The DIP switch of
the temperature and
humidity sensor is
set incorrectly.
3. The temperature
and humidity sensor
is faulty.
4. The
communications
port of the main
control board is
faulty.
Solution
1. Adjust the positions
of the temperature
sensors or temperature
and humidity sensors.
2. Contact Huawei
technical support.
3. Measure the ambient
temperature. Check
whether other causes
exist if the alarm
persists in a long time
after startup.
4. Adjust the low
temperature alarm
threshold.
5. Calibrate or replace
the temperature sensor
or temperature and
humidity sensor.
6. Maintain or replace
the air filters.
7. Maintain or replace
the chilled water valve.
1. Check the cables to
the temperature and
humidity sensor.
2. Set the DIP switch of
the temperature and
humidity sensor
correctly.
3. Maintain or replace
the temperature and
humidity sensor.
4. Maintain or replace
the main control board.
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