Model: CDU-LCD
Doc. Ref. no.:- mMP/om/601
Issue no. 00.06
User’s Manual
Page 29 of 32
10.3 Buzzer & LED Status with respect to AHU Status
AHU Status
Alarm
Status
External/Internal
Buzzer(Audio) Status
External LED(Visual) Status
Without Pressing
ACK Button
With Pressing
ACK Button
Without Pressing
ACK Button
With Pressing ACK
Button
OFF
Unhealthy
OFF
OFF
Blinking
Steady ON
OFF
Healthy
OFF
OFF
Off
Off
ON
Unhealthy
ON
OFF
Blinking
Steady ON
ON
Healthy
OFF
OFF
Off
Off
TRIP
Unhealthy
ON
OFF
Blinking
Steady ON
TRIP
Healthy
ON
OFF
Off
Off
11. FAQ
1.
When CDU will Display “OVER” Message?
Over Message will only be displayed only in case of Differential Pressure input
if Differential Pressure is greater than Differential Pressure high range unit will
display “over” with red font.
2. Why time synchronization is required?
To avoid data mismatch between SCADA and CDU.
3. How to know that connection is break between CDU and Sensor?
If the Sensor (Remote Sensor for RH+T, Inbuilt Sensor for Differential
Pressure) will no response for 10 Sec parameter will start blinking and
parameter value will be set as per sensor break.
4. What will happen after connection is established from connection lost
between SCADA and CDU?
Logged data will be retrieved first and then it will update set point, band and
other parameters, as well as live data frame.
5. What will happen with the data when the connection break between SCADA
and CDU?
Data will be saved in memory of CDU that is called as logging of data.
6. What is band?
Band is defined as the exception for data logging to save the memory during
connection break with SCADA.
For example if the value of band is set as 1.0 from menu parameter setting.
If PV = 2 than CDU will log the data, if PV is >= 3(PV + BAND) or PV is <= 1
(PV - BAND).
7. How to know that the memory is full in CDU?
