Table of Contents
Advertisement
power from all compressors in the chiller. This value is
integrated over an hour period to provide Hourly Usage.
The Hourly Usage value is totalized daily for the data
logging report (resets at midnight) into Daily Usage
variable.
Also at midnight it adds up to both monthly variable
Monthly Usage and total variable Total Usage. Monthly
st
Usage resets on the 1
day of the month at midnight.
Total Usage however does not reset ever unless button
Reset kWh is pressed. This button is available at Main
Menu > Settings Menu > HMI button > Admin
Parameters button and can be accessed by Admin user
only.
Beside the Total Usage variable there is the date which
indicates when Total Usage kWh count started. When
Total Usage kWh count starts over after being reset, the
date updates as well.
Tonnage
To display tonnage and flow:
1. Navigate to HMI Configuration screen.
2. Change Flow Metering mode to one of the options,
see below. This will expose corresponding controls on
Chiller Control screen.
Figure 26. Flow Metering
3. Flow Metering source options:
a. User Entered – Provides Chiller Flow Rate data
entry on the Chiller Control screen. Enter a
theoretical flow value for the chiller.
Figure 27. Chiller Flow Rate
Note: The tonnage display will also reflect this
theoretical value.
b. Flow Meter – relies on Main PLC analog input to
have a calibrated flow rate for the chiller.
1. Enter the Flow Meter Maximum value on the
Chiller.
Figure 28. Flow Meter Maximum
2. Control screen.
3. Differential Pressure– relies on 2 pressure
sensors; one inlet and one outlet connected to
Main PLC. Provides the following additional
ARTC-SVX007A-EN
fields:
•
Nominal flow – enter the design 100% load
flow rate.
•
Nominal Differential pressure – enter the
DP reading for 100% design flow rate.
•
Evaporator Flow Threshold – enter
minimum value of DP that is considered a
flow proof.
•
Actual DP displays the difference between
Entering and Leaving fluid pressures.
•
Actual Flow displays the results of the
internal calculation based on measured DP.
4. Enter Fluid Compensation Factor on the Chiller
Control screen if the fluid used is not water.
Figure 29. Fluid Compensation Factor
Metric/Imperial Display
The System allows you to customize your display to suit
your environment. Whether you prefer to see data in
imperial or metric units, it is a single click of a button:
1. Navigate to the HMI Configuration screen – Main
Menu > Settings Menu > HMI button.
2. Toggle the Display Imperial button.
a. Button display current setting.
Figure 30. Display imperial button
Operating Procedures
39
Advertisement
Table of Contents
