ABB ACH550-UH User Manual page 396

2-50
Energy Savings Estimator
The ABB E-Clipse Bypass is capable of displaying the estimated energy savings
provided by variable frequency drive operation. Additional displays provide
estimated dollar savings based upon a user provided cost per kilowatt hour and
estimated CO
The Energy Savings Estimator feature is activated by enabling the Learn Mode in
Parameter 1628 (LEARN MODE). Learn Mode should be activated on a day with
typical ambient conditions for best accuracy. For an air conditioning application, if
ambient conditions are hotter than normal when Learn Mode is activated; the
calculations may estimate more energy savings than actual. Conversely, if Learn
Mode is activated when ambient conditions are colder than normal; the calculations
may estimate less energy savings than actual. Once the Learn Mode is enabled, the
E-Clipse Bypass will keep a running tally of the energy used to run the application for
the length of time defined in Parameter 1629. This energy usage becomes the base
line for energy savings calculations on this application.
The user can adjust the default Learn Time (48 hours) by adjusting Parameter 1629
(LEARN TIME). The minimum Learn Time setting is 6 minutes (0.1 hour) and the
maximum Learn Time setting is 200 hours. It is recommended that the E-Clipse
Bypass run in Learn Mode for at least 24 hours for increased accuracy.
The MWh Saved estimation is displayed in megawatt hours in Parameter 0114
(MWH).
The Cost Saved calculation is simply the user provided cost per kilowatt hour in
cents per kilowatt hour from Parameter 1627 (COST/KWH), times the energy saved.
The Cost Saved estimate is displayed in thousands of dollars (K$) in Parameter
0115 (COST SAVED).
The CO
energy saved. The CO
Parameter 0116 (CO
mode, less CO
Bypass functions overview
avoidance in tons.
2
Saved calculation is a constant (0.5 tons per megawatt-hour) times the
2
Saved estimate is displayed in tons of CO
2
SAVED). Since the application uses less energy in drive
2
is generated by the power plant supplying power to the site.
2
ACH550 E-Clipse Bypass User's Manual
2
(tn) in