E-Clipse Bypass Configurations for ACH550 Drives 43
Overview of Bypass Functionality
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
2
avoidance in tons.
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
2
Saved calculation is a constant (0.5 tons per megawatt-hour) times the energy
saved. The CO
2
Saved estimate is displayed in tons of CO
2
(tn) in Parameter 0116 (CO2
SAVED). Since the application uses less energy in drive mode, less CO
2
is generated by
the power plant supplying power to the site.
Energy Saving Estimator Setup
Verify the connected equipment is ready for operation. Set the following Parameters:
• Parameter 1627 - set to local cost of energy in cents per kilowatt hours
• Parameter 1629 - set to desired hours of initial bypass operation to establish
energy usage baseline
• Select Bypass Mode on E-Clipse Keypad
• Parameter 1628 – set to ENABLED
•Start Bypass
• Run Bypass for at least the LEARN TIME set in Parameter 1629
• Select Drive Mode on E-Clipse Keypad
• Operate System normally
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