GE Ecomagination AF-600 FP Programming Manual page 153

Parameter Description
T-66 Reset Continuous Bin Data
Option:
[0] Do not
*
reset
3 3
[1] Do reset
3.21.5 T-8# Payback Counter
The frequency converter includes a feature which can give a rough calculation on payback in cases where the frequency
converter has been installed in an existing plant to ensure energy savings. Reference for the savings is a set value to
represent the average power yielded before the upgrade with variable speed control.
Illustration 3.55 Variable Speed Control
The difference between the reference power at fixed speed and the actual power yielded with speed control represent the
actual saving.
As value for the fixed speed case, the rated motor size (kW) is multiplied with a factor (set in %) representing the power
produced at fixed speed. The difference between this reference power and the actual power is accumulated and stored. The
difference in energy can be read in parameter T-83 Energy Savings.
The accumulated value for the difference in power consumption is multiplied with the energy cost in local currency and the
investment is subtracted. This calculation for cost savings can also be read in parameter T-84 Cost Savings.
Cost Savings =
t
∑ Rated Motor Power ∗ Power Reference Factor
t = 0
− Actual Power Consumption × Energy Cost
− Investment Cost
Break even (payback) occurs when the value read in the parameter turns from negative to positive.
It is not possible to reset the energy savings counter, but the counter can be stopped any time by setting
parameter T-80 Power Reference Factor to 0.
Rated motor power
Power reference factor in %
Energy cost per kWh
Investment
Table 3.26 Parameter Overview
152
Function:
Select [1] Do reset to reset all values in
parameter T-61 Continuous Bin Data. After
pressing [OK], the setting of the parameter
value automatically changes to [0] Do not reset.
Parameter for settings
Parameter P-07 Motor Power [kW]
Parameter T-80 Power Reference
Factor
Parameter T-81 Energy Cost
Parameter T-82 Investment
T-67 Reset Timed Bin Data
Option:
[0] Do not
*
reset
[1] Do reset
Energy savings
Actual power
Cost savings
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Function:
Select [1] Do reset to reset all counters in
parameter T-62 Timed Bin Data.
After pressing [OK], the setting of the
parameter value automatically changes to [0]
Do not reset.
Parameters for readout
Parameter T-83 Energy Savings
Parameter DR-10 Power [kW],
parameter DR-11 Power [hp]
Parameter T-84 Cost Savings
DET-620D