Cost Savings =
{
∑
t=0
t
(
Rated Motor Power ∗ Power Reference Factor
)
−
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
to 0.
Parameter overview:
Parameter for settings
Parameters for readout
Rated Motor Power
Energy Savings
Power Reference Factor in %
Actual Power
,
Energy Cost per kWh
Cost Savings
Investment
23-80 Power Reference Factor
Range:
Function:
100 %
*
[0 - 100
%]
Set the percentage of the rated motor size (set
in
or
) which is supposed to represent the
average power yielded at the time running
with fixed speed (before upgrade with variable
speed control).
Must be set to a value different from zero to
start counting.
23-81 Energy Cost
Range:
Function:
1.00
*
[0.00 -
999999.99 ]
Set the actual cost for a kWh in local
currency. If the energy cost is changed
later on it will impact the calculation for
the entire period.
23-82 Investment
Range:
Function:
0
*
[0 - 999999999 ] Set the value of the investment spent on
upgrading the plant with speed control, in
same currency as used in
.
23-83 Energy Savings
Range:
Function:
0 kWh
*
[0 - 0
kWh]
This parameter allows a readout of the
accumulated difference between the
reference power and the actual output
power.
If motor size set in Hp (
), the equivalent kW value will be used for
the Energy Savings.
23-84 Cost Savings
Range:
Function:
0
*
[0 - 2147483647 ] This parameter allows a readout of the
calculation based on the above equation
(in local currency).
Parameter Description
VLT
®
HVAC Drive Programming Guide
MG.11.CB.02 - VLT
®
is a registered Danfoss trademark
161
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