Danfoss VLT FC 103 Programming Manual page 150

Parameter Description
23-67 Reset Timed Bin Data
Option: Function:
Select [1] Do reset to reset all counters in
23-62 Timed Bin Data.
After pressing [OK] the setting of the
parameter value will automatically change to
[0] Do not reset.
[0] Do not reset
[1] Do reset
3.18.7 23-8* Payback counter
The VLT Refrigeration Drive FC 103 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 saving by changing from
fixed to variable speed control. Reference for the savings is
a set value to represent the average power yielded before
the upgrade with variable speed control.
P
Illustration 3.61
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
23-83 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 23-84 Cost Savings.
{
t
∑
Cost Savings = ( 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.
®
VLT Refrigeration Drive Programming Guide
Rated power for the
motor size used
(P 1-20/21)
Reference power
(at xed speed)
(P 23-80)
Actual power yielded
with variable
speed control
(read P 16-10/11)
®
MG16H102 - VLT is a registered Danfoss trademark
Parameter for settings
1-20 Motor Power [kW] Energy Savings 23-83
23-80 Power Reference Factor Actual Power
23-81 Energy Cost Cost Savings
23-82 Investment
Table 3.27 Parameter overview
23-80 Power Reference Factor
Range: Function:
100 % [0 - 100 Set the percentage of the rated motor size
*
%] (set in 1-20 Motor Power [kW] or 1-21 Motor
Power [HP]) 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 [0 - 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 23-81 Energy
Cost.
23-83 Energy Savings
Range: Function:
0 kWh [0 - 0 This parameter allows a readout of the
*
kWh] accumulated difference between the
reference power and the actual output
power.
If motor size set in hp (1-21 Motor Power
[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).
Parameters for readout
16-10/16-11
23-84
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