23-67 Reset Timed Bin Data
Option:
Function:
Select
[1] Do reset
to reset all counters in
.
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.
130BA259.11
P
Actual power yielded
with variable
speed control
(read P 16-10/11)
Reference power
(at fixed speed)
(P 23-80)
Rated power for the
motor size used
(P 1-20/21)
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
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
.
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.
Parameter for settings
Parameters for readout
Energy Savings 23-83
23-80 Power Reference Factor Actual Power
16-10/16-11
Cost Savings
23-84
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
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
*
[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
23-83 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
®
Refrigeration Drive Programming Guide
MG16H102 - VLT
®
is a registered Danfoss trademark
149
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