Danfoss VLT AQUA Drive FC 202 Programming Manual page 172

Parameter Description
23-67 Reset Timed Bin Data
Option:
3 3
[0] Do not
reset
[1] Do reset
3.20.5 23-8* Payback counter
®
The VLT AQUA Drive 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 3.70 Comparison of the Reference Power and
Actual Power
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 yielded 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 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 parameter 23-84 Cost
Savings.
Cost Savings = (∑ (Reference Power – Actual Power)) *
Energy Cost – Additional Cost
Break even (payback) occurs when the value read in the
parameter turns from negative to positive.
170
Programming Guide
Function:
Select [1] Do reset to reset all counters in
parameter 23-62 Timed Bin Data.
After pressing [OK] the setting of the parameter
value automatically changes to [0] Do not reset.
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)
Danfoss A/S © Rev. 2014-01-21 All rights reserved.
It is not possible to reset the energy savings counter, but
the counter can be stopped any time by setting
parameter 23-80 Power Reference Factor, to 0.
Parameter for settings
Rated Motor Power
Power Reference Factor in %
Energy Cost per kWh
Investment
Parameters for readout
Energy Savings
Actual Power
Cost Savings
Table 3.23 Parameter Overview
23-80 Power Reference Factor
Range: Function:
100 [0 - Set the percentage of the rated motor size (set
% 100 %] in parameter 1-20 Motor Power [kW] or
*
parameter 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 - Set the value of the investment spent on
*
999999999 ] upgrading the plant with speed control, in
same currency as used in
parameter 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 (parameter 1-21 Motor
Power [HP]), the equivalent kW value is used
for the energy savings.
1-20 Motor Power [kW]
Parameter 23-80 Power
Reference Factor
Parameter 23-81 Energy Cost
Parameter 23-82 Investment
Parameter 23-83 Energy
Savings
Parameter 16-10 Power [kW]/
parameter 16-11 Power [hp]
Parameter 23-84 Cost Savings
MG20O702