Danfoss VLT AQUA Drive FC 200 Programming Manual page 163

Parameter Description
23-66 Reset Continuous Bin Data
Option:
[0] Do not reset Select [1] Do reset to reset all values in
*
3 3
[1] Do reset
23-67 Reset Timed Bin Data
Option:
[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 3.64
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
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.
Cost Savings = (∑ (Reference Power – Actual Power)) *
Energy Cost – Additional Cost
162
VLT
Function:
23-61 Continuous Bin Data. After pressing [OK]
the setting of the parameter value will
automatically change to [0] Do not reset.
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.
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)
MG20O602 - VLT
®
AQUA Drive Programming Guide
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
23-80 Power Reference Factor, to 0.
Rated Motor Power
Power Reference Factor in %
Energy Cost per kWh
Investment
Energy Savings
Energy Savings
Actual Power
Cost Savings
Table 3.28 Parameter Overview
23-80 Power Reference Factor
Range:
100 % [0 - 100
*
%]
23-81 Energy Cost
Range:
1.00 [0.00 -
*
999999.99 ]
23-82 Investment
Range:
0 [0 - 999999999 ] Set the value of the investment spent on
*
23-83 Energy Savings
Range:
0 kWh [0 - 0
*
kWh]
®
is a registered Danfoss trademark
Parameter for settings
1-20 Motor Power [kW]
23-80 Power Reference Factor
23-81 Energy Cost
23-82 Investment
Parameters for readout
23-83 Energy Savings
23-83 Energy Savings
16-10 Power [kW]/16-11 Power
[hp]
23-84 Cost Savings
Function:
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.
Function:
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.
Function:
upgrading the plant with speed control,
in same currency as used in 23-81 Energy
Cost.
Function:
This parameter allows a readout of the
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.