Danfoss Metasys N2 Programming Guide

The dierence between the reference power at xed speed and the actual power yielded with speed control represent the
actual saving.
As value for the xed speed case, the rated motor size (kW) is multiplied with a factor (set in %) representing the power
produced at xed speed. The dierence between this reference power and the actual power is accumulated and stored. The
dierence in energy can be read in parameter 23-83 Energy Savings.
The accumulated value for the dierence 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=
∑
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
parameter 23-80 Power Reference Factor to 0.
Parameter for settings Parameters for readout
Rated motor power
Parameter 1-20 Motor Power [kW]
Energy savings Parameter 23-83 Energy Savings
Power reference factor in %
Parameter 23-80 Power Reference
Factor
Actual power Parameter 16-10 Power [kW],
parameter 16-11 Power [hp]
Energy cost per kWh
Parameter 23-81 Energy Cost
Cost savings Parameter 23-84 Cost Savings
Investment
Parameter 23-82 Investment
Table 3.26 Parameter Overview
23-80 Power Reference Factor
Range: Function:
100
%*
[0 -
100 %]
Set the percentage of the rated motor size (set
in parameter 1-20 Motor Power [kW] or
parameter 1-21 Motor Power [HP]), which should
represent the average power yielded at the time
running with xed speed (before upgrade with
variable speed control).
Must be set to a value dierent 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 impacts 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
parameter 23-81 Energy Cost.
23-83 Energy Savings
Range: Function:
0 kWh* [0 - 0
kWh]
This parameter allows a readout of the
accumulated dierence between the reference
power and the actual output power.
If motor size is set in hp
(parameter 1-21 Motor Power [HP]), the
equivalent kW value is 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 Descriptions Programming Guide
MG11CE02 Danfoss A/S © 03/2015 All rights reserved. 183
3 3

Danfoss Metasys N2 Specifications

General

Brand	Danfoss
Model	Metasys N2
Category	DC Drives
Language	English