Danfoss m2 User Manual

20 Manual RS.8A.N5.02 © Danfoss 10-2007 m2 Version 3.11
If the Pulsed Input is being setup via Danfoss Central Station software, there is
an extra eld named ‘Export’ that can be used.
This eld is set if the points data is to be exported to AKM format for analysis by
Power Focus or similar software.
The m2 Pulsed Input requires a volt free contact or an open collector and the
pusle width must be a minimum of 80 mS.
The Pulsed Input will operate with either PT1000 or Thermistor m2 input
boards.
The resolution of the pulse data depends on the sample rate of the m2 – the
longer the sample rate, the greater the resolution, as well as the resolution of
the power meter being used.
For example:
If the power meter outputs ve pulses for every Kilo Watt Hour (KWh) and with
a current usage of 6 KW.
With an m2 sample rate of 3 minutes:
1 or 2 pulses received per 3 minute interval ((5 pulses x 6 KWh) / 60 minutes) x 3
minutes = 1.5
1 pulse x 0.2KW x 20 (for 1 hour) = 4 KW
2 pulses x 0.2KW x 20 (for 1 hour) = 8 KW
Resolution is 4. Values could either be 0, 4, 8, 12 etc.
With an m2 sample rate of 15 minutes:
7 or 8 pulses received per 15 minute interval ((5 pulses x 6 KWh) / 60 minutes) x 15
minutes = 7.5
7 pulse x 0.2KW x 4 (for 1 hour) = 5.6KW
8 pulses x 0.2KW x 4 (for 1 hour) = 6.4KW
Resolution is 0.8. Values could be 0, 0.8, 1.6, 2.4, 3.2, 4.0, 4.8, 5.6, 6.4 etc.
With the Peak option, the sample rate is 1 minute (though the storage rate is
whatever the m2 is set for) which gives a very poor graph resolution, this makes
the Peak value very inaccurate unless the power meter outputs many pulses
per KWh.
This option allows the coordinated defrost setup of a network of EKC
controllers. From the Setup Menu, select the Defrost Schedule option.
Use the ‘↵’ to highlight the eld to be modied. Use the ‘ ’ and ‘ ’ keys to
scroll through the character or options list and the ‘ ’ and ‘ ’ keys to move the
cursor left or right respectively.
Set the values as follows:
Number Set this to the point number required for the defrost
schedule.
Name Enter the name required for this defrost schedule (this is
the point name).
Mode Select either ‘Master’ or ‘Follows’ depending on whether the
controller being setup is a ‘Main’ or ‘Secondary’ controller. If
‘Master’ has been set, then the next eld becomes active in
which the controllers address needs to be entered.
Coordinate This eld only becomes active if ‘Master’ is selected in the
previous eld. Select either ‘Yes’ or ‘No’ depending on if
the ‘Secondary’ controllers information is to be used for
end of defrost control.
Export
Pulsed Input Installation Notes
Resolution
Defrost Synchronisation

Danfoss m2 Specifications

General

Brand	Danfoss
Model	m2
Category	Control Systems
Language	English