Danfoss AK-LM 330 Design Manual page 70

Consumption reading
This function registers the consumption of electricity, water, gas,
etc.
These readings are saved in the monitoring unit and can be re-
trieved later for presentation/analysis. An expansion module type
AK-XM 107A must be used. The module is a pulse counter module,
which measures pulses in accordance with DIN 43 864. Conver-
sion from, for example, current to pulses takes place in an energy
counter.
Energy counters can be divided into several groups, e.g. one main
meter and several ancillary meters.
The main meter measures all of the consumption for the installa-
tion. Some main meters are fitted with tariff and synchronisation
switches.
The AK-LM 330 can receive the synchronisation signal.
The synchronisation switch changes at regular intervals (typically
every 15 mins) and indicates that a new measurement period has
started.
Ancillary meters measure an element of consumption. It might be
interesting to know, for example, the freezer department's energy
consumption.
Measurement intervals for synchronisation are set jointly for all
energy meters.
If the synchronisation signal is not used, the monitoring unit will
define its own measurement period.
The monitoring unit supports up to four energy meters.
Each consumption meter has the following available functions:
• Name
• Start/stop of consumption measurement
• Setting the consumption measurement
• Setting the meter
• Selection of number of pulses per unit of measurement
• The conversion factor is defined as primary/secondary ratio
• Setting the consumption value, e.g. by installation of counter
In addition it is possible to read historical and current values:
• Total consumption (since start-up or reset the counter)
• Consumption for past week (from Monday at 0 until Sunday at
24 o'clock)
• Consumption for past day (from 0 to 24 o'clock)
• Current output (average power the last 60 seconds. Updated
every 5 seconds)
th
• Average output (average power in the measurement interval,
typically 15 minutes).
70 RS8FR302 © Danfoss 2015-08 AK-LM 330