Operation
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D000044352 en g – E230 Residential Electricity Meter – ZxR100xC/ZMR100xR – User Manual
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For total maximum demand, the recording can either start on power up
or not until the first one of these boundaries occurs. In the former case,
the demand is calculated by integrating the recorded value over the full
period (assuming the rest of the period to be 0).
During each integration period, a rising demand is calculated. This rising
demand is what the demand will be if there is no further energy
consumption within the current MD period.
Each time the demand is calculated the value is compared to the
respective current largest demand, and if it is larger, the new value is
written to the register.
6.7.2 ‘Rolling’ maximum demand
Rolling Maximum Demand is always calculated over a period of 15
minutes. The demand is calculated every minute using readings from the
last 15 minutes. The first calculation occurs 15 minutes after power up.
Each time the demand is calculated, the value is compared to the
respective current largest demand, and if it is larger, the new value is
written to the register.
When Rolling Maximum Demand is used, it is not possible to trigger rate
switching from an MD activity.
6.7.3 Maximum demand at power fail
If ‘slab’ MD and partial MD periods are enabled when the power is
removed from the meter and then restored, the meter restores the
values from the partial period and integrates that as if it were the total
energy used over the complete period.
6.7.4 Reset of maximum demand
There are two available methods of resetting maximum demand:
Formatted Command via optical port and MD Push Button.
Optical port formatted command
The Maximum Demand registers can be reset via the optical port by
formatted command using .MAP110.
MD push button
If the meter is fitted with a Maximum Demand push button, pressing the
button for > 3 seconds will reset the MD registers. Once the button is
pressed, the button is not active (for further MD resets) until a new MD
period has elapsed.
Resetting the maximum demand registers causes the following:
MD reset count is incremented by one
Display shows ‘rSt PASS’ to indicate successful acknowledgement
of a manual reset. (If manual reset is not successful, the display will
show ‘rSt FAIL’).
