Landis & Gyr Cashpower Gemini HMI User Manual - 7.4
20/35
Released
General Meter Operation
© Landis+Gyr (Pty) Ltd
Cashpower Gemini HMI
– User Guide
7.3.14 Set Energy Limiting Mode (Meter-Specific Token)
On accepting a set Energy Limiting mode token, the meter commences operation as described in
section 11.
7.3.15 Set DAE Value (Meter-Specific Token)
This function is only applicable when operating in Energy Limiting mode
– refer to section 7.4.
7.3.16 Force Load Switch Open (Meter-Specific Token)
This token provides a facility to independently disconnect the supply to the customer. On accepting a
force latch open token, the meter opens the load switch (load disconnected).
Note that in the energy limiting mode of operation (refer to section 11), personalisable options exist to
be able to enable or disable the incrementing of the DAE once the latch has been forced open.
7.4
Commissioning and Decommissioning the Meter
When decommissioned, the meter ceases to increment the DAE. On entering a meter-specific
commissioning token, DAE incrementing commences at the defined rate.
The meter‟s commissioned / decommissioned status can be observed in the meter state register.
7.5
Power Limiting
The power-limiting feature allows utilities to set the maximum load that can be drawn by customers.
The setting can be changed when necessary via a set power limit token from the prepayment vending
system. It is implemented as follows:
If the preset power limit threshold is exceeded, the load switch will open for a period (factory set
period of between 30s and 180s), after which it will re-close (either automatically or manually -
refer to section 7.7).
If the power limit threshold continues to be exceeded, the above process is repeated. If, after 4
power-limit events within a 15-minute window, the limit is still being exceeded because of
excessive energy consumption, the load switch will be opened for a period of 30 minutes (the
power limit lockout period).
At the end of the lockout period, the load switch will re-close (either automatically or manually
by pressing any key on the keypad - refer to section 7.7) and, unless the excessive loading has
been removed, the process will be repeated. Note that tokens may be entered and the
information modes accessed as normal during the power limit lockout period.
When in the power limit lockout mode, it is possible to view the remaining lockout time via
information register 066 - refer to section 13.34.
If the power drawn by the customer is reduced in response to a power limit disconnect, the
event will be ignored after 15 minutes has elapsed.
Power limiting is not a form of safety overload protection. It is designed to
generally limit the overall usage of power in a particular area (possibly dictated by
reticulation limitations or linked to a tariff allocation).
Display during 30-second
power limit periods
Display during 30-minute
power limit lockout period