Filename: User Guide Sabre Mk5 Rev 0.0.doc
Page 16 of 28
5.5.1.10. Commissioning Voucher (Meter-Specific, Proprietary Voucher)
This is a
meter-specific
voucher but in all other aspects its operation is the same as
described in paragraph 5.5.1.9.
Note: An already commissioned meter rejects a commissioning token.
5.5.1.11. Decommissioning Voucher (Meter-Specific, Proprietary Voucher)
On accepting a
decommissioning
voucher, the meter opens the load switch (load
disconnected) and disables the
tamper
detect sensing switch function.
Note: An already decommissioned meter rejects a commissioning token.
5.5.1.12. Set Options Register (Meter-Specific, Proprietary Voucher)
On accepting this voucher, the “Changeable Options Register 0” is set according to
the 8-bit value in the token. Care must be taken when using this feature, as the
operator would not know the settings in the meter, and various parameters could
be set/reset. The parameters are as follows:
Enable/Disable Tamper Function
Tamper / Do Not Tamper on Significant Reverse Energy
Disconnect / Do Not Disconnect on Power-Fail
Non Automatic / Automatic Latch Reconnect
Refer to paragraph 6.14 for more detail.
5.6. Commissioning and Decommissioning the Meter
The function of being able to set the meter into the decommissioned / commissioned mode
offers several advantages to meter installation personnel. If power is applied to the meter
during installation and the meter terminal cover not yet in place, the meter will detect this and
enter into the tampered mode, thereby disconnecting the supply to the customer. A meter-
specific tamper reset voucher then needs to be generated at the vending system to rectify
the situation.
When setting the meter into the decommissioned mode, the following occurs:
•
The
tamper
detect sensing switch function is disabled.
•
The
load switch
is set into the open state.
•
When setting the meter into the
commissioned mode
, the following occurs:
•
The
tamper
detect sensing switch function may be either enabled or disabled.
•
The
load switch
operates as normal.
•
The
meter’s
commissioned
/
decommissioned
status can be observed in the
meter
state register
- refer to paragraph 6.11.
5.7. 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 voucher from
the prepayment vending system.
Eskom specification DISCAAA9 makes specific reference to a power-limiting algorithm. This
algorithm is included in the meter’s software and is implemented as follows:
•
If the preset
power limit
threshold is exceeded, the
load switch
will open for a period
of 30 seconds (
power limit trip period
), after which it will re-close (either automatically
or manually - refer to paragraph 5.8). 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
