33
3.8
Storage of measurements
3.8.1
Internal memory
All data that needs to be retained during a power failure, is stored in inter-
nal memory (Flash technology, non volatile without backup battery, size of
internal memory : 1MByte). These are all device parameters, registration
period data (load profile data), spontaneous events and resets (billing
data).
Each type of data uses a separate area of memory, which is administered
separately. Memory is organized as a circular buffer, i.e. once a particular
storage area is full, the “oldest” information will be overwritten.
The registration period memory area can alternatively contain demand val-
ues, energy increments or cumulative counter values, positive and negative
totals, apparent energy and cos(
ϕ
).
3.8.1.1 Unit restart (Loading of factory default settings)
After a unit restart (message in the display (“Parameter Reset”) the com-
plete internal memory (device parameters, spontaneous events, resets and
registration period data) is erased and the standard parameters will be
loaded (see menu item “Factory settings”, page 95). A unit restart can be
executed in the following ways:
•
Via the keypad: menu item „SET PARAMETERS – Factory settings”. This
is password protected.
•
Via the programming software DLXPARA (using the service interface. This
is password protected.
•
Via hardware reset: switch off the unit and place a jumper onto the pins la-
belled “Test” (located on the CPU board under the display), then power up
the unit and wait until the display shows “Parameter Reset”, then remove
the jumper. This is protected by seals.
If parameters defining the buffer usage (number of counters, totals,
digits, measurement types or storage allocation) are altered, the regis-
tration period buffer and the reset memory are erased automatically.
3.8.1.2 Unit warm start
The DLX unit performs a warm start (message in the display: “System
warm start”) under the following conditions:
•
On return of power supply after a power failure
•
When placing the “Reset” jumper on the CPU board.
Data device parameters and data remain intact. No data will be stored for
registration periods during which the power supply was absent. An event
will be stored in the spontaneous event buffer for a unit warm start.
Summary of Contents for DLX
Page 9: ...9 1 Scope of Application 1 1 Application environment Figure 1 Application environment...
Page 42: ...42 4 2 Installation diagram Figure 13 Dimensions of mounting points...
Page 54: ...54 7 Menus 7 1 Flow diagram Figure 24 Flow diagram of menus...
Page 110: ...Subject to change without notice...
Page 111: ...E116012215052 Appendix A Data Retrieval Protocols...
Page 112: ...A 2...
Page 156: ...Subject to change without notice...
Page 157: ...E116012215052 Appendix B Table Addresses...
Page 158: ...B 2...
Page 170: ...Subject to change without notice...
Page 171: ...E116012215052 Appendix C List of Parameters and Constants...
Page 172: ...C 2...
Page 178: ...Subject to change without notice...
