Glossary - Baer DLX User Manual

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Glossary

Active demand
That part of the demand used to perform work at the load (see also reactive
demand).
Alarm
Unusual event during operation of the device (e.g. power failure, register
overflow etc.).
Alarm class
Differentiation of alarms by importance. The DLX knows the alarm classes
"warning" for non critical or operational disturbances and "device fault" for
grave errors.
Alarm group
Division of alarms into functional groups, e.g. the alarm group "energy reg-
ister overflow" has alarms for each individual register.
Apparent demand
Is the hypotenuse of the right angled triangle constructed from active de-
mand and reactive demand. The calculation of apparent demand in the
data logger requires the definition of at least one input each for active de-
mand and reactive demand.
Billing period / Billing list
Period of time covered by an invoice from the energy supplier. Usually one
month, corresponds to one reset.
Cold start
When the unit performs a cold start, parameters and register contents are
retained. However, the device time will be set to time of the last stored reg-
istration period plus 59 minutes and 10 seconds (see also "unit restart" and
"warm start").
Configuration
Definition of basic properties of the data logger (e.g. number of inputs, total-
ling units, etc.). Configuration is done by the manufacturer and cannot be
modified by the user. Configuration data is stored in a non volatile memory
such as EEPROM or FLASH EPROM.
Cos( ϕ ϕ ϕ ϕ )
The cosine of the arc between the apparent demand pointer and the active
demand pointer. A cos( ϕ ) of 1.0 indicates flow of active energy only, a
value of 0.0 indicates flow of reactive energy only.
Counter input
Receives energy and demand values from a meter in numerical form (e.g.
via a serial interface of type RS485).
DCF77
Long wave transmitter for the official time of Germany.
Carrier frequency: 77,5 kHz.
Demand register
Contains the average demand values per registration period in physical
units (e.g. MW, kvar, etc.).
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