Cewe Prometer 100 User Manual

BGX501-943-R01 Prometer 100 User Manual Page 45 of 72
For several of the flags, additional information can be viewed in the event log. A more exact time for events
is specified in the log.
Note: When power is calculated from logged energy values, the resulting values will be somewhat more precise
than when power is logged directly. This is because power is logged as an average value of instant values. The
instant values are read twice per second, while energy is accumulated continuously.
7.8 Alarms
The Prometer 100 is equipped with alarms to be able to indicate when measured quantities are over or under a
factory configured limit value. The meter enters the alarm state when the limit value is reached. An alarm is
generated only after the alarm state has continued for a configurable time (persistence time). Alarms are
configurable by the user and are therefore called user-defined alarms. The persistence time can be configured
to a maximum of 60 minutes.
Note: There are alarms and events that cannot be configured, but instead, are always active. Examples of such
alarms are indication that the clock has been changed or that an auxiliary power loss has occurred. For more
information, see the section Display of events (pg. 46).
7.8.1 Overview
For most user-defined alarms, the limit value is specified as a percentage of the nominal value, which is the
configured, nominal primary value (current, voltage or power). For 3-element meters, the limit value corresponds
to phase voltage, and for 2-element meters, phase to phase voltage. The following table provides an overview
of available alarms.
Alarm
Description
Low voltage
Alarm can be configured for low voltage event. Occurred condition is treated as
alarm condition.
High voltage
Alarm can be configured for high voltage event. Occurred condition is treated as
alarm condition.
Voltage unbalance
Alarm can be configured for voltage unbalance event. Occurred condition is
treated as alarm condition.
Current unbalance
Alarm can be configured for current unbalance event. Occurred condition is
treated as alarm condition.
High THD voltage
Alarm can be configured for voltage THD event. Occurred condition is treated as
alarm condition.
High THD current
Alarm can be configured for current THD event. Occurred condition is treated as
alarm condition.
High THD power Average value of THD for all power phases exceeds the limit value.
Any phase voltage
missing
Alarm can be configured for PT miss event (any phase). Occurred condition (any
phase) is treated as alarm condition.
Frequency healthy Frequency is (< 49 Hz or >= 51 Hz) or (<59 Hz or >= 61 Hz)
Auxiliary power
supply fail
Any auxiliary supply fails
Low power factor
System power factor is below limit value.
Low active power System active power is below limit value.
High active power System active power is above limit value.
Single harmonic
high voltage
Any phase voltage individual harmonics value (2
nd
to 31
st
) is above limit value.
Every 5 second meter will scan 2
nd
to 31
st
harmonic values for one phase and in
next 5 sec meter will scan for next phase. Hence resolution of checking for each
phase is 15 second.

Cewe Prometer 100 Specifications

General

Brand	Cewe
Model	Prometer 100
Category	Measuring Instruments
Language	English