Reference Manual
Power Analyzer EMM5
Rev. 11
2018-07
7
integrated data logger (option –DM) are also counter for a second tariff available. The switchover can be done via the
built-in clock or the digital input.
Active power values are signed values! The signs have to be interpreted as follows: A positive sign shows power
flow in one direction, a negative sign in the other. So, positive active power can be interpreted as
active power import, the negative active power as active power export.
1
Reactive power values are
signed values, too! The signs are automatically interpreted as inductive or capacitive. The user of the
EMM5 will always see a "ind" or "cap" mark with reactive values, so he never needs to worry about
interpretation of signs with any reactive value.
3
Alarm system
The unique alarm-system of the EMM5 was designed to provide maximum flexibility. It consists of 32 user-configurable
alarms. Each of them continuously compares one of the measured values to an assigned limit and, if necessary, triggers
the alarm. Each of the alarms provides the following features:
Alarm source can be any measured value, with exclusion of work counters and single harmonics
Configurable limit value for each alarm
Trigger condition selectable (value>limit or value<limit)
Alarm-specific turn-on-delay
2
Alarm-specific turn-off-delay
3
Alarm storage in the event recorder (optional)
An alarm-specific set of output relays and the possibility to display an alarm message
1
The precise definition is: If the current, measured on terminal K with respect to terminal L, is in phase with
the corresponding voltage, the active power will be positive and defined as “energy import”.
2
This provides a delay between the recognition of the alarm state and the activation of the alarm outputs
(relays and display message).
3
The function is similar to the turn-on-delay but it is used for insertion of a delay time between the alarm
condition becoming false and the signal to all target relays to reset being sent.
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