Eaton EFX48 e-Fuse Series, Installation And Operation Manual

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EFX48-xx Series with RM3-340/440 Installation and Operation Guide
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Copyright © 2019 Eaton Corporation. All Rights Reserved.
IPN March 2019
EFX48 Main Features
This section contains detailed descriptions of the main features of the EFX48. Many of these
features have configurable parameters associated with them that can be used to customize the
behaviour of the system. There are a number of ways of changing the configuration, either via
the MMI, the Web pages or by SNMP commands. These are covered in detail on page 82.
Load Control
General description
Up to 6 loads can be connected, each of which has a configurable rating setting of between 5A
and 25A.
Note that load connections should not be connected in parallel.
The total rated load current for the unit is 50A and this can be shared amongst the 6 outputs as
required by the application.
It is the responsibility of the system designer to ensure that the correct rating is set for each
connected load by consulting the breaker curve specification. The rating should be set so that
the load output will not trip under all normal operating conditions but will offer protection to
the load under fault conditions.
Each load has an on/off switch with LED indicator. The LED is ON when the load is ON, the
led also has 2 flashing states. The LED will flash slowly (1Hz) when an output is commanded
ON but held off due to various operating conditions – this is referred to as the ‘pending’ state.
The LED will flash rapidly (4Hz) when the output has tripped due to an over current or short
circuit condition.
There are two types of output trips :
Firstly the output may trip due to the breaker curve function, these are generally longer
term over current conditions and are referred to as ‘Breaker Trips’. The time taken to trip the
output is related to the magnitude of over current and the current rating of the output set in
the configuration file. The time taken to trip under any overload condition can be
determined from the breaker curve.
Secondly the output may trip due to a very sudden and high value of current overload such
as that presented by a short circuit, these are ‘Fast Trips’. The fast trip operates at a fixed
current and is not configurable. See the Specification section on page 138 for more details.
System overcurrent function
If the input current for the EFX48 exceeds 55A for more than 20s then the Overcurrent alarm
will be activated (if enabled in the configuration) and a process of shedding loads will begin.
The input current is defined as :
Total load output c Total string current
where string charge current is positive and string discharge current is negative.
The following parameters can be set :
•
Over-current Auto retry enable or disable
•
Over-current Retry interval 60-900s
•
Over-current Retries 1-9