Ampcontrol Pty Ltd
– ABN 28 000 915 542
EFL PROTECTION RELAY USER MANUAL
MAG-178 Version 5
– MARCH/2020
Uncontrolled Copy - Refer to Ampcontrol Website for Latest Version
Page 19 of 23
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6.4 Undervoltage (UV) Protection Function
In addition to the EFLO and FC protection functions provided by the EFL Relay, a selectable
Undervoltage Protection Function is available. This function will monitor the voltage on the outlet via the
HV Barrier and initiate an UV trip if the measured voltage falls below 50% of the selected system
voltage.
The UV Protection Function can be activated and deactivated via the Voltage Selector Switch on the
fascia of the EFL Relay.
If a UV trip occurs, this trip will be latched in the memory of the EFL Relay. In order to clear a UV trip, the
External Reset terminals must be shorted together. This is typically achieved through the use of an
externally wired normally open push button.
NOTE
To
reset a UV trip
, the External Reset terminals of the EFL Relay must
be shorted together using an externally wired pushbutton or relay. A UV
trip cannot be cleared whilst the EFL Relay is de-energised.
6.5 User Interface
Figure 6.2: EFL Relay User Interface: Functionality of Operators
Rotate the Voltage Selector to select
the system voltage of the outlet.
The Undervoltage Protection Function
is also activated with this selector. To
turn UV Protection on, select a
system voltage within the white
portion of the circle. To turn off UV
protection, select a system voltage
from the red side of the circle.
VOLTAGE SELECTOR
FUNCTIONALITY
Rotate the Time Selector to select the
time setting for the ‘Back EMF timer’.
This setting will determine the length
of time that the EFL Relay will wait for
Back EMF voltages to subside after
the contactor has opened, before
applying the trip conditions to the
measurements.
TIME SELECTOR FUNCTIONALITY
All FC Trips must be reset by
pressing the RST pushbutton.
Provided that the EFL Relay’s super
capacitor is charged, an FC Trip reset
can be performed when power is not
applied to the relay.
RST PUSHBUTTON
FUNCTIONALITY
