Ampcontrol Pty Ltd
– ABN 28 000 915 542
PF1 USER MANUAL
MAG-165 Version 6
– March/2020
Uncontrolled Copy - Refer to Ampcontrol Website for Latest Version
Page 40 of 71
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9
EARTH CONTINUITY: AS/NZS 2081 PROTECTION FUNCTION
The PF1 has a selectable earth continuity (EC) protection function, which has been designed in
accordance with AS/NZS 2081: 2011. This protection function checks the integrity of the earth
connection between an outlet and a load via the pilot conductor in the cable.
In a typical installation the PF1 r
elay’s EC Pilot terminal (20) will be connected to the pilot conductor of a
trailing or reeling cable. The load end of the pilot conductor is terminated with a diode to earth, creating a
return path through the earth conductors of the cable to the main earth point of the outlet and then to the
PF1 r
elay’s EC Earth terminal (21).
CAUTION!
The 1N5404 type diode must be used in the pilot termination for
AS/NZS 2081 compliant operation.
The PF1 measures the resistance of the pilot-earth loop (series resistance) and the resistance between
the pilot and earth (shunt / insulation resistance). If the pilot-earth loop resistance rises above the set trip
level for a period of time that exceeds the set trip time, an earth continuity trip will occur. If the pilot to
earth resistance falls below the shunt resistance trip level of 1.25
kΩ, for longer than the set trip time, an
earth continuity trip will occur.
In the event of an earth continuity trip, the PF1 will de-energise
the K1 output relay, tripping the outlet’s
main contactor.
An earth continuity trip can be configured as latching or non-latching. This allows the user to choose if
the trip is manually or automatically reset once the pilot-earth loop is healthy.
NOTE
Cable parameters are important to the correct operation of the Pilot EC
function. Resistance & capacitance values limit the length of cable that
the relay can drive (refer to Section 13).
The PF1 r
elay’s earth continuity protection settings can be configured using the Smart Tools software.
Adjustable settings are: Enabled, Trip Latching, Remote Start, Trip Resistance: Series (Maximum), and
Trip Time.
