Ampcontrol Pty Ltd
– ABN 28 000 915 542
OCS USER MANUAL
MAG-182 Version 5
– FEB/2020
Uncontrolled Copy - Refer to Ampcontrol Website for Latest Version
Page 18 of 72
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4.5 External Accessories
4.5.1 Earth Leakage CT
The Outlet Cassette Protection Element uses an Ampcontrol EL500 series current transformer for earth
leakage measurements. For the purposes of outlet identification tests during operation, the earth
leakage toroid is installed separately to the Cassette.
4.5.2 Remote Termination Unit (RTX)
The RTX is a microprocessor based module that can be utilised to replace the diode at the end of the
trailing cable pilot conductor. It is powered by and communicates via the pilot line. Its non-volatile
memory stores the parameters to configure the outlet as appropriate for the connected machine. The
RTX Module is pictured in Figure 4.4.
All terminals are fully shrouded, with the pilot and earth terminals being segregated from the other
terminals.
The RTX provides remote start and stop facilities. The circuitry involved in these functions is self-
diagnostic and will cause the outlet to turn off if the circuits are earthed or interconnected. This reduces
the chance of the outlet operating when not required to do so due to wiring faults. It should be noted
that these functions are operational only, and that any emergency stops should be wired directly into
the pilot circuit.
PTC terminals are provided for a semiconductor ‘switching’ thermistor. These terminals are protected in
a similar manner to the stop and start circuits. If the remote start, stop and PTC functions are not
required, each set of terminals must be bridged in order to start the Protection Element.
Five RTD inputs are provided for PT100 RTDs. These terminals can also be used with resistor
networks to provide digital information back to the Cassette Protection Element.
A parameter dongle allows an RTX to be replaced without needing to re-program the parameters.
When installed, this dongle should be firmly secured to the machine/equipment.
Figure 4.4: Remote Termination Unit (RTX)
4.5.3 Parameter Dongle
Parameters important to the running of the Protection Element and the safe operation of the outlet onto
which it is connected are stored in the Protection Element Parameter Dongle. The Parameter Dongle is
exchangeable between Protection Elements, but it is intended to be physically tethered to the outlet
that it controls.
Although the Protection Element and the RTX use the same hardware parameter dongle the
parameters they store are different. As such the parameter dongle is not interchangeable between the
Protection Element and RTX.
