mpec SA380-IT, User Manual

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Clean Wipe the SA380-IT with dry cloth to remove dust and loose
particles.
Inspect Ensure all wiring is in good order and free of degradation.
Ensure the the SA380-IT enclosure is in sound condition.
Inspect Ensure the SA380-IT does not have the indication lit. HW FAULT
In the event of an illuminated light, please consult section 5.2 HW FAULT
5.2) Faulting Device Interlocks
Section 2.7 describes how the SA380-IT is continuously checking that all internal circuitry is functioning within established operating
parameters.
Whilst device interlocks are designed to only operate under genuine fault conditions, scenarios exist that cause them to falsely trigger. In
such scenarios it is desirable to manually clear device interlocks in order to recommence measurement.
There are four ways to clear device interlocks:
Power cycle the SA380-IT on-site.
Reboot the SA380-IT using the web-based tool.
Clear device interlocks using the web-based tool.
For self-clearing interlocks - remove the fault.
Clearing down a device interlock is unlikely to put the SA380-IT into a dangerous state, as the same self-checks that enabled the interlock
will re-enable the same interlock if the fault persists. Self-clearing device interlocks will automatically clear as soon as the fault is removed.
The table below shows all device interlocks, potential causes and remedies.
Genuine Hardware Fault Potential False-Trigger Self Clearing? Fault Finding Actions
Monitored Circuit
Under-Voltage Resistive cable open circuit.
Internal measurement
circuit fault.
Circuit configured to
perform measurement,
however no circuit is
physically attached.
Circuit configured to
perform DC measurement,
however circuit is wired with
the incorrect polarity.
Circuit configured to expect
a DC voltage, however an
AC voltage is present.
Monitored circuit is
temporarily not energised.
Yes Check monitored circuit
wiring integrity
Replace resistive cable.
Disable unused circuits
using the web-based tool.
Ensure the correct voltage
type (AC/DC) is configured
for the monitored circuit.
Check monitored circuit for
voltage.
Negative Earth Loop
Resistance Internal measurement
circuit fault. Transient event on the earth
loop. Yes Check earth loop wiring inte
grity.
High Earth Loop
Resistance Earth loop wiring has
become disconnected.
Internal measurement
circuit Fault.
The installations earth loop
impedance is genuinely out
of tolerance.
Transient event on the earth
loop. Yes Check earth loop wiring
integrity.
Check earth continuity of
the electrical installation.
In the event of enclosure damage, the SA380-IT is to be removed from service. immediately
Always investigate the cause of a device interlock before manually clearing it down.