mpec SA380-IT, Руководство пользователя

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The SA380-IT has the ability to monitor and continuously report the following parameters:
For each monitored circuit:
System voltage.
For DC circuits, resistance to earth of individual circuit legs, R and R
B N.
For AC circuits, equivalent resistance to earth (R is measured. This is R and R in parallel.
L) B N
Resistance to earth alert status (resistance below pre-set threshold).
For each SA380-IT device:
Loop resistance between functional earth and loop earth terminals.
Earth Loop fault status.
Hardware fault status.
2.2) Principles of Operation
Monitored circuits remain galvanically isolated from one another at all times. Monitored circuits are only connected to measurement circuitry
and earth during measurement.
Periodic monitoring of the hardware and earth connection assures safe and reliable operation.
Inside the SA380-IT there is only one single instance of "measurement circuitry", however there are five instances of the "monitored circuit"
circuitry (switches and protection resistors).
Simplified voltage and resistance to earth measurement circuitry for one monitored circuit.
U = Monitored circuit voltage.
s
B = B leg circuit connection.
IT DC system up to 160 V RMS.
Equivalent resistance to earth measurement of AC circuits.
Resistance to earth measurement of each circuit leg of DC circuits.
Automatic adaptation to system leakage capacitance.
Sub 1 second rapid response time.
Adjustable response values.
Captures long-term average, as well as fast transient faults to earth
Detection of core-to-core cables faults.
Monitored circuits supply voltage measurement.
Earth-loop continuity measurement.
Continual self-test for accuracy and safety.
Volt-free contact alarm output.
Auxiliary power supply output.
In-built GSM communication.
In-built Ethernet communication.
In-built RS485 communication.
Compatible with leading enterprise asset management systems.