Hitachi Energy 520AID01 Analogue Input Module

Applications

The 520AID01 module records up to 6 analogue measured values.

The module 520AID01 can process the following types of signals

Signals:

- Analogue measured values (AMI)

- Floating-point measurement information (MFI)

The following measurement ranges can be configured

520AID01 R0001:

- ± 2.5 mA

- ± 5 mA

- ± 10 mA

- ± 20 mA

The following measurement ranges can be configured as

520aid01 r0002:

- ± 1 V DC

- ± 10 V DC voltage

Additional valid ranges and real-time zero signals can be generated beyond these ranges by means of conversions in the communication unit (CMU).

The module is available in two versions (rubrics):

- R0001: Current measurement version

- R0002: Voltage measurement version

Characteristics

Analogue inputs

Basic signal checking and cycle processing functions can be done locally to reduce the burden on the communication unit.

The module transmits the relevant changes as events via the RTU I/O bus.

The 6 differential inputs are not galvanically isolated from the power supply.

The single-ended or differential inputs have a resolution of up to 2048 levels (11 bits plus sign) and measure amplitudes of 100 per cent.

The differential inputs are protected against static and dynamic overvoltage by means of a protection circuit. A low-pass filter suppresses unwanted frequency components.

The internal high resolution of the AD converter allows all measurement ranges to be scanned with the same resolution.

An additional 2 measurement channels are used for automatic zero calibration. This compensates for long-term component drift.

In order to eliminate tolerances, calibration is carried out during production.

Measurement ranges and line frequencies can be easily configured with the RTUtil500 configuration tool.

The synchronisation of the scan period with the line frequency enhances the line frequency interference suppression of DC input signals.

Power input

The required power supply for the module is provided via the RTU520 I/O bus connector.

I/O Controller (IOC)

The microcontroller on the module handles all key tasks for the parametric processing functions.

In addition, it communicates interactively with the RTU I/O bus.

All configuration data and processing parameters are loaded by the communication unit via the RTU I/O bus.

The module can be connected to the RTU520 I/O bus by connecting an I/O adapter (e.g. 520ADD01) or the RTU520 communication unit.

The analogue input unit performs the following processing functions on the measured values:

- Scan period and line frequency interference suppression

- Zero value monitoring and switch detection

- Smoothing

- Absolute or cumulative threshold monitoring

- Periodic transmission and background cycling

During initialisation and operation, the module performs a series of tests. If a fault occurs, it will be reported to the communication unit.

All fault conditions affecting the module's functionality are indicated as common fault signals by means of red LEDs.