Device handbook Aplus-led Operating Instructions Aplus with LED display or without display 157 679-19 (PM 1000357 000 01) 04/2016

Legal information Warning notices In this document warning notices are used, which you have to observe to ensure personal safety and to prevent damage to property. Depending on the degree of danger the following symbols are used: If the warning notice is not followed death or severe personal injury will result. If the warning notice is not followed damage to property or severe personal injury may result. If the warning notice is not followed the device may be damaged or may not fulfill the expected functionality. Qualified personnel The product described in this document may be handled by personnel...

Device handbook Aplus with / without LED display, 157 679-19, 04/2016

Device handbook APLUS with / without LED display, 157 679-19, 04/2016

1.1 Purpose of this document This document describes the universal measurement device for heavy-current quantities Aplus. It is intended to be used by: • Installation personnel and commissioning engineers • Service and maintenance personnel • Planners Scope This handbook is valid for all hardware versions of the Aplus with LED display or without display. Some of the functions described in this document are available only, if the necessary optional components are included in the device. Required knowledge A general knowledge in the field of electrical engineering is required. For assembly and...

2. Security notes Device may only be disposed in a professional manner ! The installation and commissioning should only be carried out by trained personnel. Check the following points before commissioning: – that the maximum values for all the connections are not exceeded, see "Technical data" section, – that the connection wires are not damaged, and that they are not live during wiring, – that the power flow direction and the phase rotation are correct. The instrument must be taken out of service if safe operation is no longer possible (e.g. visible damage). In this case, all the connections...

3.2 Possible modes of operation The APLUS can cover a wide range of possible input ranges without any hardware variance. The adaption to the input signal is performed by means of variable amplifying levels for current and voltage inputs. Depending on the application it makes sense to fix these levels by means of the configuration or to let them stay variable to achieve a maximum accuracy during measurement. The differentiation, if the amplifying remains constant or is adapted to the present value, is done during the definition of the input configuration by means of the parameter "auto-scaling"....

3.3 Monitoring and alarming The logic module integrated in the APLUS is a powerful feature to monitor critical situations without delay on device side. By implementing this local intelligence a safe monitoring can be realized which is independent of the readiness of the control system. 3.3.1 Alarming concept How alarms are handled is decided during the configuration of the device. For that in the logic module you can define if LED's are used for alarm state display and how resp. when a possibly activated action, such as the switching of a relay, will be reset. These configuration parameters are...

Z: Logic output determined from all involved logic inputs D: Corresponds to signal Z, delayed by the switch-in resp. dropout delay A: Output signal of the logic function S: State of the subsequent operation (e.g. of a relay), corresponds normally to A, but may be inverted (subsequent operation: relay OFF) 1) Alarm reset inactive, switch-in and dropout delay 3s, follow-up action not inverted \ z delayed alarm logic output follow-up action Reset when alarm is inactive Acknowledgment of LED, inactive alarm Acknowledgment of LED, active alarm follow-up action Reset when alarm is still active Device...

3.3.2 Logic components The logic outputs are calculated via a two level logical combination of states, which are present at the inputs. Usable components are AND, OR and XOR gates as well as their inversions NAND, NOR and XNOR. A farming via relay, digital outputs, alarm LED Entries into alarm or event list states of digital inputs Results of logic functions Triggering of disturbance recorder Simulation Alarm reset via display, bus, digital input The principal function of the logical gates is given in the following table, for simplicity shown for gates with two inputs only. older symbols truth...

3.3.3 Limit values States of limit values are the most important input quantities of the logic module. Depending on the application, limits either monitor the exceeding of a given value (upper limit) or the fall below a given value (lower limit). Limits are defined by means of two parameters, the limit for the ON and the limit for the OFF state. The hysteresis is the difference between these two values. Upper limit: The limit for ON state (L.On) is higher than the limit for the OFF state (L.OFF) Limit for ON state ► The state 1 (true) results if the limit for ON state is exceeded. It remains...

The evaluation of the logic module is performed from top to bottom and from left to right: 1. Y1, Y2, Y3, Y4 2. Z1, Z2, Z3, Z4 3. D1, D2, D3, D4 4. A1, A2, A3, A4 ► The evaluation is performed once each cycle of the power frequency, e.g. every 20ms at 50Hz. But the time between two evaluations will never be longer than 25ms. ► If the logical states Y1...Y4, Z1...Z4, D1...D4 and A1...A4 are used as inputs, their changed states will be included in the evaluation of the next interval ► Exception: In the first evaluation level the state of previous logical functions may be used as input without delay,...

3.4 Free Modbus image Accessing measured data of a Modbus device often needs some special effort, if the interesting measurements are stored in different, non continuous register areas. This way multiple telegrams must be sent to the device to read all data. This needs time and it's very likely, that the measurements don't originate from the same measurement cycle. A free assembly of the data to read helps a lot. The APLUS supports, along with the still available classical Modbus image with thousands of registers, the facility to assemble two different images, which may be read with one telegram...