AEG 8000012364 BAL operating instructions Principle of Operation of the INV, Electrical

Page 14

"UniVert 2" inverter

Figure 2 illustrates the principle of an INV.

In normal operation, the load is supplied "Online" by the INV. With systems comprising several parallel INVs, the load current is divided in accordance with the number of INVs. Depending on the system design, a power supply using up to 8 INVs can be realised. In addition to the parallel operation of several INVs, the reliability of supply can be further increased by integrating a static bypass switch, SBS. In the event of a failure of several INVs, switchover to the mains takes place without any interruption. Apart from power cabling, a bus line is required for control purposes between the units for systems comprising several INVs (and SBSs). The bus line has to be terminated at both ends with a resistor.

ATTENTION:

This INV must not be connected in parallel to the mains on the output side!

2.4Principle of Operation of the INV, Electrical

After connection of the DC voltage, the DC filter capacitors are charged via the softstart device. The control unit activates a bridging contactor as soon as the capacitor charging process is finished. The DOU displays measured values (output voltage/output current) on the LCD and the unit status via LEDs. The INV is switched on using the ON/OFF switch on the DOU. When the INV has been switched on, it can be started or stopped by connecting or disconnecting the

DC voltage supply.

The transistor INV set, pulsed with approx. 20 kHz, transforms the direct voltage into a single-phase sinusoidal AC voltage. The voltage is transformed electrically isolated to the required AC output voltage using a transformer. The secondary voltage is led to the load terminals via the AC filter, a miniature circuit-breaker, a current transformer and the INV output contactor. The stabilised output voltage of the INV is short-circuit-proof and can supply loads from capacitive through ohmic to inductive, as well a non-linear loads with a high crest factor. The INV also supplies high starting currents for motor loads. Refer to chapter "Technical data" for the exact specifications. The entire control and monitoring process is carried out using a microprocessor. LEDs and relays show the unit status, whilst output voltage and output current are displayed on an LCD. INVs for parallel operation need a choke between the INV output and the busbar. When several INVs are operated in parallel, or one or more INVs are operated with an SBS, a CAN bus is required between the units for control purposes. An additional CAN bus allows the unit to be integrated in a power supply system and connected to a central control and monitoring unit (PSM).

With individual units, the INV immediately starts after actuating the ON/OFF switch. With an INV with SBS and presence of the mains, the INV starts immediately, but the output contactor is only switched on after synchronisation with the mains. With systems comprising several INVs, these synchronise to the mains and then jointly switch on the output contactor. The INV can be switched off in every operating status without delay using the ON/OFF switch.

Page 14 of 42

8000012364 BAL, en

Page 13 Page 15
Image 14
Page 13 Page 15
Contents Operating Instructions UniVert 2 inverter and SBS option Validity WarrantyDuty to Provide Information HandlingCopyright AbbreviationsHotline Table of Contents Dimensional Drawing Maintenance TroubleshootingTechnical Data Accident Prevention Regulations Safety InstructionsImportant Instructions and Explanations Qualified Personnel Safety Awareness ApplicationLiability DirectivesGeneral Information System DescriptionParallel INV operation Function of the SystemIndividual INV operation Individual or parallel operation with SBSParallel INV operation Block diagram of the inverter Description of the INVPrinciple of Operation of the INV, Electrical Description of the SBS SBSPrinciple of Operation of the SBS, Electrical Function of the Inverter Can Bus Interfaces X6 ON/OFF SwitchDIL Switch S2.1 S2.2 S2.3INVs Settings must be the same on all INVs and the SBS Switches S2.4, S2.5 and S2.6 Own Address INVSwitches S2.7 and S2.8 Number of redundant INVs S2.4 S2.5 S2.6 AddressSignalling, Displays and Remote Signals Display Colour Operating statusOperating Statuses Switchback AttemptsFunction of the SBS optional AC Busbar Reset ButtonAC Mains Input AC Mains Monitoring SystemS3.1 S3.2 S3.3 S3.7 S3.8 INVs Operating modes Assignment of the signal terminalsSwitchover without gap Switchover with gap Start-Up InstallationConnecting the Loads / DC / Mains ConnectionDisconnection Maintenance For systems with SBS additionally TroubleshootingOutput Voltage Deviation Technical Data General Data INVCollective fault FaultOvertemperature ϑ OperationGeneral Data SBS With safe isolation at UO ≤ 60 V DC UniVert 2 inverter Electrical Data At 24 Type E-number G110 E230/10,9/2rfg-CFp2,5 3000000263 Type E-number E230 E230/115/2-VFp26,5-8 3000000646 Dimensional Drawing Inverter dimensions type 1.5 and 3.3 kVAInverter dimensions type 2.5 kVA SBS dimensions
Top Page Image Contents