Hitachi Sj7002 Owners Manual
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Glossary Appendix A A–4 Isolation TransformerA transformer with 1:1 voltage ratio that provides electrical isolation between its primary and secondary windings. These are typically used on the power input side of the device to be protected. An isolation transformer can prot ect equipment from a ground fault or other malfunction of nearby equipment, as well as at tenuate harmful harmonics and transients on the input power. Jogging OperationUsually done manually, a jog command from an operator’s pa...
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SJ7002 Inverter Appendix A A–5 ReactanceThe impedance of inductors and capacitors has two components. The resistive part is constant, while the reactive part change s with applied frequency. These devices have a complex imped- ance (complex number), where the resistance is the real part and the reactance is the imaginary part. RectifierAn electronic device made of one or more diodes that conver ts AC power into DC power. Rectifiers are usually used in combination with capacitors to filter (smooth)...
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Bibliography Appendix A A–6 Thermal SwitchAn electromechanical safety device that opens to stop current flow when the temperature at the device reaches a specific temperature threshold. Thermal switches are sometimes installed in the motor in order to protect the windings fro m heat damage. The inverter can use thermal switch signals to trip (shut down ) if the motor overheats. See also trip. ThermistorA type of temperature sensor that changes its resistance according to its temperature. The...
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Serial Communications In This Appendix....page — Introduction....................................................................................... 2 — ASCII Mode Communications........................................................... 5 — Communications Reference Information........................................ 18 — ModBus Mode Communications..................................................... 21 — ModBus Data Listing..........................................................................
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Introduction Appendix B B–2 Introduction SJ7002 inverters have a built-in RS485 serial communications interface. This serial communi- cations function provides a way of controll ing from 1 to 32 inverters on a common serial network. SJ700 2, SJ300, and L300P inverters all have th e same communications prototol. In a typical application, a host computer or controller is the master and each of the inverter(s) is a slave, as shown in the figure below. The specifications for SJ700 2 Series RS485 serial...
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SJ7002 Inverter Appendix B B–3 Serial Connection DiagramsThe serial connector is to the left of the control logic connector as shown below: Each device requires just two connections in parallel for data transmission and reception. Additionally, the device at each physical end of the wiring requir es a termination resistor. The SJ700 2 has built-in termination resistors that become part of the circuit when you add a jumper as shown. The termination resistor help s to suppress electrical...
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Introduction Appendix B B–4 Serial Network Parameter SettingsSeveral parameter settings are necessary to configure serial communications, listed below. For inverters on the same network, some settings must match from inverter to inverter. These include: Baud rate, data bi ts, parity, and stop bits. However, the node address on each inverter must be unique, used only once on the network. Communication Test ModeUse the communication test mode to check the RS485 serial port hardware on the inverter....
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SJ7002 Inverter Appendix B B–5 ASCII Mode Communications Introduction to Command ListThe network master sends a frame to initiate communications with a slave, as shown in the figure to the right. After the set waiting time (per parameter C078, the inverter responds. The following table lists the commands (single-character codes) sent to a particular device on the network. Some commands may be broadcast to all devices on the network. NOTE: Use of command 08 – set inverter parameters to default...
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ASCII Mode Communications Appendix B B–6 The example below shows a transmission to the inverter at address Node 1 to rotate the motor in the forward direction. Command – 01The 01 command sets the output frequency for the standard profile. You must set parameter A002=03 in order for serial communicati ons control of the inverter to apply. The frame format of command 01 follows the timing diagram and specification table. The example below shows a transmission to the in verter at address Node 1 to set...
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SJ7002 Inverter Appendix B B–7 Commands – 02 and 12The 02 command sets the logic state (ON or OFF) of the intelligent input terminals. The frame format of command 02 follows the timing diagram and specification table. The 16-byte data string is specif ied in the following tables: ElementDescriptionSizeVa l u e STX Control code (STart of TeXt) 1 byte STX (0x02) Node Node (station) address of inverter 2 bytes 01 to 32, and FF (broadcast to all) Command Transmission command 2 bytes 02 or 12 Data...
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