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Hitachi Sj7002 Owners Manual

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Page 281

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...

Page 282

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)...

Page 283

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...

Page 284

Serial 
Communications
In This Appendix....page
— Introduction.......................................................................................   2
— ASCII Mode Communications...........................................................   5
— Communications Reference Information........................................   18
— ModBus Mode Communications.....................................................   21
— ModBus Data Listing..........................................................................

Page 285

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...

Page 286

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...

Page 287

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....

Page 288

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...

Page 289

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...

Page 290

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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