Hitachi SJ-MB User Manual
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SJ-MB Modbus/RTU
Communications Option Board
Instruction Manual
• SJ300 Series
• L300P Series
NOTE: REFER ALSO TO SJ300 or L300P SERIES INSTRUCTION MANUAL
Manual Number: HAL1052
Se
tember 2007
Hitachi America, Ltd.
After reading this manual,
keep it handy for future reference.
NOTES:
Table of Contents
Table of Contents
Table of Contents................................................................................................................... 3
Chapter 1 – General Description.......................................................................................... 5
Chapter 2 – Installation and Wiring...................................................................................... 9
Chapter 3 – Configuration................................................................................................... 13
Chapter 4 – Operation......................................................................................................... 15
Chapter 5 – Troubleshooting.............................................................................................. 17
Appendix – Parameter List ................................................................................................. 18
Index..................................................................................................................................... 33
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NOTES:
Table of Contents
Page 4 of 36
Chapter 1
Chapter 1 – General Description
The SJ-MB option board is a Modbus/RTU communication interface for the Hitachi SJ300 and L300P series of
AC Variable Frequency Inverters. The board can be installed in either of the two available option slots in the
inverter.
The SJ-MB uses the open MODBUS/RTU communication protocol. It utilizes a serial RS485 physical interface
with a maximum 57600 Baud data rate. Even though the board uses the MODBUS/RTU protocol, this does not
mean that all MODBUS services and functions are supported. Detailed description of the available functionality
is provided in Chapter 4 of this manual. The board will act as a MODBUS/RTU slave that can be read from and
written to over a serial RS485 network from a MODBUS/RTU master device. It will not initiate communication
with other devices on the network. It will only respond to requests from a master device. The SJ-MB will allow
a user to control the operation of the inverter, monitor its operation, and modify parameters.
Before using this product, please read this manual and the relevant inverter manual, and be sure to follow all
safety precautions noted therein. After unpacking the SJ-MB board, carefully inspect it for any defect or
damage, and be sure all parts are present.
Carton Contents
(1) SJ-MB Modbus Communication Interface Board
(2) Screws to secure board to inverter case (M3 x 8mm)
(1) CD-ROM containing this manual (pdf)
WARRANTY
The warranty period under normal installation and handling conditions shall be eighteen (18) months
from the date of purchase, or twelve (12) months from the date of installation, whichever occurs first.
The warranty shall cover repair or replacement, at Hitachi’s sole discretion, of the SJ-MB Option board.
Service in the following cases, even within the warranty period, shall be to the customers account:
1. Malfunction or damage caused by misuse, modification or unauthorized repair.
2. Malfunction or damage caused by mishandling, dropping, etc., after delivery.
3. Malfunction or damage caused by fire, earthquake, flood, lightning, abnormal input voltage,
contamination, or other natural disasters.
If service is required for the product at your worksite, all expenses associated with field repair are the
purchaser’s responsibility. This warranty only covers service at Hitachi designated service facilities.
If making a warranty claims in reference to the above, please contact the distributor from whom you
purchased the SJ-MB, and provide the model number, purchase date, installation date, and description
of damage or missing components.
Page 5 of 36
SAFETY PRECAUTIONS
HIGH VOLTAGE: This symbol indicates high voltage. It calls your attention to items or operations
that could be dangerous to you and other persons operating this equipment. Read the message and
follow the instructions carefully.
WARNING: Indicates a potentially hazardous situation that, if not avoided, can result in serious
injury or death.
CAUTION: Indicates a potentially hazardous situation that, if not avoided, can result in minor to
moderate injury, or serious damage to the product. The situation described in the CAUTION may, if
not avoided, lead to serious results. Important safety measures are described in CAUTION (as well as
WARNING), so be sure to observe them.
HIGH VOLTAGE: Motor control equipment and electronic controllers are connected to hazardous
line voltages. When servicing drives and electronic controllers, there may be exposed components
with housings or protrusions at or above line potential. Extreme care should be taken to protect
against shock. Stand on an insulating pad and make it a habit to use only one hand when checking
components. Always work with another person in case an emergency occurs. Disconnect power
before checking controllers or performing maintenance. Be sure equipment is properly grounded.
Wear safety glasses whenever working on electronic controllers or rotating machinery.
WARNING: This equipment should be installed, adjusted, and serviced by qualified electrical
maintenance personnel familiar with the construction and operation of the equipment and the hazards
involved. Failure to observe this precaution could result in bodily injury.
WARNING: HAZARD OF ELECTRICAL SHOCK. DISCONNECT INCOMING POWER
BEFORE WORKING ON THIS CONTROL.
WARNING: Wait at least five (5) minutes after turning OFF the input power supply before
performing maintenance or an inspection. Otherwise, there is the danger of electric shock.
WARNING: Do not install or remove the SJ-MB Modbus option board while the inverter is
energized. Otherwise there is the danger of electric shock and/or injury due to unexpected inverter
operation.
WARNING: Never modify the unit. Otherwise, there is a danger of electric shock and/or injury.
CAUTION: Be sure to secure the SJ-MB option board with the supplied mounting screws. Make sure
all connections are made securely; otherwise there is danger of a loose connection and unpredictable
operation.
CAUTION: Alarm connection may contain hazardous live voltage even when inverter is
disconnected. When removing the front cover for maintenance or inspection, confirm that incoming
power for alarm connection is completely disconnected.
Chapter 1
Page 6 of 36
Chapter 1
CAUTION: Be sure not to touch the surface or terminals of the SJ-MB Modbus option board while
the inverter is energized; otherwise there is the danger of electric shock.
CAUTION: The software lock modes described in the SJ300 inverter manual are NOT supported via
the SJ-MB option board. This means that network commands can bypass any software lock settings
configured via the inverter keypad. It is therefore incumbent on the user to make sure no safety
lockouts are violated through network commands.
CAUTION: When configuring parameters with the standard keypad, the inverter checks for and
inhibits invalid parameter combinations when the STR key is pressed. The SJ-MB bypasses this
check, so it is incumbent on the user to make sure invalid configuration parameters or combinations
are not sent through network commands. Otherwise undesirable inverter behavior may occur.
CAUTION: Certain parameter data ranges vary depending on model and capacity. The SJ-MB does
NOT check to make sure these data are within range. Thus it is incumbent on the user to make sure
data for these parameters is within range for the specific model and rating. These parameters are noted
in the parameter tables in the Appendix. Otherwise undesirable inverter behavior may occur.
INVERTER COMPATIBILITY
The inverter firmware revision number is embedded within the inverter Manufacturing Number, which can be
found on the product nameplate. The SJ-MB Modbus Interface option board is compatible only with SJ300 and
L300P series inverters with Revision Numbers HIGHER than those shown below.
XX
8KT XXXXX XXXXX – for SJ300-xxxXFU 0.4 kW (0.5 hp) to 55 kW (75 hp), or
L300P-xxxXFU or L300P-xxxXBRM 1.5 kW (2 hp) to 75 kW (100 hp)
EMT XXXXX XXXXX – for SJ300-xxxXFU 75kW (100 hp) to 150 kW (200 hp), or
XX
L300P-xxxXFU or L300P-xxxXBRM 90 kW
(125 hp) to 132 kW (175 hp)
Note: All inverters in the model number series L300P-xxxXFU2 are compatible with
the SJ-MB, regardless of revision number. All SJ300 and L300P models
manufactured in 2004 or later are compatible as well.
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NOTES:
Chapter 1
Page 8 of 36
(
)
Chapter 2
Chapter 2 – Installation and Wiring
Orientation to Product Features
Figure 2-1 below shows the physical layout of the SJ-MB Modbus option board. In particular, note the location
of status LEDs and DIP-switches.
Left: Termination
Right: Config
Programming
Port
RJ1 1
Jack
Modbus
Port
D+ D- GND
7 6 5 4 3 2 1 0
ON
OFF
Figure 2-1
SJ-MB Layout
Installing the Option Board
Power down the inverter and wait at least five minutes before moving to the next step. Open and remove the
lower terminal cover. Confirm that the red CHARGE LED is extinguished and that the DC bus is fully
discharged before proceeding further, otherwise there is the danger of electric shock. Then remove keypad from
the inverter. You can now remove the upper front cover to expose the two option ports inside.
Figure 2-2 on the next page shows how to install the option board to option port 1 or 2 of the inverter. There are
four holes on the corners of the option board. Align the board with the port connector in the proper orientation
(to the left, when facing the inverter as show). Then align the top two holes with the two screw holes, and the
bottom two holes with the two guide posts. Insert the board fully into the connector. Secure the board with the
two M3 screws supplied.
STATUS LEDs
• STATUS
• ERROR
• TX
• RX
Connector to
connect to
SJ300 or L300P
rear of board
RXD LED
TXD LED
DIP Switches
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Screw holes for securing the option board
Option board
Option port 1
(M3 screws x 2)
Chapter 2
Guide posts for
option board positioning
Option port 2
Figure 2-2
Installation of SJ-MB
Page 10 of 36
Chapter 2
User Interface
The SJ-MB has six LEDs to convey module status and activity.
Four LEDs next to the Modbus port connector:
• STATUS (GREEN) – This LED will be ON whenever the SJ-MB is receiving proper power from the
inverter and the self diagnostics have shown the board to be functioning normally.
• ERROR (RED) – This LED will be ON if the SJ-MB has failed due to a hardware watchdog timeout, or
the Modbus communications has been absent for the software watchdog timeout period.
MB TX – This LED is ON when the SJ-MB is transmitting Modbus data over the network.
•
• MB RX – This LED is ON when the SJ-MB is receiving Modbus data over the network.
Two LEDs near the right edge of the board:
• TXD – This LED indicates communication from the SJ-MB to the inverter through the option port.
• RXD – This LED indicates communication to the SJ-MB from the inverter through the option port.
(These two LEDs may appear blinking or may appear steady ON due to the high blink rate.)
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