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首页施耐德变频器ATV303 Modbus通讯手册.pdf
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S1A94572
www.schneider-electric.com
2354235 11/2008
Altivar 303
Variable speed drives
for asynchronous motors
Modbus Communication Manual
06/2012
S1A94572 06/2012 3
Contents
Important Information __________________________________________________________________________________________ 4
Before you begin______________________________________________________________________________________________ 5
Documentation structure________________________________________________________________________________________ 6
Presentation _________________________________________________________________________________________________ 7
Connection to RS485 bus_______________________________________________________________________________________ 8
Configuration of the Modbus serial port ____________________________________________________________________________ 9
IO Scanner configuration parameters_____________________________________________________________________________ 10
Modbus Functions ___________________________________________________________________________________________ 12
ATV303 state machine ________________________________________________________________________________________ 17
Application example __________________________________________________________________________________________ 21
Connection to RS485 bus______________________________________________________________________________________ 24
4 S1A94572 06/2012
Important Information
NOTICE
Read these instructions carefully, and look at the equipment to become familiar with the device before trying to install, operate, or maintain
it. The following special messages may appear throughout this documentation or on the equipment to warn of potential hazards or to call
attention to information that clarifies or simplifies a procedure.
PLEASE NOTE
The word "drive" as used in this manual refers to the controller portion of the adjustable speed drive as defined by NEC.
Electrical equipment should be installed, operated, serviced, and maintained only by qualified personnel. No responsibility is assumed by
Schneider Electric for any consequences arising out of the use of this material.
© 2012 Schneider Electric. All Rights Reserved
DANGER
DANGER indicates an imminently hazardous situation, which, if not avoided, will result in death or serious injury.
WARNING
WARNING indicates a potentially hazardous situation, which, if not avoided, can result in death or serious injury.
CAUTION
CAUTION indicates a potentially hazardous situation, which, if not avoided, can result in minor or moderate injury.
CAUTION
CAUTION, used without the safety alert symbol, indicates a potentially hazardous situation which, if not avoided, can
result in property damage.
The addition of this symbol to a Danger or Warning safety label indicates that an electrical hazard exists, which will result in
personal injury if the instructions are not followed.
This is the safety alert symbol. It is used to alert you to potential personal injury hazards. Obey all safety messages that follow
this symbol to avoid possible injury or death.
S1A94572 06/2012 5
Before you begin
Read and understand these instructions before performing any procedure with this drive.
DANGER
HAZARD OF ELECTRIC SHOCK, EXPLOSION, OR ARC FLASH
• Read and understand this manual before installing or operating the ATV303 drive. Installation, adjustment, repair, and maintenance
must be performed by qualified personnel.
• The user is responsible for compliance with all international and national electrical code requirements with respect to grounding of all
equipment.
• Many parts of this drive, including the printed circuit boards, operate at the line voltage. DO NOT TOUCH. Use only electrically
insulated tools.
• DO NOT touch unshielded components or terminal strip screw connections with voltage present.
• DO NOT short across terminals PA/+ and PB.
• Before servicing the drive:
- Disconnect all power, including external control power that may be present.
- Place a “DO NOT TURN ON” label on all power disconnects.
- Lock all power disconnects in the open position.
- WAIT 15 MINUTES to allow the DC bus capacitors to discharge. Then follow the “Bus Voltage Measurement Procedure” (see
User manual) to verify that the DC voltage is less than 42 V. The drive LEDs are not indicators of the absence of DC bus
voltage.
• Install and close all covers before applying power or starting and stopping the drive.
Failure to follow these instructions will result in death or serious injury.
DANGER
UNINTENDED EQUIPMENT OPERATION
• Read and understand this manual before installing or operating the ATV303 drive.
• Any changes made to the parameter settings must be performed by qualified personnel.
Failure to follow these instructions will result in death or serious injury.
WARNING
DAMAGED DRIVE EQUIPMENT
Do not operate or install any drive or drive accessory that appears damaged.
Failure to follow these instructions can result in death, serious injury, or equipment damage.
WARNING
LOSS OF CONTROL
• The designer of any control scheme must consider the potential failure modes of control paths and, for certain critical control functions,
provide a means to achieve a safe state during and after a path failure.
Examples of critical control functions are emergency stop and overtravel stop.
• Separate or redundant control paths must be provided for critical control functions.
• System control paths may include communication links. Consideration must be given to the implications of unanticipated transmission
delays or failures of the link.
a
Failure to follow these instructions can result in death, serious injury, or equipment damage.
a. For additional information, refer to NEMA ICS 1.1 (latest edition), “Safety Guidelines for the Application, Installation, and Maintenance
of Solid State Control” and to NEMA ICS 7.1 (latest edition), “Safety Standards for Construction and Guide for Selection, Installation and
Operation of Adjustable-Speed Drive Systems.”
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