Delta VFD185B43A User Manual

Chapter 5 Parameters_VFD-B Series
Revision 10/2005, BE13, SW V4.08 5-99
RTU mode:
Address
01H
Function 03H
21H Starting data address
02H
00H Number of data
(count by word)
02H
CRC CHK Low 6FH
CRC CHK High F7H
CRC (Cyclical Redundancy Check) is calculated by the following steps:
Step 1: Load a 16-bit register (called CRC register) with FFFFH.
Step 2: Exclusive OR the first 8-bit byte of the command message with the low order byte of the 16-
bit CRC register, putting the result in the CRC register.
Step 3: Examine the LSB of CRC register.
Step 4: If the LSB of CRC register is 0, shift the CRC register one bit to the right with MSB zero filling, then
repeat step 3. If the LSB of CRC register is 1, shift the CRC register one bit to the right with MSB
zero filling, Exclusive OR the CRC register with the polynomial value A001H, then repeat step 3.
Step 5: Repeat step 3 and 4 until eight shifts have been performed. When this is done, a complete 8-bit
byte will have been processed.
Step 6: Repeat step 2 to 5 for the next 8-bit byte of the command message. Continue doing this until all
bytes have been processed. The final contents of the CRC register are the CRC value. When
transmitting the CRC value in the message, the upper and lower bytes of the CRC value
must be swapped, i.e. the lower order byte will be transmitted first.
The following is an example of CRC generation using C language. The function takes two arguments:
Unsigned char* data Å a pointer to the message buffer
Unsigned char length Å the quantity of bytes in the message buffer
The function returns the CRC value as a type of unsigned integer.
Unsigned int crc_chk(unsigned char* data, unsigned char length){
int j;
unsigned int reg_crc=0xFFFF;
while(length--){
reg_crc ^= *data++;
for(j=0;j<8;j++){

Delta VFD185B43A Specifications

General

IP Rating	IP20
Model	VFD185B43A
Category	DC Drives
Series	Delta VFD
Phase	3

Summary

Chapter 2 Installation and Wiring

Installation

Detailed instructions on how to physically mount and install the AC motor drive unit.

Wiring

General information and precautions regarding the wiring of the AC motor drive.

Chapter 3 Start Up

Preparations before Start-up

Essential checks and preparations to be performed before powering on the AC motor drive.

Chapter 4 Digital Keypad Operation

How to Operate the Digital Keypad VFD-PU01

Step-by-step guide on operating the VFD-PU01 digital keypad for various functions.

Chapter 5 Parameters

Summary of Parameter Settings

A summary of available parameters, grouped by function, with their factory settings.

Description of Parameter Settings

Detailed explanations for individual parameters, their ranges, and functions.

Chapter 6 Fault Code Information

Common Problems and Solutions

A table listing common fault names, descriptions, and corresponding corrective actions.

Chapter 7 Troubleshooting

Over Current (OC)

A flowchart guiding troubleshooting steps for over-current faults (ocA, ocd, OC).

Low Voltage (Lv)

Troubleshooting steps for low voltage (Lv) faults, including power supply checks.

Motor cannot Run

A flowchart for diagnosing why the motor cannot run, covering power, settings, and wiring.

Chapter 8 Maintenance and Inspections

Appendix C How to Select the Right AC Motor Drive

Capacity Formulas

General Precaution