Hitachi WJ C1 Series User Manual

Chapter 11 RS485 Communication
11-2-12
11.2.10 Storing Changes to Holding Registers
 How to store the write data to the holding register in the non-volatile memory of the inverter?
 When the write command to the holding register (06h, 10h, 17h) is executed, the written value
is enabled, but it is not stored in the non-volatile memory inside the inverter, and the change
contents will disappear due to power shutdown. To store the change of the holding register in
the non-volatile memory, execute the following "ENTER instruction" or "Single write mode
command" separately.
 ENTER instruction must also be executed when changing motor control-related parameters such
as motor constants shown below. If the ENTER instruction is not executed, the internal control
variable is not recalculated due to parameter change, so the operating characteristics of the
motor will not change.
■ List of parameters for which internal control variable recalculate is required
Code
Item
Code
Item
[A003]
*1
Base frequency
[H002]
*1
Async. motor constant selection
[A004]
*1
Maximum frequency
[H003]
*1
Async. motor capacity
[A044]
*1
Control mode selection
[H004]
*1
Async. motor number of poles
[A082]
*1
Motor rated voltage
[H005]
*1
Async. motor speed response
[b112]
Free-V/f frequency 7
[H020]
*1
to [H034]
*1
Various async. motor constants
*1. "2nd-motor control [SET]" target parameter. The second control parameter is also subject to setting.
Storing changed data in non-volatile memory by ENTER instruction
 Execute the ENTER instruction when storing the changed data in the non-volatile memory at
once or when recalculating the internal control variables by changing the motor constant, etc.
 The desired operation is executed by writing the following values to the holding register "0900h"
using the write holding register [06h], etc.
 Determine the completion of the ENTER instruction by monitoring the "Write data in progress
signal (coil No. 0049h)".
 To recalculate the motor constant, enter 0000h or 0002h in the holding register "0900h".
Write command
Holding register
Set value
Operation details
ENTER instruction
0900h
0000
Recalculates internal control variables when
changing motor constants, etc.
0001
Stores the change to the holding register in
the non-volatile memory.
0002 to FFFF
Perform both above
■ ENTER instruction
Parameter change
ENTER instruction
0900h=1
Write all data to non-
volatile memory
External control
equipment
Inverter
Write to RAM
Write to RAM
Write to RAM
Parameter change
Parameter change
A
Q
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Hitachi WJ C1 Series Specifications

General

Brand	Hitachi
Model	WJ C1 Series
Category	Inverter
Language	English