Accel - Hitachi NT2021XA Instruction Manual

Chapter 2 Syntax
Variable name

ACCEL

Acceleration time setting
- Explanation
This variable can be used to read and write the motor acceleration time in the inverter. The acceleration time setting using this
variable is enabled only when the setting of accel/decel time input selection (P031) is "03" (PRG). (The setting of this variable
does not correspond to the setting of inverter parameter "F002".) The data written to this variable is not stored in the inverter's
EEPROM. This variable will restore the initial setting when the inverter power is turned off.
Note 1 : Default (the inverter power is turned on) acceleration time follows the setting of inverter parameter "F002",
"F202", or "F302". For details, refer to the Inverter Instruction Manual.
Note 2 : When a program writes a value to this variable, the value is reflected in the inverter in a 40-ms cycle, which
conforms to the standard inverter specifications.
- Sample program : Program to change the acceleration time according to output frequency
(Code area [Code Window])
Label Mnemonic
SET-Freq=
ACCEL=
FW=
LOOP if
if
if
if
if
if
if
goto
LBL1 ACCEL=
goto
LBL2 ACCEL=
goto
LBL3 ACCEL=
goto
LBL4 ACCEL=
goto
LBL5 ACCEL=
goto
LBL6 ACCEL=
LBL7 goto
LBL8 Y(00)=
(Data area [Data Window])
U (00) = 500
U (01) = 1000
U (02) = 3000
U (03) = 5000
U (04) = 5500
U (05) = 6000
(Parameters)
A001 = 07
Range of values
1 to 360000
parameter1 parameter2 parameter3
6000
1000
1
FW < U(00)
FM < U(01)
FM < U(02)
FM < U(03)
FM < U(04)
FM < U(05)
FM >= U(05)
LBL7
1000
LBL7
500
LBL7
100
LBL7
500
LBL7
1000
LBL7
2000
LOOP
1
: Set the frequency of 5 Hz in variable "U (00)".
: Set the frequency of 10 Hz in variable "U (01)".
: Set the frequency of 30 Hz in variable "U (02)".
: Set the frequency of 50 Hz in variable "U (03)".
: Set the frequency of 55 Hz in variable "U (04)".
: Set the frequency of 60 Hz in variable "U (05)".
P031 = 03
Default Unit
0.01
Note 1
second
parameter4 parameter5
then LBL1
then LBL2
then LBL3
then LBL4
then LBL5
then LBL6
then LBL8
2-36
Data size Attribute
Unsigned Readable
2-word data and writable
: Set the output frequency to 60 Hz.
: Set the acceleration time to 10 seconds.
: Start forward rotation of the motor.
: When the output frequency is less than 5 Hz,
set the acceleration time to 10 seconds.
: When the output frequency is less than 10 Hz,
change the acceleration time to 5 seconds.
: When the output frequency is less than 30 Hz,
change the acceleration time to 1 second.
: When the output frequency is less than 50 Hz,
change the acceleration time to 5 seconds.
: When the output frequency is less than 55 Hz,
change the acceleration time to 10 seconds.
: When the output frequency is less than 60 Hz,
change the acceleration time to 20 seconds.
: When the output frequency reaches or
exceeds 60 Hz, end acceleration.
: Turn Y (00) on when acceleration ends.