5
6
This makes it ideals for cranes, mining machinery, refrigerator, presses,
compressers, crushing machine and other machinery that require a high
torque and large capacity.
*1: Photos of machinery are for illustrative purposes only.
This makes the inverter ideal for process lines, printing machines,
coilers/uncoilers.
*1:Photos of machinery are for illustrative purposes only.
For machinery that reguires high torque and a large capacity
• Motor constants required for vector control can be easily set by
auto-tuning to enable 1:120 speed control. Moreover, the VF-
AS1 also features a robust structure that is unlikely to be
influenced by motor temperature.
• On inverters provided with a sensor, high-torque operation of
200%*
2
from zero velocity is possible, achieving a speed
control range of 1:1000.
• High-speed response frequencies of 40 Hz without sensor and
50 Hz with sensor are achieved respectively, to maintain fixed
speed in response to sudden changes in load.
• Modifying software enables high-frequency output up to 1000
Hz, which is ideal for spindle rotation of woodworking and
metalworking machinery.
*2: When a TOSHIBA standard 3-phase, 0.4 to 3.7 kW 4-pole motor are
driven.
Excellent Motor Control Performance
Brake sequence/light-load, high-speed functions
• The inverter has two built-in functions, the brake sequence function and
light-load, high-speed function, as standard. The brake sequence function
measures the timing with braking by an external motor to achieve smooth
operation at start and stop of braking operation. The light-load, high-speed
function automatically increases the speed when operating light loads
according to the lifting load to improve conveyance efficiency. A learning
function for setting and storing to memory required parameters while
performing actual operations is also provided to facilitate adjustments.
Built-in transistor for dynamic braking
• The VF-AS1 has a built-in transistor for dynamic braking up to 160 kW,
which makes it ideal for lifting applications.
Dedicated Functions Ideal for Lifting Applications
For system devices that requires flexibility
• With “My function”, you can create programs containing
up to 28 steps. This achieves logic operations and internal
data operations. Parameters can also be set according to
analog input and minimum-peak hold of analog outputs.
For example:
(Ex.1)
(Ex.2)
(Ex.3)
(Ex.4)
Inverter is automatically switched to commercial operation
without the external sequence when the inverter is tripped.
A signal is output when torque reaches 120% and frequency
is 5 Hz.
“Forward rotation operation,” “preset-speed operation
frequency 3” and “No.2 acceleration/deceleration” are
simultaneously turned ON by input on a single terminal.
The acceleration/deceleration time is changed dynamically
by a voltage within the range 0 to 10 V.
Customizing by “My Function”
RS-485 communications
• RS-485 communications is equipped as standard,
and Modbus-RTU protocol is supported in addition
to TOSHIBA protocol.
Network options
• Use of communication options enables support of
DeviceNet*
2
, PROFIBUS and CC-Link and other
main fieldbuses.
Data tracing
• The PCM001Z communications software allows you
to edit, monitor, and trace parameter data on a PC,
enabling easier data management from inverter
startup through to maintenance.
*2: DeviceNet is a registered trademark of ODVA (Open DeviceNet Vendor
Association).
Communications and Network
Programmable
controller
300
Torque [%]
Speed [min-
1
]
200
100
0
-100
-200
-300
200
400
600
800
1000
1200
1400
1600
1800
2000
2200
2400
My function
Number of program steps : 28
Internal relays
: 8
Internal counters
: 2
Logic commands
: ST, STN, AND,
ANDN, OR, ORN,
SET, RSET,
HOLD
ON/OFF DELAY TIMER
Data commands
: EQ, NE, GT, GE,
LT, LE, ASUB
0
100 200
300
400 500
600 700 800
900 1000
Time [ms]
0
100 200
300
400 500
600 700 800
900 1000
Time [ms]
Motor speed
Speed reference
Load
torque
Current
Motor speed
Speed reference
Load
torque
Current
Example of torque characteristics
Speed response to
reference changes
Setup by teaching
Speed recovery
response
*1: When a TOSHIBA standard 3-phase,
200 V - 2.2 kW 4-pole motor is driven,
(Note, however, that torque differs according to voltage and capacity.)
Fast response
Fast recovery against
impact load
5
Point
7
Point
8
Point
6
Point
