Toshiba TOSVERT VF-A7 Parts list manual

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TOSVERT VF-A7/P7
The function manual of the parameter
“F451” “F452” “F453”
This manual is intended only to describe the typical operation and application of the
product. The technical information contained in this manual does not guarantee the
intellectual proprietary rights or other rights of, or grant a license to, the Toshiba
Schneider Inverter Corporation or third parties, for the use of the technical information or
of the product.
© Toshiba Schneider Inverter Corporation 2003
All rights reserved.

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1. Introduction
Thank you for your purchase of our industrial inverter “TOSVERT VF-A7/P7”.
This manual gives explanations of parameters “H, H, H” for the VF-A7/P7 inverter.
2. Functions
In the case the inverter is applied to lifting machines (crane, hoist, etc.), these parameters are used for
cooperation with the mechanical brake operation (H) and load falling prevention in winding up/down
operation (H, H).
3. Related parameters
Vector control
Title
Commu-
nication
No
Function Adjustment range
Min. unit (panel/
communication)
Default
setting
Write during
running Speed
control
Torque
control
Position
control
V/f
Constant
H 0451 Torque limit mode
0: Standard,
1: without speed
cooperation
−0 Enabled ●/●− − ●
H 0452
Continuous stall trip
detection
time during power running
0.0〜1.0 [s] 0.01/0.01 0.0 Enabled ●/●− − ●
H 0453 Stall prevention during
regeneration
0: Stall
1: Stall is prevented −0 Enabled ●/●− − ●
Sensorless vector/vector with sensor ( ● : Valid，−: Invalid)

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4. Function of parameter H
H = 0 mode (standard)
H = 1 mode (without speed cooperation)
Operation frequency is controlled
when torque limit is activated.
Therefore, actual speed is
controlled to follow the operation
frequency always.
Since the operation frequency is
raised after torque declines with
release of the mechanical brake,
the time that the actual speed
corresponds to the operation
frequency is time lag in
mechanical brake operation +
acceleration time.
When the inverter is used in combination with the mechanical brake of a lifting machine (crane, hoist,
etc.), the load fall by torque reduction can be prevented by carrying out the shortest acceleration of the
mechanical brake operation delay time.
Moreover, this parameter raises response in inching operation in order to control the load not to slip
down.
Frequency [Hz]
Time [s]
Torque [N⋅m]
Time [s]
Torque limit
level
A
ctual speed
When torque limit is
not activated
Operation frequency
Time [s]
Mechanical
brake
ON OFF
(Released)
Operation frequency becomes
high ahead of torque limit even
when it is activated.
When torque declines with release
of the mechanical brake, it is
sustained at the limit level and
actual speed is controlled to follow
the operation frequency.
This mode functions not only to
prevent the load from falling but to
raise response in inching
operation.
Frequency [Hz]
Torque [N⋅m]
Time [s]
Torque limit
level
A
ctual speed
(Acceleration rate is determined
by torque limit.)
Operation frequency
Time [s]
Time [s]
Mechanical
brake
ON OFF
(Released)
Torque limit is sustained after
the mechanical brake is
released.

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5. Function of parameter H
H = 0.0 mode (power running without continual stall prevention trip)
H = except 0.0 (power running with continual stall prevention trip)
If stall prevention trip
continually takes place in
lifting operation with overload
(power running), output
frequency is automatically
lowered in order to control the
current. If worst comes to
worst, the load falls because
of a stall.
If stall prevention trip
continually takes place in
lifting operation (power
running) (in the continuos
hours set byH),QV
(overtorque) prevention trip
takes place to prevent the
load from falling caused by
overload.
Frequency [Hz]
Time [s]
Time [s]
Stall prevention
trip level
When stall prevention
is not activated
Operation
frequency
In stall prevention trip
Output current [%]
Falling direction in winding
up operation of lifting
machines.
When the inverter is used in combination with a lifting machine (crane, hoist, etc.), this function
prevents the load from falling because of a stall in overload hoisting (power running).
Frequency [Hz]
Time [s]
Time [s]
Stall prevention
trip level
When stall prevention
is not activated Operation frequency
H
Output current [%]
QV (overtorque) prevention
trip resulting from continual
stall prevention trip in the set
hours.

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6. Function of parameter H
H = 0 mode (stall in regeneration)
H = 1 mode (stall is prevented in regeneration)
Frequency [Hz]
Time [s]
Time [s]
Stall prevention
trip level
When stall prevention
is not activated
Operation frequency
Output current [%]
If stall prevention trip takes
place in winding up operation
(in regeneration), output
current is automatically
increased in order to control
the current. If worst comes to
worst, the load may fall.
Falling direction in winding
down operation of lifting
machines.
Stall prevention is controlled
only in winding down operation
(in regeneration) in order to
prevent the load from falling
and other accidents caused by
unexpected rise in the output
frequency.
When the inverter is used in combination with a lifting machine (crane, hoist, etc.), this function
controls stall prevention in winding down operation (in regeneration) in order to prevent the load from
falling and accident caused by unexpected speed change.
Frequency [Hz]
Time [s]
Time [s]
Stall prevention
trip level
When stall prevention
is not activated
Operation frequency
Output current [%]
When output current increases, the
load is prevented from falling by
QE trip and QN trip.