Hitachi L100 IP Series, Инструкция по эксплуатации

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Chapter 8 – Using the digital operator
8-6
Function Display
*
) Function description / parameter setting range
Standard
setting
Voltage/frequency characteristics, boost
V
f in Hz
5.0
0
100%
25.0
A 43 =10%
50.0Hz
A 42 =50%
Parameter settings:
A 41
=00
A 42
=50
A 43
=10.0
A 44
=00
A 45 =100
Boost selection
method
A 41 N
Selection of:
00: manual boost
or 01: automatic boost
00
Voltage rise,
manual boost
A 42 Y
The amount of voltage rise in manual boost mode can be set in the
range of 0% to 99%.
11
Manual boost fre-
quency adjustment
A 43 Y
The frequency where the highest voltage rise exists can be set in the
range of 0% to 50% of the base frequency.
10.0
Voltage/frequency
characteristic
A 44 N
V
100%
0 f
constant
quadratic
00
Output voltage gain A 45 Y
V
100%
0
f
50%
100
Function Display
*
) Function description / parameter setting range
Standard
setting
DC braking
L100IP series inverters have a configurable DC brake that is activated as soon as the stop command is issued. By
applying a strobed DC voltage to the motor’s stator a braking torque is induced into the rotor that effectively works
against the rotation of the motor. Usage of the DC brake makes possible high registration accuracy when carrying
out positioning work.
CAUTION Usage of the DC brake causes an additional heating of the motor. For this
reason the DC brake should be configured with as short a braking torque and
braking time as possible.
DC brake
active / not active
A 51 N
00: DC brake is not used (not)
01: DC brake is used (active)
00
DC brake
frequency
A 52 N
The DC brake will be activated as soon as the actual output frequency
falls below the frequency entered here. Setting range 0.5Hz–10Hz.
0.5
DC brake
waiting time
A 53 N
When the frequency set under A 52 is reached the motor runs free for
the duration entered here. Only after this duration the DC brake is
activated. Setting range 0.0s–5s.
0.0
DC brake
braking torque
A 54 N The amount of braking force can be entered here. Setting 0%–100%. 0
DC brake
braking time
A 55
N
The time during which the DC brake is activated can be configured
from 0.0s through 60s.
0.0
00: Constant V/F characteristic (constant torque)
01: Quadratic V/F characteristic (reduced torque)
Output voltage can be set in
the range of von 50% to
100% of the input voltage.
The boost causes a higher voltage (and consequently higher
torque) in the lower frequency range. The manual boost raises
voltage in the frequency range from start frequency (standard
setting of 0.5Hz) to half of the base frequency (25Hz at a
standard setting of 50Hz) in any one of the operating stages
(acceleration, normal operation, deceleration) independently of
motor load.
In contrast to this, the automatic boost is activated depending
on motor load. A voltage rise can cause a trip due to the higher
current involved.
A variable (quadratic) or
constant V/F characteristic
can be chosen for accele-
rating and decelerating the
motor.