Hitachi L100 Manuale Utente
“B” Group: Fine Tuning Functions
Configur
ing
Dr
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3–30
B_88: Restart Mode Configuration – You can configure how the inverter resumes
motor output control after a free-run stop. Setting B_88 determines whether the inverter
will ensure the motor always resumes at 0 Hz, or whether the motor resumes from its
current coasting speed (also called frequency matching). The Run command may turn
OFF briefly, allowing the motor to coast to a slower speed from which normal operation
can resume.
motor output control after a free-run stop. Setting B_88 determines whether the inverter
will ensure the motor always resumes at 0 Hz, or whether the motor resumes from its
current coasting speed (also called frequency matching). The Run command may turn
OFF briefly, allowing the motor to coast to a slower speed from which normal operation
can resume.
In most applications a controlled deceleration is desirable. However, applications such
as HVAC fan control will often use a free-run stop. This practice decreases dynamic
stress on system components, prolonging system life. In this case, you will typically set
B_88=01 in order to resume from the current speed after a free-run stop (see diagram
below, right). Note that using the default setting, B_88=00, can cause trip events when
the inverter attempts to force the load quickly to zero speed.
as HVAC fan control will often use a free-run stop. This practice decreases dynamic
stress on system components, prolonging system life. In this case, you will typically set
B_88=01 in order to resume from the current speed after a free-run stop (see diagram
below, right). Note that using the default setting, B_88=00, can cause trip events when
the inverter attempts to force the load quickly to zero speed.
NOTE: Other events can cause (or be configured to cause) a free-run stop, such as
power loss (see
power loss (see
terminal [FRS] signal. If all free-run stop behavior is important to your application (such
as HVAC), be sure to configure each event accordingly.
as HVAC), be sure to configure each event accordingly.
An additional parameter further configures all instances of a free-run stop. Parameter
B_03, Retry Wait Time Before Motor Restart, sets the minimum time the inverter will
free-run. For example, if B_03 = 4 seconds and the cause of the free-run-stop lasts
10 seconds, the inverter will free-run (coast) for a total of 14 seconds before driving the
motor again.
B_03, Retry Wait Time Before Motor Restart, sets the minimum time the inverter will
free-run. For example, if B_03 = 4 seconds and the cause of the free-run-stop lasts
10 seconds, the inverter will free-run (coast) for a total of 14 seconds before driving the
motor again.
B_86 Frequency scaling
conversion factor
Specify a constant to scale the
displayed frequency for D_07
monitor, range is 0.1 to 99.9
displayed frequency for D_07
monitor, range is 0.1 to 99.9
✘
1.0
1.0
1.0
—
/Hz01.0 0.00
B_87 STOP key enable
Select whether the STOP key
on the keypad is enabled, two
option codes:
00 ...enabled
01 ...disabled
on the keypad is enabled, two
option codes:
00 ...enabled
01 ...disabled
✘
00
00
00
—
STOP-SW ON
“B” Function
Run
Mode
Edit
Defaults
Func.
Code
Name /
SRW Display
Description
–FE
(CE)
–FU
(UL)
–FR
(Jpn)
Units
B_88 = 00
B_88 = 01
[FW, RV]
Motor
speed
t
Resume from 0Hz
Zero-frequency start
t
Resume from current speed
[FW, RV]
Motor
speed
B 03
Wait time
[FRS]
[FRS]