“B” Group: Fine Tuning Functions
Configur
ing
Dr
iv
e P
a
ra
m
e
ters
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.
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.
NOTE:
Other events can cause (or be configured to cause) a free-run stop, such as
power loss (see
“Automatic Restart Mode” on page 3–22
terminal [FRS] signal. If all free-run stop behavior is important to your application (such
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_86 Frequency scaling
conversion factor
Specify a constant to scale the
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
✘
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]
Содержание L100 Series
Страница 145: ...Inverter System Accessories In This Chapter page Introduction 2 Component Descriptions 3 Dynamic Braking 5 5 ...
Страница 168: ...Glossary and Bibliography In This Appendix page Glossary 2 Bibliography 8 A ...
Страница 176: ...Drive Parameter Settings Tables In This Appendix page Introduction 2 Parameter Settings for Keypad Entry 2 B ...
Страница 183: ...CE EMC Installation Guidelines In This Appendix page CE EMC Installation Guidelines 2 Hitachi EMC Recommendations 6 C ...
Страница 186: ...CE EMC Installation Guidelines Appendix C C 4 L1 L2 L3 PE M 3 L100 inverter with footprint type filter ...
Страница 187: ...L100 Inverter Appendix C C 5 L1 L2 L3 PE L100 inverter with book type filter M 3 ...