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113
1
S
PECIFI
C
A
T
IONS
SPECIFICATIONS
3) When the output phase loss protection does
not function
When the motor capacity is too small as compared
to the inverter capacity, the output current becomes
too small. At this time, when the average output
current of all phases is 5% or less of the rated
inverter current, the output phase loss protection
(E.LF) does not function assuming that all phases
is 0A even if one of the three phases is lost since
all phases enter the dead zone (assumed as 0A if
within 5% of the rated inverter current value).
When multiple motors are operated by a single
inverter, output phase loss protection (E.LF) does
not function.
The output phase loss protection (E.LF) functions
when one phase is lost. This function is invalid if
two phases or three phases are lost. Note that it
may functions even if two phases are lost when an
earth (ground) fault occurs. When an earth
(ground) fault occurs in the lost phase, output
phase loss protection (E.LF) may not function.
1.5.10 Inverter status and reset method at occurrence of fault
(common)
*1
If a fault has occurred, the IGBT gate is instantly shut off to stop the output. Hence, the inverter power may remain ON. If the
power is switched OFF by using the MC etc., the inverter control power is lost and the fault signal cannot be output. To keep
only the fault signal ON, keep the fault output contact (across terminals A-C) closed in the external circuit. The fault description
is stored in the inverter and can be read later.
The output currents of all phases
are 5% or less than the rated current (dead zone)
Since in the dead zone, currents of all phases
are considered as 0A
U phase current
V phase current
W phase current
Output current
Time
5% of the
rating
common
Inverter Status
Fault Occurrence
Reset terminal Connected
Output Stop Terminal Connected
IGBT
Gate is shut OFF instantly.
Gate is shut OFF instantly.
Gate is shut OFF instantly.
Frequency meter display
Reset to 0Hz instantly
Reset to 0Hz instantly
Reset to 0Hz instantly
Operation panel
Fault code indication
Short terminals to erase the
indication once.
Keep RES signal ON to display
Value being monitored is reset to 0
instantly. Note that this depends on
the data monitored.
Parameter unit display
Fault description display
Frequency, current, et., at fault
occurrence can be read in the
monitor mode.
Short terminals to erase the
indication once.
Keep RES signal ON to display
(flicker) the communication fault
display screen.
Frequency and current at fault
occurrence are cleared.
Value being monitored is reset to 0
instantly. Note that this depends on
the data monitored.
Fault output (relay output)
Excited instantly (terminals B-C
open)
Drops instantly (terminals B-C
closed)
No operation
RUN signal
Switched OFF instantly.
Switched OFF instantly.
Switched OFF instantly.
SU signal
Switched OFF instantly.
Switched OFF instantly.
Switched OFF instantly.
Reset method
Reset or switch the power OFF,
then ON
Turn OFF RES signal
Turn OFF MRS signal
Summary of Contents for FR-A700 Series
Page 245: ...279 2 PARAMETER PARAMETER MEMO ...
Page 440: ...474 PARAMETER MEMO ...
Page 522: ...556 SELECTION MEMO ...