FujiFilm FRENIC5000G11S Series, Technical Information

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2-35
Chapter 2
3. Function Explanation
2
NOTE: The dotted-dashed line indicates motor speed.
■
H10 Energy-saving operation
When the output frequency is fixed (constant-speed operation)
at light loads and value other than 0.0 is set to “F09 Torque
boost 1,” this function automatically reduces the output
voltage, while minimizing the product (power) of voltage and
current.
- Set value 0: Inactive
1: Active
NOTES:
- Use this function for variable torque loads (e.g., fans, pumps). When
used for a constant-torque load or rapidly changing load, this
function causes a delay in control response.
- The energy-saving operation automatically stops during acceleration
and deceleration and when the torque limiting function is activated.
■
H11 DEC mode
This function selects the inverter stopping method when a stop
command is entered.
- Set value 0: Deceleration-to-stop based on data set to “H07
ACC/DEC pattern”
1: Coasting-to-stop
NOTE:
This function is effective only when a stop command is entered and,
therefore, is ineffective when the motor is stopped by lowering the set
frequency
CM
STM
FWD
0.1s or
longer
0.2s or longer
ON
ON
In this section, the output voltage
is gradually increased in steps to
minimize shock.
Time
Output frequency
(motor speed)
Speed search Acceleration
H10 ENERGY SAV
H11 DEC MODE
■
H12 Instantaneous overcurrent limiting
• An overcurrent trip generally occurs when current flows
above the inverter protective level following a rapid change in
motor load. The instantaneous overcurrent limiting function
controls inverter output and prohibits the flow of a current
exceeding the protective level even when the load changes.
• As the operation level of the instantaneous overcurrent
limiting function cannot be adjusted, the torque limiting
function must be used.
• As motor generation torque may be reduced when instanta-
neous overcurrent limiting is applied, set this function to be
inactive for equipment such as elevators, which are ad-
versely affected by reduced motor generation torque, in
which case an overcurrent trip occurs when the current flow
exceeds the inverter protective level. A mechanical brake
should be used to ensure safety.
- Set value 0: Inactive
1: Active
■
H13 Auto-restart (Restart time)
Instantaneous switching to another power line (when the
power of an operating motor is cut off or power failure occurs)
creates a large phase difference between the line voltage and
the voltage remaining in the motor, which may cause electrical
or mechanical failure. To rapidly switch power lines, write the
remaining voltage attenuation time to wait for the voltage
remaining in the motor to attenuate. This function operates at
restart after a momentary power failure.
- Setting range: 0.1 to 10.0s
When the momentary power failure time is shorter than the
wait time value, a restart occurs following the wait time. When
the power failure time is longer than the wait time value, a
restart occurs when the inverter is ready to operate (after
about 0.2 to 0.5s).
■
H14 Auto-restart (Frequency fall rate)
This function determines the reduction rate of the output
frequency for synchronizing the inverter output frequency and
the motor speed. This function is also used to reduce the
frequency and thereby prevent stalling under a heavy load
during normal operation.
- Setting range: 0.00, 0.01 to 100.00Hz/s
When 0.00 is set, the frequency is reduced according to the
set deceleration time.
NOTE:
A too large frequency fall rate may temporarily increase the regenera-
tion energy from the load and invoke the overvoltage protective
function. Conversely, a rate that is too small extends the operation
time of the current limiting function and may invoke the inverter
overload protective function.
H12 INST CL
H14 FALL RATE
H13 RESTART
Chapter02J(P26˜43).p65
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