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U11 Cooling Fan operating time
The integrated operating hours of the cooling
fan are displayed. Since the integrated hours
are counted by unit hours, power input for
less than one hour will be disregarded. The
integrated
hours
TFAN=xxxxxh of maintenance information.
The standard replacement time is 40,000h for
inverter of 4.0kW or less. The standard
replacement time is 25,000h for inverter of
5.5kW or more. Estimated life expectancy of a
cooling-fan at inverter ambient temperature of
40°C.
The displayed value should be considered as
a rough estimate because the actual life of a
cooling fan is influenced significantly by the
temperature. Refer to the manual "8-2
Periodic Inspection " for information.
U 1 1
U S E R
Setting range : 0 to 65535 hours
Clear integrated operating time to 0 hour after
replacing the cooling fan.
U13 Magnetising current damping gain
Adjust if magnetizing current instability occurs
in the inverter output current .
U 1 3
U S E R
Setting range: 0 to 65535
Adjust the value from 0 to 2048 as a standard
value. Damping is at maximum at set value of
4096.
U15 Slip compensation filter time constant
The filter time constant of Slip compensation
is set.
U 1 5
U S E R
Setting range : 0 to 32767
Calculate the filter time constant using the
following formula.
5 Function Selection
are
displayed
in
1 1
Related Functions
E20~E24
(Set value :30)
1 3
1 5
121
Filter time constant
"U15" set value
Note: Response time is faster when the set
value is bigger. Therefore, there is a possibility
that the output frequency may become unstable.
It may be necesary to adjust set value to smaller
than factory set value.
U23 Integral gain of continuous operation
at power failure
U24 Proportional gain of continuous
operation at power failure
This function becomes effective, when
function code F14 (Restart mode after
momentary power failure) set value is 2 or 3.
U 2 3
U S E R
U 2 4
U S E R
Setting range : 0~65535
In case of F14 set value : 2.
When the operation continuation level (H15)
is reached, deceleration to a stop occurs. The
DC voltage of the main circuit sharpens the
deceleration slope, and the inverter collects
the inertia energy of the load to maintain the
DC bus voltage and controls the motor until it
stops, so that the undervoltage protection
function is not activated.
The deceleration slope is adjusted with U23
and U24.
However, the deceleration operation time
never
becomes
longer
deceleration time.
In case of F14 set value : 3.
The output frequency is lowered by the
control by and the DC voltage of the main
circuit is kept constant from the regeneration
energy, so that the inverter may continue
operation when momentary power failure
occurs.
The response is adjusted with U23 and U24
at this time.
Calculate the integral gain using the following
formula
Integral gain =
"U15" set value
16
2
[ms]
2 3
2 4
than
the
set
16
2
[ms]
5-69
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