12.3 Common Specifications
12-16
Table 12.3-3
Frequency limiter
(upper limit and
lower limit
frequencies)
∙ Specifies the upper and lower frequencies in Hz.
∙ Processing can be selected when the reference frequency is less than
the lower limit (F16). (The output frequency will be maintained at the
lower limit/motor decelerates and stops.)
∙ Setting is possible with analog input terminals [12], [C1] (C1 function, V3
function) and [V2].
Frequency/PID
command bias
Bias of reference frequency and PID command can be independently set
(setting range: 0 to ±100%).
∙ Gain: Setting range from 0 to 400%
∙ Offset: Setting range from -5.0 to +5.0%
∙ Filter: Setting range from 0.00 to 5.00 s
Six operation points and their common jump width (0 to 30.0 Hz) can be
set.
Operation with key (standard keypad), or keys
(multi-function keypad), or digital contact inputs “FWD” or “REV”
(Exclusive acceleration/deceleration time setting, exclusive frequency
setting)
Restart mode after
momentary power
failure
∙ Trip immediately: Trip immediately at the time of power failure.
∙ Trip after recovery from power failure:
Coast to a stop at the time of power failure and trip when the power
is recovered.
∙ Trip after decelerate-to-stop:
Deceleration stop at power failure, and trip after stoppage
∙ Continue to run: Operation is continued using the load inertia energy.
∙ Start at the frequency selected before momentary power failure:
Free run at power failure and start after power recovery at the
frequency selected before momentary stop.
∙ Start at starting frequency:
Free run at power failure and start at the starting frequency after
power recovery.
Limits the current by hardware to prevent an overcurrent trip from being
caused by fast load variation or momentary power failure, which cannot be
covered by the software current limiter.
This limiter can be canceled.
Current limiting
(software current
limiter)
∙ Automatically reduces the frequency so that the output current becomes
lower than the preset operation level. (This limiter can be canceled.)
∙ The operation can be selected (operation at constant speed only,
operation when accelerating and at constant speed).
Operation by
commercial power
supply
∙ With commercial power selection commands (“SW50”, “SW60”), the
inverter outputs 50/60 Hz.
∙ Commercial switching sequence built in
Compensates for decrease in speed according to the load.
Decreases the speed according to the load torque.
∙ Switchable between 1st and 2nd torque limit values.
∙ Torque limiting/torque current limiting/power limiting for each quadrant
∙ Analog torque limit input
Automatically reduces the frequency so that the output current becomes
lower than the preset operation level.
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