5.3 Description of Function Codes
5-176
H70
Overload prevention control
Specifies the rate of decrease of the output frequency of overload prevention control. Before the inverter generates
a heat sink overheat or overload trip (alarm
0h1
or
0lu
), the output frequency of the inverter is decreased for
avoiding a trip. This is applied when operation is required to continue in a system in which the load decreases as
the output frequency decreases, such as a pump.
H70 data Function
0.00 Uses the deceleration time currently selected (F08, E11, E13, E15, etc.).
0.01 to 100.0 Decelerates at a deceleration rate of 0.01 to 100.0 (Hz/s).
999 Cancel overload prevention control
■ Overload prevention controlling – “OLP” (E20, E21 and E27, data = 36)
Outputs “OLP”, which is a signal that turns ON during overload prevention control, in order to inform that the
overload prevention control has been activated and the output frequency has changed.
No effect can be expected in a system in which the load does not decrease even if the output frequency
decreases. Do not use this function.
Deceleration characteristic
Enable hard braking control with this function code.
During motor deceleration, if the regenerative energy returned exceeds the inverter’s braking capability, an
overvoltage trip occurs. When hard braking control is selected, the motor loss is increased and the deceleration
torque is increased during motor deceleration.
H71 data Function
0 Disable
1 Action
This function suppresses the torque during deceleration and is not effective if braking load is applied.
When anti
regenerative control of the torque limiter is enabled (H69 = 2, 4), the deceleration
characteristic is disabled.
Main power shutdown detection (Mode selection)
This function monitors the AC input power supply of the inverter to see if the AC input power supply (main circuit
power) is established and prevents inverter operation when the main circuit power is not established.
Available FRN0088E2-2/FRN0059E2-4 or above.
H72 data Function
0 Disables main circuit power cutoff detection
1 Enables main circuit power cutoff detection
With power supply via a PWM converter or DC link bus, there is no AC input. When the data for H72 is “1,” the
inverter cannot operate. Change the data for H72 to “0.”
For single-phase supply, consult your Fuji Electric representatives.
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