Data for H69
Function
0
Disable
1
Enable (Lengthen the deceleration time to three times the specified time
under voltage limiting control.)
4
Enable (Torque limit control: Disable force-to-stop processing.)
Enabling the anti-regenerative control may automatically increase the deceleration
time.
When a braking resistor is connected, disable the anti-regenerative control.
H70
Automatic Overload Prevention Control
H70 specifies the decelerating rate of the output frequency to prevent a trip from occurring due to
an overload. This control decreases the output frequency of the inverter before the inverter trips
due to a heat sink overheat or inverter overload (with an alarm indication of OH1 or OLU ,
respectively). It is useful for equipment such as pumps where a decrease in the output frequency
leads to a decrease in the load and it is necessary to keep the motor running even when the output
frequency drops.
Data for H70
Function
0.00
Decelerate the motor by deceleration time 1 (F08) or 2 (E11)
0.01 to 100.00
Decelerate the motor by deceleration rate from 0.01 to 100.00 (Hz/s)
999
Disable overload prevention control
In equipment where a decrease in the output frequency does not lead to a decrease
in the load, the overload prevention control is of no use and should not be enabled.
H71
Deceleration Characteristics
Setting the H71 data to "1" (ON) enables forced brake control. If regenerative energy produced
during deceleration of the motor and returned to the inverter exceeds the inverter’s braking
capability, an overvoltage trip will occur. The forced brake control increases the motor energy loss
during deceleration, increasing the deceleration torque.
This function is aimed at controlling the torque during deceleration; it has no effect if
there is braking load.
Enabling the automatic deceleration (anti-regenerative control, H69 = 2 or 4)
disables the deceleration characteristics specified by H71.
5-66
