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H70 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
J
or
NW
, 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 selected deceleration time
0.01 to 100.0 Decelerate the motor by deceleration rate from 0.01 to 100.0 (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 the 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 i
there is braking load.
Enabling the automatic deceleration (anti-regenerative control, H69 = 2 or 4)
disables the deceleration characteristics specified by H71.
H89 Motor overload memory retention
This is Motor overload memory (Electrical thermal O/L relay) retention selection at
power up.
0
Inactive
When power up the drive, Motor overload data is reset.
1
Active
When power is down, the drive stores Motor overload data and
use this data at next power up.
H94 Cumulative Motor Run Time 1
Operating the keypad can display the cumulative run time of motor 1. This feature is useful for
management and maintenance of the mechanical system. H94 allows you to set the
cumulative run time of the motor to the desired value. For example, specifying "0" clears the
cumulative run time of the motor.
The H94 data is in hexadecimal notation. It appears in decimal notation on the
keypad.
H98 Protection/Maintenance Function (Mode selection)
H98 specifies whether to enable or disable (a) automatic lowering of carrier frequency, (b)
H89 set to:
To do this
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