Fuji Electric frenic mini series - Page 246

9.2 Details of Function Codes
9-61
Chap. 9 FUNCTION CODES

H70 Overload Prevention Control (Frequency drop rate)

Enables overload suppressing control. If enabled, this function code is used to set the
deceleration (Hz/s).
Before the inverter enters Alarm mode due to heat sink overheat or overload (alarm code:
J
or
NW
), this control decreases the output frequency of the inverter to suppress the trip.
Data for H70 Function
0.00 Decelerate by deceleration time 1 (F08) or 2 (E11).
0.01 to 100.0 Decelerate by 0.01 to 100.0 Hz/sec.
999 Disable overload suppression control

- When overload suppressing control is enabled, the inverter decelerates the motor according
to the set deceleration rate if the temperature anywhere inside the inverter exceeds the alarm
detection level.
- Apply this control to equipment (such as pumps) whose drive frequency drops in line with
any decrease in load. If you want to proceed to drive such kind of equipment even the inverter
slows down the output frequency, enable this control.
• Do not use this function to equipment whose load does not slow if the inverter
output frequency drops, as it will have no effect.
• To avoid any conflict between overload suppressing control and any other
frequency lowering features, this control does not function if the features to limit
the output current are enabled (F43 z 0 and H12 = 1). To force this control to
enabled status, set 0 for function codes F43 and H12.

H80 Gain for Suppression of Output Current Fluctuation

The inverter output current driving the motor may fluctuate due to the motor characteristics
and/or backlash in the load mechanism. Modify the data in function code H80 to adjust the
amount in order to suppress such fluctuation. However, as incorrect setting of this amount may
cause a much larger current fluctuation, do not modify the default setting unless it is necessary.
- Data setting range: 0.00 to 0.20

H89 Motor overload memory retention

This is Motor overload memory (Electrical thermal O/L relay) retention selection at power up.
Data for H89 Function
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.

H95 DC Braking (Braking mode) Refer to F21.
For details of setting the braking mode, refer to the descriptions of function code F21.
