Fuji Electric FRENIC-AQUA series, User Manual

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H63 Low Limiter (Mode selection) (
Refer to F15.)
For details, refer to the description of F15.
H64 Low Limiter (Lower limiting frequency)
H64 specifies the lower limit of frequency to be applied when the current limiter, torque
limiter, automatic deceleration (anti-regenerative control), or overload prevention control is
activated. Normally, it is not necessary to change this data.
- Data setting range: 0.0 to 60.0 (Hz)
H68 Slip Compensation 1 (Operating conditions) (
Refer to F42.)
For details, refer to the description of F42.
H69 Automatic Deceleration (Mode selection)
H76 (Torque Limiter for Braking, Frequency increment limit)
H69 toggles anti-regenerative control on and off.
In the inverter not equipped with a PWM converter or braking unit, if the regenerative energy
returned exceeds the inverter's braking capability, an overvoltage trip occurs.
To avoid such an overvoltage trip, enable the automatic deceleration (anti-regenerative
control) with this function code, and the inverter controls the output frequency to keep the
braking torque around 0 N·m in both the acceleration/deceleration and constant speed
running phases.
The FRENIC-AQUA series of inverters have two braking control modes; torque limit control
and DC link bus voltage control. Understand the feature of each control and select the suitable
one.
Control mode Control process Operation mode Features
Torque limit
control
(H69=2 or 4)
Output frequency is
controlled so that the
braking torque is kept
at the regeneration
avoidance operation
level (H114).
Enabled during
acceleration, running
at the constant speed,
and deceleration.
Quick response.
Causes less
overvoltage trip with
heavy impact load.
DC link bus
voltage control
(H69=3 or 5)
Control the output
frequency to lower
the DC link bus
voltage if the voltage
exceeds the limiting
level.
Enabled during
deceleration.
Disabled during
running at the
constant speed.
Shorter deceleration
time by making good
use of the inverter's
regenerative
capability.