5.3 Description of Function Codes 5.3.5 H codes (High performance functions)
Anti-regenerative control (Operation selection)
Anti-regenerative control (Operation level)
Related function codes: H76 (Torque limiter) (Frequency rising limit for braking)
Enable the automatic deceleration (anti-regenerative control) with this function code. 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. Turning digital input “AR-CCL” ON cancels anti-regenerative control.
If anti-regenerative control is selected, the output frequency is controlled to suppress the regenerative energy for
avoiding an overvoltage trip.
Force-to-stop with actual deceleration time
exceeding 3 times the specified one
Disable anti-regenerative control
DC link bus voltage control
DC link bus voltage control
Disable anti-regenerative control
FRENIC-MEGA is equipped with two control modes: torque limiter and DC link bus voltage control.
Understand the features of the respective modes and select the appropriate one.
Torque limiter
(H69 = 2, 4)
Controls the output frequency
so that the braking torque is
approximately 0.
Enabled during
acceleration,
constant speed
operation and
deceleration.
Features high response and
makes less prone to overvoltage
trips under impact load.
The frequency operation amount
can be adjusted with H114.
DC link bus
voltage control
(H69 = 3, 5)
Controls the output frequency
so that the DC link bus
voltage is decreased when it
exceeds the limit level.
Enabled only during
deceleration
Disabled during
constant speed
operation
Regenerative capability of the
inverter will be maximum use.
Deceleration time will be shorter
than the torque limit control.
Select droop “AR-CCL” (Function codes E01 to E09, data = 82)
Anti-regenerative control can be canceled with “AR-CCL”. When “AR-CCL” is ON, the H69 setting is ignored, and
anti-regenerative control is disabled.
Torque limiter (Frequency rising limit for braking) (H76)
• Data setting range: 0.0 to 599.0 (Hz)
With the torque limiter, the inverter increases the output frequency to limit the output torque. Excessive increase of
the output frequency may cause danger, and therefore the frequency increment limit for braking (H76) is provided.
This prevents the output frequency from increasing to exceed the “reference frequency + H76.” If the limit is reached,
however, anti-regenerative control is restricted and an overvoltage trip may occur. Increasing the frequency
increment limit for braking improves the anti-regenerative capability.
This function is disabled under vector control. Under vector control, torque commands are restricted. The output
frequency is determined by the speed at the load side.
If a run command is turned OFF, the anti-regenerative control causes the frequency to increase and operation may
not stop depending on the load conditions. For safety, a function is provided in which the anti-regenerative control
is forced to be disabled if the actual deceleration time becomes three times the deceleration time currently selected
forcing the operation to stop. The function can be enabled/disabled by the setting of H69.
To Next Page
Loading...
