5-67
H45
H97
Mock Alarm
Clear Alarm Data
H45 causes the inverter to generate a mock alarm in order to check whether external
sequences function correctly at the time of machine setup.
Setting the H45 data to "1" displays mock alarm
GTT
on the LED monitor and issues alarm
output ALM to the digital output terminal specified (see E20, E21 and E27). (Accessing the
H45 data requires simultaneous keying of "
key + key.") After that, the H45 data
automatically reverts to "0," allowing you to reset the alarm.
Just as for data (alarm history and relevant information) of those alarms that could occur in
running of the inverter, the inverter saves mock alarm data, enabling you to confirm the mock
alarm status.
To clear the mock alarm data, use H97. (Accessing the H97 data requires simultaneous
keying of "
key + key.") For details, refer to the description of H97.
H69
H76
Automatic Deceleration (Anti-regenerative control) (Mode selection)
Torque Limiter (Frequency increment limit for braking)
H69 enables or disables the anti-regenerative control.
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 Nm in both the acceleration/deceleration and constant speed running
phases.
Since increasing the output frequency too much in the anti-regenerative control is dangerous,
the inverter has a torque limiter (Frequency increment limit for braking) that can be specified
by H76. The torque limiter limits the inverter's output frequency to less than "Reference
frequency + H76 setting."
Note that the torque limiter activated restrains the anti-regenerative control, resulting in a trip
with an overvoltage alarm in some cases. Increasing the H76 data (0.0 to 400.0 Hz) makes
the anti-regenerative control capability high.
In addition, during deceleration triggered by turning the run command OFF, the
anti-regenerative control increases the output frequency so that the inverter may not stop the
load depending on the load state (huge moment of inertia, for example). To avoid that, H69
provides a choice of cancellation of the anti-regenerative control to apply when three times
the specified deceleration time is elapsed, thus decelerating the motor.
Data for H69 Function
0 Disable
2
Enable
(Canceled if actual deceleration time exceeds three times the one specified by
F08/E11.)
4
Enable
(Not canceled even if actual deceleration time exceeds three times the one
specified by F08/E11.)
Enabling the anti-regenerative control may automatically increase the deceleration
time.
When a braking unit is connected, disable the anti-regenerative control.
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