If 0 V Is Detected When The Fan Is Started, Or The Fan Stalls; If Output Frequency Does Not Rise To Frequency Reference; Oscillation Occurs When Using Energy-Saving Control; An Ef (Forward/Reverse Run Commands Input Together) Was Detected - Omron SYSDRIVE 3G3RV Series User Manual

executed, it means that the DC injection braking is not decelerating enough. Adjust the DC injection braking
as follows:
• Increase the parameter b2-02 (DC Injection Braking Current) setting.
• Increase the parameter b2-04 (DC Injection Braking (initial excitation) Time at Stop) setting.
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If 0 V Is Detected When the Fan Is Started, or the Fan Stalls

Generation of 0 V (main circuit voltage) and stalling can occur if the fan is turning when it is started. The DC
injection braking is insufficient when starting.
This can be prevented by slowing fan rotation by DC injection braking before starting the fan. Increase the
parameter b2-03 (DC injection braking time (initial excitation) at start) setting.
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If Output Frequency Does Not Rise to Frequency Reference

Use the following information if the output frequency does not rise to the frequency reference.
nThe frequency reference is within the jump frequency range.
When the jump frequency function is used, the output frequency does not change within the jump frequency
range. Check to be sure that the Jump Frequency (parameters d3-01 to d3-03) and Jump Frequency Width
(parameter d3-04) settings are suitable.
nThe frequency reference upper limit has been reached.
The output frequency upper limit is determined by the following formula:
Maximum Output Frequency (E1-04) × Frequency Reference Upper Limit (d2-01) / 100
Check to be sure that the parameter E1-04 and d2-01 settings are suitable.
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Oscillation occurs when using energy-saving control

The energy-saving control setting may be incorrect. If oscillation occurs during energy-saving operation, mea-
sure the oscillation frequency. If the oscillation cycle matches b8-05 (power detection filter time constant), the
search operation will be adversely affected. Set b8-06 (search operation voltage limiter) to 0 to disable search
operation, or increase the power detection filter time constant.
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An EF (Forward/Reverse Run Commands Input Together) was detected

and the Inverter will not operate, or the motor operates for only an instant

when the control equipment power supply is turned OFF.

When the EF is detected and the Inverter will not operate, use one of the following measures.
nIncorrect Sequence
If the EF is detected when the forward reference and reverse reference are input simultaneously for 0.5 second
or more, revise the sequence.
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