Output Frequency Does Not Reach Frequency Reference; Inverter Does Not Run Because Ef (Simultaneous Input Of Forward And Reverse Commands) - Omron SYSDRIVE 3G3JV User Manual

Maintenance Operations

8-2-12 Output Frequency Does Not Reach Frequency Reference

• The frequency reference is within the jump frequency range.
If the jump function is used, the output frequency stays within the jump frequency range.
Make sure that the jump width settings in n49 through n50 for jump frequencies 1 and 2 and jump
width in n51 are appropriate.
• The preset output frequency exceeds the upper-limit frequency.
The upper-limit frequency can be obtained from the following formula.
Maximum frequency in n09 × frequency reference upper limit in n30/100
Make sure that the parameters in n09 and n30 are correct.
8-2-13 Inverter Does Not Run Because EF (Simultaneous Input
of Forward and Reverse Commands) is Detected, or
Motor Rotates Momentarily While Control Device Power
is OFF
• Sequence Error
An EF will be detected if a forward command and a reverse command are input simultaneously for
0.5 seconds or longer. Correct the sequence.
• Malfunction Due to Unwanted Current Path
Inverter inputs may remain ON due to an unwanted current path for the controller outputs. With the
wiring shown in the following table, if the controller output power supply is less than 24 V DC or if the
power is OFF, the current indicated by the arrow will flow and the Inverter inputs will operate. If that
occurs, insert a diode as shown in the diagram at point A.
Controller (Output unit)
Section A
S1 to S5
Inverter (Control input)
SC
GND
Chapter 8
8-15