Yaskawa Matrix Converter - Manual (Page 341)

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The operation method selection is wrong.
If parameter b1-02 (Run Command Selection) is set to 0 (Digital Operator), the motor will not operate when
an external operation signal is input. Set b1-02 to 1 (control circuit terminal) and try again.
Similarly, the motor will also not operate if the LOCAL/REMOTE key has been pressed to switch to digital
operator operation. In that case press the LOCAL/REMOTE key again to return to the original setting.
A 3-wire sequence is in effect.
The input method for a 3-wire sequence is different than when operating by forward/stop and reverse/stop (2-
wire sequence). When 3-wire sequence is set, the motor will not operate even when an input terminal suitable
for forward run/stop and reverse run/stop is turned on.
When using a 3-wire sequence, refer to the timing chart and input the proper signals.
When using a 2-wire sequence, set the multi-function input terminal (H1-01 through H1-10, terminals S3 to
S11) to a value other than 0.
The frequency reference is too low.
If the frequency reference is set below the frequency set in E1-09 (Minimum Output Frequency), the MxC will
not operate. Raise the frequency reference to at least the minimum output frequency.
There is a multi-function analog input setting error.
If multi-function analog inputs H3-05 (Terminal A3 Function Selection) and H3-09 (Terminal A2 Function
Selection) are set to 1 (frequency gain), and if no voltage (current) is input, then the frequency reference will
be zero. Check to be sure that the set value and analog input value are correct.
„ The motor stops during acceleration or when a load is connected.
The load may be too heavy. The MxC has a stall prevention function and an automatic torque boost function,
but the motor responsiveness limit may be exceeded if acceleration is too rapid or if the load is too heavy.
Lengthen the acceleration time or reduce the load. Also consider increasing the motor capacity.
„ The motor does not accelerate.
If the torque limit settings (L7-01 to L7-04) or the torque reference input (torque control) are too small, the
motor may not be able to accelerate. Check the settings and input values.
„ The motor only rotates in one direction.
“Reverse run prohibited” is selected. If b1-04 (Reverse Operation Selection) is set to 1 (reverse run prohib-
ited), the MxC will not receive Reverse Run Commands. To use both forward and reverse operation, set b1-04
to 0.
INFO
The LOCAL/REMOTE key is enabled by setting o2-01 to 1 and disabled by setting o2-01 to 2. It is enabled
when the digital operator is in the Drive Mode.