Yaskawa V74X Drives User Manual
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Interconnection Precautions
and Diagrams
Section 7
7.
An optional DC reactor may be added for harmonic attenuation, if needed. See separate instruction sheet for wiring.
8.
If application does not allow reverse operation, parameter n006, Reverse Run Prohibit Selection, should be set to
“ 1 ” (Reverse Run Disabled), and the Reverse Run/Stop input can be eliminated.
9.
Input fuses are required for proper branch circuit short circuit protection for all NEMA Type 4 drives. Failure
to use recommended fuses (see appendix 4) may result in damage to the drive and/or personal injury.
The Drive leaves the factory with parameters initialized for 2-Wire control (when using external Run/Stop
signals). Before using the initialization function of constant n001, know your control wiring configuration:
10 = Factory 2-Wire Control Initialization (Maintained RUN Contact)
11 = Factory 3-Wire Control Initialization (Momentary START/STOP Contact)
Entering either Initialization code resets all parameters to factory settings, and automatically returns parameter
n001 setting to “ 1 ”. If the Drive is connected for 3-Wire control and this parameter is set to “ 10 ” (2-Wire
Control Initialization), the motor may run in reverse direction WITHOUT A RUN COMMAND APPLIED.
Equipment damage or personal injury may result.
Parameter n012 must be set to proper motor voltage.
Always ground the Drive using the ground terminal provided.
Never connect main circuit output terminals T1 (U), T2 (V) & T3 (W) to AC main circuit power supply.
When programmed for auto-restart ( n082 = “ 1 ” thru “ 10 ”), the motor may restart unexpectedly — personal
injury may result.
For Enclosed wall-mounted type (NEMA type 1)
When mounting units in an enclosure, remove the top, bottom and terminal covers. Install a cooling fan or some
other means to maintain the air entering the enclosure below 113°F (45°C).
CAUTION
WARNING
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