Yaskawa i80M Connecting Manual - Manual (Page 315)

A6. PRECAUTIONS FOR APPLICATION
A6. 1 MINUS LOAD
The motor is rotated by the load; it is impossible to apply brake (regenerative brake) against
this rotation and achieve continuous running.
Example Driving a motor to lower objects (with no counterweight)
Since Servopack has the regenerative brake capability of short time (corresponding to the
motor stopping time), for application to a minus load, contact Yaskawa representative.
A6. 2 LOAD INERTIA (GD 2 )
The allowable load inertia GD 2 converted to the motor shaft must be within five times the rotor
inertia (J
M
) of the applicable AC If the allowable load inertia (J
L
) is exceeded, an
overvoltage alarm may be given during deceleration. If this occurs, take the following actions:
●
Reduce the current limit.
●
Slow down the deceleration curve.
●
Decrease the maximum speed.
For details, contact Yaskawa representative.
A6. 3 HIGH VOLTAGE LINE
If the supply voltage is 400/440VAC, the voltage must be dropped three-phase, 400/440VAC to
200VAC by using a power transformer. Table A7. 2 shows the transformer selection. Connec-
tion should be made so that the power is supplied and cut through the primary side of the trans-
former. Single-phase 100VAC class power supply should not be used.
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