Yaskawa G5HHP Drive - Manual (Page 350)

Appendix
12.1.3 Handling
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12.1 Inverter Application Precautions
12.1.1 Selection
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Inverter Capacity
When connecting special motors or multiple motors in parallel to an Inverter, select the Inverter capacity so
that the rated output current of the Inverter is 1.1 times the sum of all the motor rated currents.
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Initial Torque
The startup and acceleration characteristics of the motor are restricted by the overload current ratings of the
Inverter that is driving the motor. The torque characteristics are generally less than those required when starting
using a normal commercial power supply. If a large initial torque is required, select an Inverter with a somewhat
larger capacity or increase the capacity of both the motor and the inverter.
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Emergency Stop
Although the Inverter’s protective functions will stop operation when a fault occurs, the motor will not stop
immediately. Always provide mechanical stop and protection mechanisms on equipment requiring an emer-
gency stop.
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Options
Terminals © and ¨1 are for connecting only the options specifically provided by Yaskawa. Never connect
any other devices to these terminals.
12.1.2 Settings
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Upper Limits
The Digital Operator can be used to set high-speed operation up to a maximum of 150 Hz. Incorrect settings
can be dangerous. Use the maximum frequency setting functions to set upper limits. (The maximum output
frequency is factory-set to 60 Hz.)
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DC Injection Braking
The motor can overheat if the DC injection braking voltage or braking time is set to a large value.
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Acceleration/Deceleration Times
The motor’s acceleration and deceleration times are determined by the torque generated by the motor, the load
torque, and the load’s inertial moment (GD 2 /4). If the stall prevention functions are activated during accelera-
tion or deceleration, increase the acceleration or deceleration time. The stall prevention functions will increase
the acceleration or deceleration time by the amount of time the stall prevention function is active.
To reduce the acceleration or deceleration times, increase the capacity of the motor and Inverter.
12.1.3 Handling
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Wiring Check
The Inverter will be internally damaged if the power supply voltage is applied to output terminal U, V, or W.
Check wring for any mistakes before supplying power. Check all wiring and sequences carefully.
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Inspections
The internal capacitors in the Inverter require time to discharge after the power supply is turned OFF. Do not
start inspections until the CHARGE indicator goes out.
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