i.2 General Safety
20 YASKAWA ELECTRIC SIEP C710616 27C YASKAWA AC Drive A1000 Technical Manual
Drive Capacity
For specialized motors, make sure that the motor rated current is less than rated output current for the drive. When
running more than one motor in parallel from a single drive, the capacity of the drive should be larger than 1.1 times of
the total motor rated current.
Starting Torque
The overload rating for the drive determines the starting and accelerating characteristics of the motor. Expect lower
torque than when running from line power. To get more starting torque, use a larger drive or increase both the motor and
drive capacity.
Emergency Stop
When the drive faults out, the output is shut off. This, however, does not stop the motor immediately. Some type of
mechanical brake may be needed if it is necessary to halt the motor faster than the Fast Stop function is able to.
Options
The B1, B2, +1, +2, and +3 terminals are used to connect optional devices. Connect only A1000-compatible devices.
Repetitive Starting/Stopping
Cranes (hoists), elevators, punching presses, and other such applications with frequent starts and stops often exceed
150% of their rated current values. Heat stress generated from repetitive high current can shorten the life span of the
IGBTs.
Yaskawa recommends lowering the carrier frequency, particularly when audible noise is not a concern. The user can also
choose to reduce the load, increase the acceleration and deceleration times, or switch to a larger drive. This will help keep
peak current levels under 150%. Be sure to check the peak current levels when starting and stopping repeatedly during
the initial test run, and make adjustments accordingly.
For crane-type applications using an inching function in which the motor is quickly started and stopped, Yaskawa
recommends the following to ensure motor torque levels:
• Select a large enough drive so that peak current levels remain below 150% of the drive rated current.
• The drive should be one frame size larger than the motor.
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Installation
Enclosure Panels
Keep the drive in a clean environment by either selecting an area free of airborne dust, lint, and oil mist, or install the
drive in an enclosure panel. Be sure to leave the required space between drives to provide for cooling, and that proper
measures are taken so that the ambient temperature remains within allowable limits. Keep flammable materials away
from the drive. If the drive must be used in an area where it is subjected to oil mist and excessive vibration, protective
designs are available. Contact Yaskawa or your Yaskawa agent for details.
Installation Direction
The drive should be installed upright as specified in the manual. For more information on installation, Refer to
Mechanical Installation on page 40.
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Settings
Upper Limits
The drive is capable of running the motor up to 400 Hz. Due to the danger of accidentally of operating at high speed, be
sure to set the upper limit for the frequency. The default setting for the maximum output frequency is 50 Hz.
DC Injection Braking
Motor overheat can result if there is too much current used during DC Injection Braking, or if the time for DC Injection
Braking is too long.
Acceleration/Deceleration Times
Acceleration and deceleration times are affected by how much torque the motor generates, the load torque, and the inertia
moment. Set a longer accel/decel time when Stall Prevention is enabled. The accel/decel times are lengthened for as long
as the Stall Prevention function is operating. For faster acceleration and deceleration, install one of the braking options
available or increase the capacity of the drive.
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