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 shuts off but the motor does not stop immediately. A mechanical brake may be required
when it is necessary to stop the motor faster than the ability of the Fast Stop function of the drive.
Options
NOTICE: The B1, B2, +1, +2, and +3 terminals are used to connect optional A1000-compatible devices only. Connecting non-Yaskawa-
approved devices to these terminals may damage the drive.
Repetitive Starting/Stopping
Elevators, punching presses, and other 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. It may also be beneficial
to reduce the load, increase the acceleration and deceleration times, or switch to a larger drive to 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.
n
Installation
Enclosure Panels
Keep the drive in a clean environment by installing the drive in an enclosure panel or selecting an installation area free of
airborne dust, lint, and oil mist. Be sure to leave the required space between drives to provide for cooling, and take proper
measures so the ambient temperature remains within allowable limits and keep flammable materials away from the drive.
Yaskawa offers protective designs for drives that must be used in areas subjected to oil mist and excessive vibration. Contact
Yaskawa or your Yaskawa agent for details.
Installation Direction
NOTICE: Install the drive upright as specified in the manual. Refer to Mechanical Installation on page 40 for more information on
installation. Failure to comply may damage the drive due to improper cooling.
n
Settings
Motor Code
When using OLV/PM, set the proper motor code to parameter E5-01 before performing a trial run.
Upper Limits
NOTICE: The drive is capable of running the motor up to 400 Hz. Be sure to set the upper limit for the frequency of the drive to prevent the
possible danger of accidentally operating equipment at higher than rated speed. The default setting for the maximum output frequency is
60 Hz.
DC Injection Braking
NOTICE: Excessive current during DC Injection Braking and excessive duration of DC Injection Braking can cause motor overheat.
Acceleration/Deceleration Times
Acceleration and deceleration times are affected by the amount of torque generated by the motor, 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 in operation. Install one of the available braking options or increase the capacity of the
drive for faster acceleration and deceleration.
n
General Handling
Wiring Check
NOTICE: Do not connect power supply lines to output terminals U/T1, V/T2, or W/T3. Failure to comply will destroy the drive. Be sure to
perform a final check of all sequence wiring and other connections before turning on the power and also check for short circuits on the
control terminals, which may damage the drive.
Selecting a Circuit Breaker or Leakage Circuit Breaker
Yaskawa recommends installing a Ground Fault Circuit Interrupter (GFCI) to the power supply side. The GFCI should be
designed for use with AC drives (e.g., Type B according to IEC 60755).
Select a Molded Case Circuit Breaker (MCCB) or GFCI with a rated current 1.5 to 2 times higher than the drive rated current
to avoid nuisance trips caused by harmonics in the drive input current. Refer to Installing a Molded Case Circuit Breaker
(MCCB) and Earth Leakage Circuit Breaker (ELCB) on page 367 for more information.
i.2 General Safety
YASKAWA ELECTRIC SIEP C710616 31B YASKAWA AC Drive – A1000 Technical Manual
21
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