YASKAWA A1000 Series Quick Start Manual page 11

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. The expected lifesaving for the IGBTs is about 8 million start and stop cycles with a 4 kHz carrier frequency and
a 150% peak current.
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.
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,
Mechanical Installation on page
Settings
Motor Code
If using OLV/PM designed for permanent magnet motors, make sure that the proper motor code has been set to
parameter E5-01 before performing a trial run.
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 60 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.
Compliance with Harmonic Suppression Guidelines
A1000 conforms to strict guidelines in Japan covering harmonic suppression for power conversion devices. Defined in
JEM-TR201 and JEM-TR226 and published by the Japan Electrical Manufacturers' Association, these guidelines define
the amount of harmonic current output acceptable for new installation. Instructions on calculation harmonic output are
available at www.e-mechatronics.com.
General Handling
Wiring Check
Never connect the power supply lines to output terminals U/T1, V/T2, or W/T3. Doing so will destroy the drive. Be sure
to perform a final check of all sequence wiring and other connections before turning the power on. Make sure there are
no short circuits on the control terminals (+V, AC, etc.), as this could damage the drive.
YASKAWA ELECTRIC TOEP C710616 21C YASKAWA AC Drive - A1000 Quick Start Guide
19.
i Preface & General Safety
Refer to
11