YASKAWA L1000V Technical Manual page 18

i.2 General Safety
Mechanical Brake
When the drive faults out, the output shuts off but the motor does not stop when elevator is in unbalanced weight
condition. A mechanical brake is required.
Repetitive Starting/Stopping
Elevators and other applications with frequent starts and stops often approach 150% of their rated current values. Heat
stress generated from repetitive high current will shorten the life span of the IGBTs. The expected lifetime for the IGBTs
is about 3 million start and stop cycles with a 8 kHz carrier frequency and 165% peak current.
Yaskawa recommends lowering the carrier frequency, particularly when audible noise is not a concern. It is beneficial to
reduce the load, increase the acceleration and deceleration times, or switch to a larger drive to help keep peak current
levels under 165%. Be sure to check the peak current levels when starting and stopping repeatedly during the initial test
run, and make adjustments accordingly.
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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 supplier for details.
Installation Direction
NOTICE: Install the drive upright as specified in the manual.
installation. Failure to comply may damage the drive due to improper cooling.
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Settings
DC Injection Braking
NOTICE: Excessive current during DC Injection Braking and excessive duration of DC Injection Braking can cause motor overheat.
Acceleration/Deceleration Ramp
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.
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General Handling
Selecting a Molded Case Circuit Breaker or RCD/RCM Devices
Where an RCD (residual current device) or RCM (residual current monitor) at the drive power supply side is used for
protection in case of direct or indirect contact, only an RCD or RCM of type B according to IEC 60755 is allowed.
Select a MCCB (Molded Case Circuit Breaker) or RCD/RCM with a rated current that is 1.5 to 2 times higher than the
rated current of the drive in order to avoid nuisance trips caused by harmonics in the drive input current. Also refer to
Installing a Molded Case Circuit Breaker (MCCB) on page
WARNING! Sudden Movement Hazard. Install a properly controlled contactor on the input-side of the drive for applications where
power should be removed from the drive during a fault condition. Improper equipment sequencing could result in death or serious
injury.
WARNING! Fire Hazard. Shut off the drive with a magnetic contactor (MC) when a fault occurs in any external equipment such as
braking resistors. Refer to Installing a Magnetic Contactor at the Power Supply Side on page
resistor overheating, fire, and injury to personnel.
To get the full performance life out of the electrolytic capacitors and circuit relays, refrain from switching the drive
power supply off and on more than once every 30 minutes. Frequent use can damage the drive. Use the drive to stop and
start the motor.
Inspection and Maintenance
WARNING! Electrical Shock Hazard. Capacitors in the drive do not immediately discharge after shutting off the power. Wait for at
least the amount of time specified on the drive before touching any components after shutting off the power. Failure to comply may
cause injury to personnel from electrical shock.
18
Refer to Mechanical Installation on page 31
208.
YASKAWA EUROPE SIEP
for more information on
210. Failure to comply may cause
YASKAWA AC Drive L1000V Technical Manual