i.2 General Safety
22 YASKAWA ELECTRIC SIEP C710636 02B YASKAWA U1000 Technical Manual
Selection of Power Supply Capacity
Use a power supply that is greater than the rated input capacity (kVA) of the drive. If the power supply is lower than the
rated capacity of the drive, the device will be unable to run the application properly and will trigger a fault.
The rated input capacity of the drive, S
CONV
(kVA), can be calculated by the following formula:
S
CONV
= × I
in
× V
in
/1000
(I
in
: Rated input current [A], V
in
: Applicable power supply voltage [V])
Connection to Power Supply
The total impedance of the power supply and wiring for the rated current of the drive is %Z = 10% or more. Power
voltage distortion may occur when the impedance of the power supply is too large. When wiring over long distances, be
sure to take preventative measures such as using thick cables or series wiring to lower the impedance of wiring. Contact
Yaskawa for details.
Grounding the Power Supply
Yaskawa recommends using a dedicated ground for the power supply, as the drive is designed to run with a 1:1 ratio
relative to the power supply. Ground other devices should as directed in the specifications for those devices. Take
particular care when connecting sensitive electronic equipment such as OA devices. Separate ground lines and install a
noise filter to prevent problems from noise.
When Using a Generator as a Power Supply
Select the generator capacity approximately twice as large as the drive input power supply capacity. Set the deceleration
time or load so that the regenerative power from the motor will be 10% or less of the generator capacity. For further
information, contact a Yaskawa representative.
When a Phase Advance Capacitor or Thyristor Controller is Provided for the Power Supply
The drive does not require a phase advance capacitor. Installing a phase advance capacitor to the drive will weaken the
power factor.
For the phase advance capacitor that has already been installed on the same power supply system as the drive, attach a
phase-advance capacitor with a series reactor to prevent oscillation with the drive.
Contact Yaskawa when a device generating voltage surge or voltage distortion such as DC motor drive thyristor
controller or magnetic agitator is installed on the same power supply system.
Prevention Against EMC or Harmonic Leakage Current
Use units with built-in EMC filters that have the CE marking.
Be sure to use a stand-alone EMC filter for models CIMR-U40477 to 40930.
Use a zero-phase reactor as a noise filter when a device that will be affected by noise is near the drive.
Effects of Power Supply Distortion
Distortion of the power supply voltage increases the harmonics contents due to power supply harmonics entering the
drive.
Starting Torque
The startup and acceleration characteristics of the motor are restricted to the drive’s overload current rating (HD: 150%
60 s, ND: 120% 60 s).
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 achieve a higher starting torque, use a larger drive, or a drive and motor
with larger capacity.
Output Short Circuit
In an elevator with a synchronous motor, the three-phase motor line can be short-circuited to generate a holding force for
the motor while stopping, and to generate a large braking force during power loss or emergency stop. In this case, select
the appropriate motors and perform an interlock. Failure to comply could cause damage the drive and motor or
mechanical shock. Contact Yaskawa or your nearest sales representative for details.
SIEP_C710636_02B_1_0.book 22 ページ ２０１５年１１月２５日 水曜日 午後４時５６分
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