Specifications
94
MMMMNotes
Application of Inverter
■ Setting
Reactor
■ Inverter
Capacity
■Initial Torque
■ Emergency
Stop
■ Options
■ Installation in
Enclosures
■ Installation
Direction
■ Upper Limits
■ DC Injection
Braking
■ Accel/Decel
Times
■ Wiring Check
■
Magnetic Contactor
Installation
■
Maintenance
and Inspections
■Wiring
■ Others
Use a DC reactor or AC reactor (option) on the inverter
input side when the inverter is connected directly to a large-
capacity power transformer (600 kVA and more within 10 m
distance) or when a power factor improvement capacitor is
switched. Otherwise excess peak current may occur in the
power feed circuit and the converter section may be
damaged. DC reactor is built in 18.5 to 110 kW, 200 V class
inverters and 18.5 to 300 kW, 400 V class inverters. An AC
reactor is also required when a thyristor converter such as
a DC drive is connected to the same power system.
Make sure that the motor
,
s rated current is less than the drive
,
s output current. When running a
specialized motor or 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.
The starting and accelerating characteristics of the motor driven by an inverter are restricted by the
overload current ratings of the inverter. Compared to running with commercial power supply, lower
torque output should be expected. If high starting torque is required, use an inverter of higher capacity
or increase the capacities of both the motor and the inverter.
When an error occurs, a protective circuit is activated and the inverter output is turned OFF. However,
the motor cannot be stopped immediately. Use a mechanical brake and hold the equipment for a fast
stop if necessary.
Terminals B1, B2,
F, G 1, G 2, G 3 are for YASKAWA options. Do not connect equipment other than
YASKAWA options.
Avoid oil mist or dust. Place the inverter in a clean area or house it in a totally-enclosed case so that no
contamination enters. To use the totally-enclosed case, select the cooling method and panel dimensions
so the inverter ambient temperature will be within the allowable range.
Do not install the inverter on flammable material, such as wood.
Install the inverter on a wall with the longer side in the vertical position.
The inverter can be driven at an output frequency of up to 400 Hz with the digital operator. Setting errors
may create a dangerous situation. Set the upper limit with the upper limit frequency setting function.
(Maximum output frequency in external input signal operation is preset to 60 Hz at the factory.)
Large DC injection braking operating currents and times may cause motor overheating.
Motor accel/decel time is determined by the motor generating torque, load torque, and load inertia
GD
2
/4. If the stall prevention function is activated during accel/decel, set the accel/decel time longer.
After the stall prevention function is activated, the accel/decel time is extended to a length that the
inverter can handle. To shorten the accel/decel time, increase the capacity of the inverter and possibly
the motor.
Applying power to inverter output terminals U/T1, V/T2, or W/T3 will damage the inverter. DOUBLE
CHECK WIRING AND SEQUENCE BEFORE TURNING THE POWER ON.
If magnetic contactor (MC) is used on the primary side of the inverter, do not use the MC for starting
and stopping the inverter frequently. Otherwise, the inverter life may be reduced.
After turning power to the inverter OFF, electric charges in the internal capacitors are retained
temporarily. Wait until the charge LED goes off before touching the inside of the inverter.
Use round pressure terminal when wiring UL and C-UL listed inverters. Caulking should be done by the
caulking tools specified by terminal manufactures.
Do not subject the inverter to halogen gases, such as fiuorine, chlovine, bromine, and iodine, at any time
even during transportation or installation.
4000
600
0
60 400
Inverter Capacity (kVA)
Power Supply
（kVA）
DC or AC reactor
required
DC or AC reactor
not required
Selection
Installation
Setting
Operation