Brochure

27
Installation of an AC reactor
on the input side
In the following examples involving a general-purpose inverter, a large peak current ows on the main power supply side, and is able to destroy
the converter module. Where such situations are foreseen or the connected equipment must be highly reliable, install an AC reactor between the
power supply and the inverter. Also, where inuence of indirect lightning strike is possible, install a lightning conductor.
(A) The unbalance factor of the power supply is 3% or higher. (Note)
(B) The power supply capacity is at least 10 times greater than the inverter capacity (the power supply capacity is 500 kVA or more).
(C) Abrupt power supply changes are expected.
Examples: (1) Several inverters are interconnected with a short bus.
(2) A thyristor converter and an inverter are interconnected with a short bus.
(3) An installed phase advance capacitor opens and closes.
In cases (A), (B) and (C), it is recommended to install an AC reactor on the main power supply side.
Note: Example calculation with VRS = 205V, VST = 201V, VTR = 200V (VRS : R-S line voltage, VST : S-T line voltage, VTR : T-R line voltage)
Unbalance factor of voltage = X 100
= X 100 = X 100 = 1.5 (%)
Using a private power generator
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(1) High-frequency components are included in the input / output of the inverter main circuit, and they may cause interference in a transmitter, radio, or sensor if used near the inverter.
The interference can be minimized by attaching noise lters (option) in the inverter circuitry.
(2) The switching action of an inverter causes an increase in leakage current. Be sure to ground the inverter and the motor.
Wiring connections
(1) Be sure to connect main power wires with R (L1), S (L2), and T (L3) terminals (input) and motor wires to U (T1), V (T2), and W (T3) terminals (output).
(Incorrect connection will cause an immediate failure.)
(2) Be sure to provide a grounding connection with the ground terminal (
).
Wiring between
inverter and
motor
Electro-magnetic
contactor
When an electromagnetic contactor is installed between the inverter and the motor, do not perform on-off switching during running operation.
Thermal relay
When used with standard applicable output motors (standard three-phase squirrel-cage four-pole motors), the WJ200 Series does not need a
thermal relay for motor protection due to the internal electronic protective circuit. A thermal relay, however, should be used:
• during continuous running outside a range of 30 to 60 Hz.
• for motors exceeding the range of electronic thermal adjustment (rated current).
• when several motors are driven by the same inverter; install a thermal relay for each motor.
• The RC value of the thermal relay should be more than 1.1 times the rated current of the motor. Where the wiring length is 10 m or more, the
thermal relay tends to turn off readily. In this case, provide an AC reactor on the output side or use a current sensor.
Installing a circuit breaker
Install a circuit breaker on the main power input side to protect inverter wiring and ensure personal safety. Choose an inverter-compatible circuit breaker.
The conventional type may malfunction due to harmonics from the inverter. For more information, consult the circuit breaker manufacturer.
Wiring distance
The wiring distance between the inverter and the remote operator panel should be 20 meters or less. Shielded cable should be used on the wiring.
Beware of voltage drops on main circuit wires. (A large voltage drop reduces torque.)
Earth leakage relay If the earth leakage relay (or earth leakage breaker) is used, it should have a sensitivity level of 15 mA or more (per inverter).
Phase advance capacitor
Do not use a capacitor for power factor improvement between the inverter and the motor because the high-frequency components of the inverter
output may overheat or damage the capacitor.
Max. line voltage (min.) – Mean line voltage
Mean line voltage
Because a DC bus capacitor deteriorates as it undergoes internal chemical reaction, it should normally be replaced every 10 years. (10 years is not the
guaranteed lifespan but rather, the expected design lifeplan.) Be aware, however, that its life expectancy is considerably shorter when the inverter is
subjected to such adverse factors as high temperatures or heavy loads exceeding the rated current of the inverter.
JEMA standard is the 5 years at ambient temperature 40
º
C used in 12 hours daily. (according to the “Instructions for Periodic Inspection of General-
Purpose Inverter” (JEMA))
Also, such moving parts as a cooling fan should be replaced. Maintenance inspection and parts replacement must be performed by only specied trained personnel.
Please plan to replace new INV depends on the load, ambient condition in advance.
VRS− (VRS + VST + VTR)/3
(VRS + VST + VTR)/3
205− 202
202
[Main power supply]
Notes on Peripheral Equipment Selection
High-frequency Noise and Leakage Current
Lifetime of Primary Parts
50
40
30
Ambient temperature (º
C
)
2.5 5 10
Capacitor lifetime (years)
Information in this brochure is subject to change without notice.
For Correct Operation
[About the use in highlands beyond l,000m above sea level]
When the standard inverter is used at a place beyond l,000m above sea level because it cool heating element with air, please be careful as follows, But please inquire for the highlands more
than 2,500m separately.
1 . Reduction of the inverter rating current
The density of air decreases by 1% whenever rising by 100m when the altitude exceeds 1,000m. For example, in the case of 2,000m above sea level, it is {2,000(m)- because it becomes
1,000(m)}/100(m)X{-1(%)}=-10(%), please use with 10(%) reduction (0.9 inverter rating electric current) of a rating current of the inverter.
2. Reduction of the breakdown voltage
When using inverter at a place beyond 1,000m, the breakdown voltage decreases as follows.
1,000m or less: 1.00 / 1,500m: 0.95 / 2,000m: 0.90 / 2,500m: 0.85
But please do not perform the withstand pressure test as mention of the instruction manual.