ix

SJ300 Inverter

WARNING: The screws that retain the capacitor bank assembly are part of .............

6–13

the electrical circuit of the high-voltage internal DC bus. Be sure that all

 

power has been disconnected from the inverter, and that you have waited at

 

least 5 minutes before accessing the terminals or screws. Be sure the charge

 

lamp is extinguished. Otherwise, there is the danger of electrocution to

 

personnel.

 

CAUTION: Do not operate the inverter unless you have replaced the two .............

6–13

screws that connect the capacitor bank assembly to the internal DC bus.

 

Otherwise, damage to the inverter may occur.

 

CAUTION: Remove the fan assembly carefully, since it is attached to the .............

6–14

unit via connecting wires.

 

HIGH VOLTAGE: Be careful not to touch wiring or connector terminals .............

6–16

when working with the inverters and taking measurements. Be sure to place

 

the measurement circuitry above in an insulated housing before using them.

 

General Warnings and Cautions

WARNING: Never modify the unit. Otherwise, there is a danger of electric shock and/or injury.

CAUTION: Withstand voltage tests and insulation resistance tests (HIPOT) are executed before the units are shipped, so there is no need to conduct these tests before operation.

CAUTION: Do not attach or remove wiring or connectors when power is applied. Also, do not check signals during operation.

CAUTION: Do not stop operation by switching OFF electromagnetic contactors on the primary or secondary sides of the inverter.

Power

Ground fault

 

 

 

 

 

 

Input

interrupter

 

 

 

 

 

 

 

 

 

Inverter

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

MCCB

GFI

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

R, S, T

U, V, W

 

 

 

 

Motor

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

L1, L2, L3

FW

When there has been a sudden power failure while a Run command is active, then the unit may restart operation automatically after the power failure has ended. If there is a possibility that such an occurrence may harm humans, then install an electromagnetic contactor on the power supply side, so that the circuit does not allow automatic restarting after the power supply recov- ers. If an optional remote operator is used and the retry function has been selected, this will also allow automatic restarting when a Run command is active. So, please be careful.