YASKAWA Varispeed G7 Series Instruction Manual page 61

* 11.Observe the following precautions when installing a breaker (or contactor) for emergency shutdowns on the D1000 (DC) side.
•First confirm that the Inverter and D1000 CHARGE indicators are not lit before turning ON the breaker (or contactor) on the D1000 output (DC) side.
If the breaker is turned ON during voltage charging, overcurrent will flow and there is a risk of damage to the parts.
•Always confirm that the breaker (or contactor) on the D1000 output (DC) side is turned ON before turning ON the power supply to the D1000.
Wiring the Output Side of Main Circuit
Observe the following precautions when wiring the main output circuits.
Connecting the Inverter and Motor
Connect output terminals U, V, and W to motor lead wires U, V, and W, respectively.
Check that the motor rotates forward with the Forward Run Command. Switch over any two of the output ter-
minals to each other and reconnect if the motor rotates in reverse with the Forward Run Command.
Never Connect a Power Supply to Output Terminals
Never connect a power supply to output terminals U, V, and W. If voltage is applied to the output terminals,
the internal circuits of the Inverter will be damaged.
Never Short or Ground Output Terminals
If the output terminals are touched with bare hands or the output wires come into contact with the Inverter cas-
ing, an electric shock or grounding will occur. This is extremely hazardous. Do not short the output wires.
Do Not Use a Phase Advancing Capacitor or Noise Filter
Never connect a phase advancing capacitor or LC/RC noise filter to an output circuit. The high-frequency
components of the Inverter output may result in overheating or damage to these part or may result in damage
to the Inverter or cause other parts to burn.
Never Use a Ground Fault Interrupter or Molded-case Circuit Breaker
Never connect a ground fault interrupter or molded-case circuit breaker to the output circuit of the Inverter.
The high-frequency components of the Inverter output may result in overheating or damage.
Connecting these parts may result in damage to the Inverter or cause other parts to burn.
Do Not Use a Magnetic Contactor
Never turn the magnetic contactor ON or OFF during operation when connected between the Inverter and
motor. If the magnetic contactor is turned ON while the Inverter is operating, a large inrush current will be cre-
ated and the overcurrent protection in the Inverter will operate.
When using a magnetic contactor to switch to a commercial power supply, stop the Inverter and motor before
operating the magnetic contactor. Use the speed search function if the magnetic contactor is operated during
operation. If measures for momentary power interrupts are required, use a delayed-release magnetic contactor.
Installing a Thermal Overload Relay
This Inverter has an electronic thermal protection function to protect the motor from overheating. If, however,
more than one motor is operated with one Inverter or a multi-polar motor is used, always install a thermal
relay (THR) between the Inverter and the motor and set L1-01 to 0 (no motor protection). The sequence
should be designed so that the contacts of the thermal overload relay turn OFF the magnetic contactor on the
main circuit inputs.
Wiring Main Circuit Terminals
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