Mitsubishi Electric FR-CC2-P Instruction Manual page 53

Control circuit
Operation while the 24 V external power is supplied
• Fault history and parameters can be read and parameters can be written using the operation panel keys.
• During the 24 V external power supply operation, monitored items and signals related to inputs to main circuit power supply,
such as input current and converter output voltage are invalid.
• The alarms, which have occurred when the main circuit power supply is ON, continue to be output after the power supply is
changed to the 24 V external power supply. Perform the converter reset or turn OFF then ON the power to reset the faults.
NOTE
• Inrush current equal to or higher than the 24 V external power supply specification may flow at power-ON. Confirm that the
power supply and other devices are not affected by the inrush current and the voltage drop caused by it. Depending on the
power supply, the inrush current protection may be activated to disable the power supply. Select the power supply and
capacity carefully.
• When the wiring length between the external power supply and the converter unit is long, the voltage often drops. Select the
appropriate wiring size and length to keep the voltage in the rated input voltage range.
• In a serial connection of several converter units, the current increases when it flows through the converter unit wiring near the
power supply. The increase of the current causes voltage to drop further. Use the converter units after confirming that the
input voltage of each converter unit is within the rated input voltage range. Depending on the power supply, the inrush current
protection may be activated to disable the power supply. Select the power supply and capacity carefully.
• When an external 24 V power supply is used, "E.P24" may appear if the power supply start-up time is too long (less than 1.5
V/s).
• "E.P24" may appear when the 24 V external power supply input voltage is low. Check the external power supply input.
• Do not touch the control circuit terminal block (circuit board) during the 24 V power supply operation (when conducted).
Otherwise you may get an electric shock or burn.
52
INSTALLATION AND WIRING