Mitsubishi Electric 800 Series Instruction Manual page 43

Control circuit
2.6.5
When supplying 24 V external power to the
control circuit
Connect a 24 V external power supply across terminals +24 and SD. Connecting a 24 V external power supply enables I/O
terminal ON/OFF operation, operation panel displays, control functions, and communication during communication operation
even at power-OFF of inverter's main circuit power supply. When the main circuit power supply is turned ON, the power
supply source changes from the 24 V external power supply to the main circuit power supply.
Specification of the applicable 24 V external power supply
Item
Input voltage 23 to 25.5 VDC
Input current 1.4 A or less
Commercially available products (as of February 2015)
S8JX-N05024C

Specifications: Capacity 50 W, output voltage (DC) 24 V, output current 2.1 A
Installation method: Front installation with cover
or
S8VS-06024

Specifications: Capacity 60 W, output voltage (DC) 24 V, output current 2.5 A
Installation method: DIN rail installation

For the latest information about OMRON power supply, contact OMRON corporation.
Starting and stopping the 24 V external power supply operation
• Supplying 24 V external power while the main circuit power is OFF starts the 24 V external power supply operation.
Likewise, turning OFF the main circuit power while supplying 24 V external power starts the 24 V external power supply
operation.
• Turning ON the main circuit power stops the 24 V external power supply operation and enables the normal operation.
NOTE
• When the 24 V external power is supplied while the main circuit power supply is OFF, the inverter operation is disabled.
• In the initial setting, when the main power supply is turned ON during the 24 V external power supply operation, a reset is
performed in the inverter, then the power supply changes to the main circuit power supply. (The reset can be disabled using
Pr.30. (For the details of Pr.30, refer to the FR-A800 Instruction Manual (Detailed).))
Confirming the 24 V external power supply input
• During the 24 V external power supply operation, the 24 V external power supply operation signal (EV) is output. To use the
EV signal, set "68 (positive logic) or 168 (negative logic)" in one of Pr.190 to Pr.196 (output terminal function selection)
to assign function to an output terminal.
Operation while the 24 V external power is supplied
• Fault history and parameters can be read and parameters can be written (when the parameter write from the operation
panel is enabled) using the operation panel keys.
• The safety stop function is invalid during the 24 V external power supply operation.
• During the 24 V external power supply operation, monitored items and signals related to inputs to main circuit power supply,
such as output current and converter output voltage are invalid.
• The faults, 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 inverter reset or turn OFF then ON the power to reset the faults.
• If the power supply changes from the main circuit power supply to the 24 V external power supply while measuring the main
circuit capacitor's life, the measurement completes after the power supply changes back to the main circuit power supply
(Pr.259 = "3").
• The output data is retained when "1 or 11" is set in Pr.495 Remote output selection.
42
INSTALLATION AND WIRING
Rated specification
Model Manufacturer
OMRON Corporation