Jump to main content

Operation When Using External 24 V Power Supply

To operate the drive, de-energize the main circuit power supply and connect an external 24 V power supply to terminals PS-AC.

 

Function

Operation

Solution

Keypad

The keypad operates the same as when the main circuit power supply is ON. The drive will not detect oPr [Keypad Connection Fault].

-

Data Log

The data log function operates the same as when the main circuit power supply is ON.

The operation is different for different drive software versions. 1

-

Communications by Communication Option or MEMOBUS/Modbus Communication Terminals

Communication operates the same as when the main circuit power supply is ON.

-

MFAI

MFAI operates the same as when the main circuit power supply is ON.

-

MFAO

MFAO operates the same as when the main circuit power supply is ON.

-

MFDI

MFDI does not operate when the main circuit power supply of the drive is OFF.

Connect the external 24 V power supply to the MFDI selection common terminal (SC). 2

MFDO

Multi-Function Photocoupler Output

Fault Relay Output Terminal

MFDO operates the same as when the main circuit power supply is ON.

The operations of MFDO terminals and fault relay output terminals set for H2-xx = E [Fault] are different for different drive software versions. 3

-

Pulse Train Input

Pulse train input operates the same as when the main circuit power supply is ON.

-

Pulse train output

Pulse train output operates the same as when the main circuit power supply is ON.

-

Encoder Option Speed Detection (PG-B3, PG-X3, PG-F3, PG-RT3)

Encoder options do not operate when the main circuit power supply of the drive is OFF.

The operation to detect encoder option-related faults is different for different software versions.

When you use an encoder, make sure that the drive main circuit power supply is ON. 4

Analog Input Option (AI-A3)

Analog input options operate the same as when the main circuit power supply is ON.

-

Analog Output Option (AO-A3)

Analog output options operate the same as when the main circuit power supply is ON.

The operation is different for different drive software versions. 5

-

Digital Input Option (DI-A3)

Digital input options do not operate when the main circuit power supply of the drive is OFF.

Connect the external 24 V power supply to the Input signal common terminal (SC). 2

Digital Output Option (DO-A3)

Digital output options operate the same as when the main circuit power supply is ON.

-
 

When you use an external 24 V power supply, if you de-energize the main circuit power supply, the encoder option will not operate, even when you connect the external 24 V power supply to terminals PS-AC. When you use an encoder option, energize the drive main circuit power supply.

Note:

Yaskawa recommends that you use different external power supplies for the external power supply input terminals (PS-AC) and MFDI selection common terminal (SC) / Input signal common terminal (SC).

1

When you use an external 24 V power supply, the operation of the data log function is different for different drive software versions. On drives with software versions PRG: 09015 and later, you can continue the data log function.

Note:

The “PRG” column on the nameplate on the right side of the drive identifies the software version. You can also use U1-25 [SoftwareNumber FLASH] to identify the software version.

2

When you use MFDI and a Digital Input option (DI-A3), wire the terminals as shown in Wiring MFDI Terminals or Wiring Digital Input Option (DI-A3).

3

When you use an external 24 V power supply, the operation of the MFDO terminals are different for different drive software versions.

Note:

The “PRG” column on the nameplate on the right side of the drive identifies the software version. You can also use U1-25 [SoftwareNumber FLASH] to identify the software version.

  • Drive software versions PRG: 01028 and later

    When the main circuit power supply of the drive turns off, and you remove the cause of a fault and do a fault reset from the keypad, the fault relay output terminals and the MFDO terminals set for H2-xx = E, 10E [Fault] will change status.

  • Drive software versions PRG: 01027 and earlier

    When the main circuit power supply of the drive turns off, remove the cause of a fault and do a fault reset from the keypad. The fault relay output terminals and the MFDO terminals set for H2-xx = E, 10E [Fault] will keep the same status as before the main circuit power supply of the drive turned off. The fault code shown on the keypad will disappear.

4

If the motor shaft can rotate while the 24 V control power supply is energized and the main circuit power supply is de-energized, re-energize the 24 V control power supply and energize the main circuit power supply.

5

When you use an external 24 V power supply, the operation of the Analog Output option is different for different drive software versions. On drives with software versions PRG:09015 and later, the Analog Output option (AO-A3) can output the analog signals.

Note:

The “PRG” column on the nameplate on the right side of the drive identifies the software version. You can also use U1-25 [SoftwareNumber FLASH] to identify the software version.