FAQ000257060
27 May 2023
Sometimes we would like to test the drives with external 24V power supply when we are not able to install it to the 3-phase mains. Or we suspect the drive may have a failed control block or internal power supply. In below, I listed the expected behavior for ATV600s, and ATV900s when connected to the external 24V power supply. Please note ATV320 may behavior differently.
1. When we connect external power supply (24V) to "P24" port and "0V" / "COM", if the SW1 DIP switch in "SRC" or "SK", the drive will show "NLP", as in "No line power", when measuring, the STOA, STOB are having 24V, when checking IO map from the HMI, STOA and STOB are in high.
2. Same behavior when we connect external power supply (24V) to "24V" port and "COM", when the SW1 DIP switch in "SRC" or "SK", when measuring, the STOA, STOB are having 24V, when checking IO map from the HMI, STOA and STOB are in high.
3. When we connect external power supply (24V) to "P24" port and "0V", meanwhile having the DIP switch SW1 on "EXT", the drive still shows "NLP", when measuring, the STOA, STOB, we do not have 24V, when checking IO map from the HMI, STOA and STOB are in low. If we enable the line power, we will see "STO" as drive status.
4. If the external power is connected to "24V" and COM, the SW1 is on "EXT", the control will not power up. when line power is turned on, the drive will show "RDY", and STOA and STOB are 24V, when checking IO map from the HMI, STOA and STOB are in high.
| | SW1 on "SRC" or "SK" position | SW1 on "EXT" position | SW1 on "EXT" and turn on Line power |
| External 24V connected to "P24" | Control block LED on, HMI shows "NLP".
The 24V, STOA, STOB are measured 24VDC, the IO map shows high | Control block LED on, HMI shows "NLP".
The 24V, STOA, STOB are measured with 0VDC, the IO map shows low | Control block LED stays on, HMI shows "STO".
The 24V, STOA, STOB are measured with 0VDC, the IO map shows low |
| External 24V connected to "24V" | Control block LED on, HMI shows "NLP".
The 24V, STOA, STOB are measured 24VDC, the IO map shows high | Control block LED off, HMI no display.
The 24V, STOA, STOB are measured with 24VDC, no display, unable to see IO map | Control block LED on, HMI shows "NLP".
The 24V, STOA, STOB are measured 24VDC, the IO map shows high |
SW1 locations:
IO map found in: [Display] [I/O map][Digital Input Map] LIA-
