What it means
F01662 is raised when the converter module detects a communication error inside itself. The drive coasts down (OFF2) and only restarts once the fault has been acknowledged with a POWER ON, i.e. the power supply is switched off and on again. On the G115D the manual lists the same code under the title 'CU hardware fault'.
Why it appears
- A module-internal communication error has occurred.
What to check
- Carry out a POWER ON: switch the power supply off and then on again.
- Check the electrical cabinet design and the cable routing for EMC compliance.
- Check whether an impermissible voltage is connected at one of the digital outputs.
- Check whether a digital output is loaded with an impermissible current.
- Upgrade the firmware to a later version.
- If the fault persists, contact Technical Support.
The G120C manual orders the two digital-output checks first and only asks for the switch-off/switch-on if these checks are unsuccessful.
Reading the message value
- The drive writes the fault value to r0949; the manual says to interpret it hexadecimal.
- The content is
Only for internal Siemens troubleshooting
— no decoding of the value is published for this code.
Parameters the manual names
- r0949 (fault value) — holds the value belonging to F01662; interpret it hexadecimal, knowing that the manual states it serves internal Siemens troubleshooting only.
Acknowledging and restarting
Acknowledgement requires a POWER ON: switch the converter power supply off and on again. If F01662 returns, work through the checks above — cabinet design and cable routing for EMC compliance, then the voltage and current load on the digital outputs — and afterwards upgrade the firmware or contact Technical Support.
What differs between the drive families
Straight from the manuals' own fields — F01662 is not described identically everywhere.
| Drive family | Reaction | Acknowledge | Message class | Component | Manual |
|---|---|---|---|---|---|
| G120 | OFF2 | POWER ON | Hardware/software error (1) | — | SINAMICS G120 · p. 846 |
| G120XA | OFF2 | POWER ON | — | — | SINAMICS G120XA PN converter · p. 1113 |
| G120C | — | — | — | — | SINAMICS G120C Converters · p. 383 |
| G115D | — | — | — | — | SINAMICS G115D distributed drive · p. 392 |
The drives this code lives on
F01662 is described for G115D, G120, G120C, G120XA. These are the converters of those families in our catalogue — price on request.
Questions technicians ask
What does fault F01662 mean on a SINAMICS drive?
It reports a module-internal communication error. The drive coasts down with OFF2 and the fault can only be acknowledged by a POWER ON.
How do I clear F01662?
First switch the power supply off and on again. If the fault comes back, check the cabinet design and cable routing for EMC compliance, check the digital outputs for impermissible voltage and current load, upgrade the firmware, and contact Technical Support.
What is stored in r0949 for F01662?
The fault value, which is to be interpreted hexadecimal. The manual states it is only for internal Siemens troubleshooting, so no decoding is published.
Can the digital outputs be involved in F01662?
Yes, the remedy explicitly asks to check whether an impermissible voltage is connected at one of the digital outputs and whether a digital output is loaded with an impermissible current.
Codes next to this one
Source
Written from Siemens' own List Manuals and operating instructions; every number, designation and parameter on this page is checked against them before publication.
All SINAMICS codes: fault and alarm codes · the F01xxx group · SINAMICS manuals · Siemens manuals