What it means
A07424 appears when the APC function (Advanced Positioning Control) has identified an invalid operating condition. Which condition applies is stored as an alarm value in r2124 and is to be interpreted in binary: bit 0 means APC is operating without an encoder, bit 1 or bit 2 means the load measuring system selected using p3701 has a fault or is in the park state. Depending on which bit is set, the drive disables the APC function itself or the pulse de-coupling.
Why it appears
- Bit 0 = 1: APC is operating without an encoder.
- Bit 1 = 1 or bit 2 = 1: the load measuring system for APC, selected using p3701, has a fault, or the load measuring system selected using p3701 is in the park state (r0481[0...2].14).
- When bit 1 is set, the APC function is disabled.
- When bit 2 is set, the pulse de-coupling is disabled, i.e. the speed of the motor measuring system is used as speed for the closed-loop motor speed control.
What to check
- Read the alarm value in r2124 in binary to see which bit is set.
- For bit 0: use the APC function only in operation with an encoder.
- For bit 1 and bit 2: check the load measuring system selected using p3701.
Reading the message value
- The drive stores the alarm value in r2124; the message value shows the fault cause in binary form.
- Bit 0 = 1: APC is operating without encoder.
- Bit 1 = 1: the load measuring system for APC, selected using p3701, has a fault, or the load measuring system selected using p3701 is in the park state (r0481[0...2].14). The APC function is disabled.
- Bit 2 = 1: the load measuring system for APC, selected using p3701, has a fault, or the load measuring system selected using p3701 is in the park state (r0481[0...2].14). The pulse de-coupling is disabled, i.e. the speed of the motor measuring system is used as speed for the closed-loop motor speed control.
Parameters the manual names
- r2124 (Alarm value): read it in binary for this alarm — it tells you which of the bits 0, 1 or 2 is set and therefore which invalid operating condition applies.
- p3701 (APC encoder selection): this is where the load measuring system used by APC is selected; it is the selection whose fault or park state triggers bit 1 or bit 2.
- r0481 (CO: Encoder status word Gn_ZSW): the encoder status word in which the park state of the load measuring system is signalled (r0481[0...2].14).
The same on every family
Every manual that describes A07424 gives it the same reaction, acknowledgement and message class.
| Drive family | Reaction | Acknowledge | Message class | Component | Manual |
|---|---|---|---|---|---|
| S120, S150 | — | — | Application/technological function faulted (17) | None | SINAMICS S120, S150 List Manual · p. 2810 |
The drives this code lives on
A07424 is described for S120, S150. These are the converters of those families in our catalogue — price on request.
Questions technicians ask
What does alarm A07424 mean?
The APC function (Advanced Positioning Control) has identified an invalid operating condition. The alarm value in r2124, read in binary, shows whether APC is running without an encoder or the load measuring system is faulty or parked.
What causes A07424?
Bit 0 is set when APC is operating without an encoder. Bit 1 or bit 2 is set when the load measuring system selected using p3701 has a fault or is in the park state (r0481[0...2].14).
How do I fix A07424?
Read r2124 in binary first to see which bit applies. For bit 0, use the APC function only in operation with an encoder; for bit 1 or bit 2, check the load measuring system.
What is disabled while A07424 is active?
With bit 1 the APC function is disabled. With bit 2 the pulse de-coupling is disabled, i.e. the speed of the motor measuring system is used as speed for the closed-loop motor speed control.
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 A07xxx group · SINAMICS manuals · Siemens manuals