F35220 — TM: Frequency limit reached for signal output

F35220 is raised when the signals that Terminal Module 41 (TM41) puts out on tracks A/B have reached the limit frequency — from that point on the output signals are no longer in synchronism with the specified setpoint. Depending on the configured message type, the drive can also report the same condition as an alarm (A) or with no reaction (N) instead of as a fault.

• The A/B track output signals of the Terminal Module 41 (TM41) have reached the limit frequency and are no longer in synchronism with the specified setpoint.
• In SIMOTION operating mode (p4400 = 0): if the TM41 has been configured as the technology project, the fault is also output in response to short-circuited A/B signals in X520.
• In SINAMICS operating mode (p4400 = 1):
  • the fine resolution of the TM41 set in p0418 does not match that of the connector input interconnected at p4420;
  • the encoder position actual value r0479 interconnected at connector input p4420 has an excessively high actual speed;
  • the output signals correspond to a speed greater than the maximum speed of the TM41 (r1082).

1. Read p4400 first: it selects the TM41 operating mode, and which causes apply — and therefore which steps follow — depends on whether SIMOTION mode (p4400 = 0) or SINAMICS mode (p4400 = 1) is set.
2. Enter a lower speed setpoint in p1155.
3. Reduce the encoder pulse number in p0408.
4. In SIMOTION mode (p4400 = 0) additionally check track A/B for short-circuits.
5. In SINAMICS mode (p4400 = 1) verify the conditions the drive names as causes: the fine resolution in p0418 matches the connector input interconnected at p4420, the actual speed of r0479 is not excessively high, and the output signals do not correspond to a speed above the TM41 maximum speed r1082.

• p4400 — TM41 encoder emulation operating mode: read it first, because = 0 selects the SIMOTION causes and remedies and = 1 the SINAMICS ones.
• p1155 — speed setpoint 1 of the speed controller: enter a lower speed setpoint here in either operating mode.
• p0408 — rotary encoder pulse number: reduce it so the output frequency drops below the limit; the manual lists this step for both operating modes.
• p0418 — fine resolution of the TM41: in SINAMICS mode it must match that of the connector input interconnected at p4420.
• p4420 — connector input for the TM41 encoder emulation position setpoint: check here which signal is interconnected and with which fine resolution.
• r0479 — diagnostics encoder position actual value: read the actual speed here, because an excessively high speed at this input triggers the fault in SINAMICS mode.
• r1082 — maximum speed of the TM41: in SINAMICS mode the fault is raised when the output signals correspond to a speed greater than this value.

Acknowledge the fault immediately; a POWER ON also clears it, after which the drive can be restarted. The manual adds a warning for the alarm variant: The output signal is no longer monitored after changing the message type to "Alarm" (A).