A32443 — Encoder 2: Signal level track C/D outside tolerance (alarm)

A32443 reports that the unipolar signal level on the C/D tracks of Encoder 2 has left the permissible tolerance. The drive monitors the level across CP/CN and across DP/DN: the unipolar nominal signal level of the encoder must lie in the range 2500 mV +/- 500 mV, and the response thresholds are below 1700 mV and above 3300 mV. The manuals print this message as Encoder 2: Signal level track C/D outside tolerance (alarm) and as Encoder 2: Unipolar CD signal level outside specification — both titles describe the same condition. Depending on how the drive is configured, the same condition can also be issued as a fault (F) or with no reaction (N). Note that the signal level is only evaluated when the Sensor Module properties are available (r0459.31 = 1) and when monitoring is active (p0437.31 = 1).

• The unipolar signal level for Encoder 2 — measured across CP/CN or across DP/DN — lies outside the permissible tolerance.

1. Check that the encoder cables and the shielding are routed in compliance with EMC.
2. Check the plug connections and the contacts of the encoder cable.
3. Check whether the C/D tracks are connected correctly — have the signal cables CP and CN, or DP and DN, been interchanged?
4. Replace the encoder cable.

• The drive stores the alarm value in r2124 and outputs it in the message value as the fault cause in binary.
• Bit 0 = 1: either CP or CN is outside the tolerance.
• Bit 16 = 1: either DP or DN is outside the tolerance.

• r2124 — alarm value: read it here, interpreted in binary, to see whether the CP/CN pair (bit 0) or the DP/DN pair (bit 16) raised the alarm.
• r0459 — extended Sensor Module properties: the C/D signal level is only evaluated when bit 31 is set (r0459.31 = 1), i.e. when the Sensor Module properties are available.
• p0437 — extended Sensor Module configuration: monitoring of the signal level must be switched on here (p0437.31 = 1), otherwise the level is not evaluated at all.

As an alarm, A32443 does not bring the drive into a different operating state and no acknowledgement is required; once the unipolar level is measured inside the tolerance again, the condition is gone. If the drive is configured to issue the same condition as a fault instead, that fault must be acknowledged immediately after the cause has been rectified.