A05052 — Parallel circuit: Illegal current asymmetry

A05052 is the alarm Parallel circuit: Illegal current asymmetry. Where power units operate in parallel, the drive monitors the individual current of each power unit; when the deviation between these individual currents exceeds the alarm threshold configured in p7010, the drive raises this alarm. The alarm value in r2124 tells you which phase signalled the asymmetry. The manuals describe the code in the same way for the G130, G150, S120 and S150. Depending on the drive's configuration, the same condition can also be output as a fault (F) instead of an alarm.

• The deviation between the individual currents of the power units connected in parallel exceeds the alarm threshold specified in p7010.

1. Inhibit the pulses of the faulted power unit via p7001 (power units enable).
2. Check the connecting cables — loose contacts can cause current spikes.
3. Replace the motor reactors if they are non-symmetrical or faulty.
4. Calibrate the CTs or replace them.

• The drive writes the alarm value into r2124; interpret the value as a decimal number. This is the value behind the %1 placeholder in the message value.
• 1 — Phase U
• 2 — Phase V
• 3 — Phase W

• p7010 — current asymmetry alarm threshold of the parallel circuit: the threshold that the deviation of the individual power unit currents has exceeded, which triggered this alarm.
• r2124 — alarm value: read the decimal value here to determine the phase concerned (1 = U, 2 = V, 3 = W).
• p7001 — power units enable: use this parameter to inhibit the pulses of the faulted power unit, the first step of the remedy.

Output as an alarm, A05052 requires no acknowledgement. If the drive's configuration outputs the same condition as a fault instead, the fault reaction is NONE — neither on the Infeed nor on the vector drive objects is OFF1, OFF2, OFF3 or STOP2 executed — but the fault must be acknowledged IMMEDIATELY.