Sirman E8 Error Code

What does Sirman E8 mean?

The PLD 300-330-350 AUT control system has detected that the DC bus voltage has risen above the maximum safe threshold. This over-voltage condition is the inverse of E7 and is triggered when the internal bus voltage exceeds what the drive can safely handle. Per Sirman's manual, the primary check is the incoming mains supply voltage, as an elevated or unstable mains input directly causes an over-voltage condition on the DC bus.

Symptoms

• Display shows 'E8' and the machine shuts down immediately or fails to start.
• Fault may appear at startup before any motor movement begins.
• E8 occurs consistently and does not clear with simple power cycling.
• Other sensitive equipment on the same supply circuit may also exhibit erratic behavior.
• Fault may correlate with known utility overvoltage events or times of low facility load.

Common causes

• Incoming mains supply voltage is too high or outside the maximum rated voltage for the PLD model.
• Utility supply delivering elevated voltage outside nominal tolerance, particularly during low-load periods.
• Incorrect supply voltage connected to the machine (e.g., wrong phase configuration or wrong tap on a transformer).
• Regenerative voltage spike fed back into the bus if the motor is decelerated too rapidly by an external factor.
• Failed or degraded overvoltage clamping components (e.g., varistors) on the power board no longer suppressing transients.
• Loose neutral connection on the supply causing voltage imbalance and elevated phase voltage.

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Diagnostic steps

1. Measure incoming mains voltage

   Use a calibrated multimeter to measure the supply voltage at the machine's outlet or terminal block. Confirm it is within the rated voltage range printed on the Sirman PLD 300-330-350 AUT nameplate.

2. Check for supply overvoltage

   If the measured voltage exceeds the rated maximum, contact the facility electrician or utility provider immediately, as operating the machine on an overvoltage supply risks permanent damage to the drive and motor.

3. Verify phase and wiring configuration

   Confirm the machine is connected to the correct supply phase and voltage configuration as specified in Sirman's installation instructions. Miswiring to a higher-voltage phase is a direct cause of E8.

4. Inspect neutral and earth connections

   Check for a loose or missing neutral conductor at the supply point, as a broken neutral can cause one phase to rise significantly above nominal voltage. Tighten all terminal connections.

5. Monitor supply over time

   If voltage is borderline high, use a data-logging multimeter or power quality analyser to record supply voltage over several hours. Intermittent overvoltage from the utility will be captured in the log and can be presented to the supplier.

6. Inspect power board for damage

   If mains voltage is confirmed normal but E8 persists, inspect the power board for damaged overvoltage protection components such as burned varistors or discolored PCB areas, indicating the board has sustained damage and requires replacement.

When to call a professional

Escalate immediately to a licensed electrician if measured mains voltage exceeds the rated maximum for the PLD 300-330-350 AUT, as this is a safety-critical supply fault that endangers both personnel and equipment. Escalate to a Sirman-authorised technician if supply voltage is confirmed normal but E8 persists, indicating an internal power board fault requiring component-level diagnosis and replacement beyond standard field service.