Alarm — servo drive protection tripPatient Table Motion Control / Servo Drive

ERR44 — Patient table servo (A4) fault Err44 — absolute single turn counter error protection

Philips CT error code, reported by the Patient Table Servo Drive (Type A4).

What ERR44 means

On MX 16-slice CT CT systems, status code ERR44 indicates: Patient table servo (A4) fault Err44 — absolute single turn counter error protection. The code originates in the Patient Table Motion Control / Servo Drive section of the Patient Table Servo Drive (Type A4). Severity level alarm (Alarm — servo drive protection trip).

Reported action: The Patient Table Servo A4 drive reports "Err44" when its absolute single turn counter error protection trips. The guide lists this as a protection-function trip without a separate step-by-step repair procedure beyond the description; cycle power to reset the servo alarm, then inspect the subsystem implied by the code (encoder/EEPROM/external scale wiring, motor power supply, or travel-limit input as applicable) before returning the table to service. If the alarm recurs, treat it as a Patient Table Servo A4 drive fault requiring servo amplifier or motor/encoder replacement per Philips service procedures..

Documented in the Philips MX 16-slice CT Service Troubleshooting Guide (455019303481 Rev. G), Table 18 "Patient Table Servo A4 Error Codes", as a code displayed on the Patient Table Servo (Type A4) amplifier. Not confirmed by this document for other Philips CT systems or for the alternate Type A5 servo drive covered in the same guide.

Full troubleshooting for ERR44

The complete diagnosis, cause tree, and step-by-step remedy for the Patient Table Motion Control / Servo Drive subsystem are documented in the FSELIB Activion16 (TSX-031A) service manual — re-authored, web-first, with real figures.

Open the Activion16 service manual

Related Patient Table Motion Control / Servo Drive codes

ERR11Patient table servo (A4) fault Err11 — control power supply under-voltage protectionERR12Patient table servo (A4) fault Err12 — over-voltage protectionERR13Patient table servo (A4) fault Err13 — main power supply under-voltage protectionERR14Patient table servo (A4) fault Err14 — over-current protectionERR15Patient table servo (A4) fault Err15 — over-heat protectionERR16Patient table servo (A4) fault Err16 — over-load protectionERR18Patient table servo (A4) fault Err18 — over-regeneration load protectionERR21Patient table servo (A4) fault Err21 — encoder communication error protection
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Source: Philips MX 16-slice CT Service Troubleshooting Guide — 455019303481 Revision G (Preliminary, 3 February 2016). Reference information re-authored by FSELIB — not a copy of the OEM manual.