SRVO-061

Document alarm occurrence details

From the teach pendant, navigate to MENU → ALARM → F5 (HIST) to review alarm history. Note which axis amplifier (displayed in the alarm detail as 'Axis X') is affected, the exact time of occurrence, and whether the alarm is intermittent or persistent. Record the amplifier serial number from the physical label on the suspect amplifier module.

Check if the alarm occurs during specific motion patterns or always at power-up. Power-up failures indicate a hard circuit fault, while motion-triggered alarms may suggest thermal-related issues.

Perform controlled power cycle

Execute a complete power-down sequence: Press and hold FCTN + SHIFT on teach pendant, then perform an orderly shutdown if possible. Turn off the main power disconnect and wait a minimum of 5 minutes to allow all capacitors to fully discharge. Power up and observe if the alarm recurs immediately or after motion execution.

Ensure all motion is stopped and no programs are running before power cycling. Verify E-stop circuit is engaged during the shutdown procedure.

Check amplifier LED diagnostics

Open the controller cabinet and locate the affected axis amplifier. Observe the LED indicators on the amplifier faceplate during power-up. A clock error typically manifests as an abnormal LED pattern—refer to the amplifier label for the LED diagnostic chart. Normal operation shows green READY LED; red LEDs or no LEDs indicate hardware failure.

Work on electrical panels should only be performed by qualified personnel. Verify lockout/tagout procedures and ensure no voltage is present when working inside the cabinet.

Verify amplifier firmware version

From teach pendant: MENU → SYSTEM → F1 (TYPE) → F5 (SVAMP). Compare the firmware version of the affected amplifier against other axes. Mismatched or corrupted firmware can occasionally cause clock synchronization issues. Note the hardware series (αi-series, β-series, etc.) for replacement compatibility.

If firmware versions are inconsistent across axes, this may indicate a previous incomplete update attempt. However, true CKAL alarms are rarely firmware-related—hardware replacement is typically required.

Prepare for amplifier replacement

Since SRVO-061 indicates internal amplifier failure, arrange for a replacement amplifier matching the exact model and firmware. Document all servo parameters for the affected axis from MENU → SYSTEM → Variables → $SCR_GRP[x].$OVRTRIP. After replacement, you'll need to restore amplifier configuration and perform servo tuning verification.

Take photos of all DIP switch settings and cable connections before removing the failed amplifier. Some older R-30iA controllers require manual servo parameter entry after amplifier replacement.

Assess cabinet thermal conditions

Check the cabinet ambient temperature using the system monitoring: MENU → SYSTEM → F1 (TYPE) → F3 (TEMP). Verify that cabinet fans are operational and air filters are clean. Servo amplifiers should operate below 55°C (131°F). Inspect for blocked ventilation, failed fans, or excessive dust accumulation on amplifier heat sinks.

R-30iB controllers log over-temperature events. Check alarm history for SRVO-065 or SRVO-066 (over-temperature warnings) that may have preceded the CKAL alarm, indicating thermal stress.

Inspect for vibration damage

Examine the amplifier mounting and cabinet installation. Excessive vibration can cause micro-fractures in solder joints or damage to surface-mount components on the amplifier circuit boards. Check for loose mounting bolts, cabinet resonance, or proximity to impact-generating equipment. Look for physical evidence of vibration like chafed wires or loose connectors.

If vibration damage is suspected, all amplifiers in the cabinet should be inspected, not just the failed unit. Additional failures may be imminent.

Verify power supply quality

Check incoming AC power quality and voltage stability. Navigate to MENU → SYSTEM → F1 (TYPE) → F2 (POWER) to view DC bus voltage and power supply status. Measure incoming AC voltage at the main power input—should be within ±10% of nominal (200/220/240V or 380/400/480V depending on specification). Voltage spikes or brownouts can damage amplifier timing circuits.

Install a power quality monitor for 24-48 hours to capture transient events. Many CKAL failures in industrial environments are traced to repetitive voltage transients from nearby welders, large motors, or lightning strikes.

Check for electromagnetic interference sources

Inspect the cabinet and robot installation for EMI sources: improperly shielded servo cables, routing of signal cables near power cables, missing cable shield grounds, or nearby high-frequency equipment. Verify that all servo motor power cables use proper shielded cable with 360-degree shield termination at both ends.

Intermittent CKAL alarms that clear after power cycle and don't immediately recur may indicate EMI issues rather than hard amplifier failure. Try relocating susceptible equipment or improving cable shielding before replacing the amplifier.