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The A06B-6090-H244 is the SVUC2-40/40 — both channels at equal current class, equal capability, equal drive output. It was built for machines where two axes run identical motors at matched loads: twin-column machining centres, dual-pallet horizontal mills, synchronized twin-spindle lathes, and similar configurations where the load profiles on both axes are the same.
The 40/40 designation means neither axis is the "primary" — both channels share the same 8.7A rated continuous output.
This is a 6090-series Alpha C amplifier: a self-contained unit that rectifies its own incoming three-phase AC, generates the DC link internally, and does not depend on an external shared PSM power supply module. Incoming three-phase AC and the motor power cables are the primary connections on the machine side, along with the control interface to the CNC
| LED | Alarm | Description |
|---|---|---|
| 1 | HV | Over voltage |
| 2 | LV | Low control power voltage |
| 3 | LVDC | Low DC link voltage |
| 4 | DCSW | Regenerative control circuit fault |
| 8 | HCL | L-axis over current |
| 9 | HCM | M-axis over current |
| 8. | IPML | L-axis IPM alarm (dotted) |
| 9. | IPMM | M-axis IPM alarm (dotted) |
| b | — | L + M axes over current (simultaneous) |
| b. | — | L + M axes IPM alarm (simultaneous) |
The dot (decimal) matters. Codes 8 and 9 without dot (HCL, HCM) point toward motor wiring or insulation checks first. Codes 8. and 9. with dot indicate an IPM-level fault in the transistor module itself. A "b" alarm with both channels simultaneous typically points to a shared fault — DC link collapse, common cable ground fault — rather than two independent channel failures.
| Parameter | Value |
|---|---|
| Part Number | A06B-6090-H244 |
| Designation | SVUC2-40/40 |
| Interface | PWM Type A |
| Input | 200–230V AC, 3-phase |
| Input Current | 17A @ 200V |
| L-axis Output | 8.7A |
| M-axis Output | 8.7A |
| Rated Power | 9.5 kW |
| Control Card | A20B-2002-0032 |
| Power Card | A20B-2002-0157 |
| Compatible CNC | Series 15, 16, 18, 21 |
Q1: The A06B-6090-H244 is listed as replacing the 6066-H244. Are they interchangeable on any machine with the original 6066?
Only with interface verification. Both are SVUC2-40/40 units driving the same motors, but the 6066 uses a Type B PWM interface and the 6090 uses Type A. On machines originally built with 6066 hardware and Type B CNC interface wiring, the 6090 cannot simply be plugged in without verifying or adapting the interface. For machines already running a 6090 H244, a replacement unit connects directly.
Q2: Both axes stopped together and the LED shows alarm "b". Where should diagnostics start?
Alarm "b" is simultaneous over-current on both L and M channels — on a shared-DC-link unit this typically points to a shared fault, not two independent channel failures. Check the DC link voltage first. If the DC link is healthy, inspect both motor power cables for a common ground fault or short in the cabinet wiring. If the display shows "b." with a decimal, that is an IPM-level alarm on both channels — the transistor modules are the likely failure point.
Q3: Does the A06B-6090-H244 require a separate PSM power supply like the later Alpha i SVM does?
No. The 6090 SVUC series rectifies its own incoming three-phase AC and generates the DC link internally — it is self-contained. This is the same architecture as the 6093 Beta SVU series. No external shared DC bus is required. The only optional external accessory is a separate regenerative discharge unit on machines with high regenerative energy duty cycles.
Q4: My machine has matched α12 motors on both axes. Is H244 correct, or should I consider H246?
H244 (SVUC2-40/40) is correct for matched α12 motors. The α12 falls within the 40-class current range, and H244 provides equal 8.7A on both channels. H246 (SVUC2-40/80) is for asymmetric motor pairs — 40-class on L, larger motor on M. H266 (SVUC2-80/80) is for two larger motors. If both axes use identical α12 motors, H244 is the right unit.
Q5: The 6090 series is discontinued. What are the realistic long-term options?
Three paths: stock a spare unit now while new-old-stock and inspected used examples are still available in the aftermarket; plan a servo system upgrade in conjunction with a CNC retrofit; or use specialist repair services that rebuild 6090 units by replacing failed capacitors and IGBT modules — the known age-related failure components. Contact suppliers for current stock positions — availability changes quickly on discontinued units of this age.
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