The Haas Vector Drive and Servo Amplifiers
The Haas vector drive is the source of power for the spindle motor and the servo amplifiers. Haas builds the vector drive in three sizes at 20 HP, 40 HP, and 60 HP. A newer Haas Regen Vector Drive comes in one 40 HP size and is slated to replace the 20 HP and 40 HP drives.
Haas servo amplifiers come in 30A, 45A, 60A, and 90A versions that all operate the same way. Each amplifier powers one axis motor and takes its commands over a cable from the main processor. The 320V output cables of the vector drive carry power to the amplifiers.
Haas Drive and Amplifier Repair Shops
CNC Service Company
Marinette, WI
Brands: Haas
Control System Labs
Buffalo, NY
Brands: Haas
Global Electronic Services
Buford, GA
Brands: Fanuc, Haas, Okuma
Industrial Electronic Repair
Kernersville, NC
Brands: Haas
Precision Zone
Wheeling, IL
Brands: Haas, Okuma
Compare Haas Drive and Amplifier Repair Shops
This table lists turnaround, warranty, and evaluation terms from each shop's published information.
| Shop | Repair type | Turnaround (business days) | Warranty (months) | Free evaluation | Rush service |
|---|---|---|---|---|---|
| CNC Service Company | Ship-in repair | Not listed | 12 | Not listed | Not listed |
| Global Electronic Services | Ship-in repair | 3-5 | 24 | Yes | Yes |
| Industrial Electronic Repair | Ship-in repair | Not listed | 12 | Not listed | Not listed |
| Precision Zone | Ship-in repair | 7-10 | 12 | Yes | Yes |
Common Vector Drive Alarms
Alarm 123 SPINDLE DRIVE FAULT and alarm 993 SHORT CIRCUIT both report a short circuit detected by the vector drive. The Haas guide calls for an inspection of the vector drive and the wye-delta contactors for that short. Inspection then moves to the spindle motor and its cable.
Haas lists alarm 160 LOW INCOMING LINE VOLTAGE and alarm 292 HIGH VOLTAGE POWER SUPPLY FAULT in the same vector drive guide. The Haas inspection report asks for the incoming voltage at the main circuit breaker and the main transformer tap setting. A measured DC bus voltage at the drive gets compared with the DC bus reading in the control diagnostics.
Isolating the Fault Before a Drive Repair
Haas lists disconnect tests for a vector drive alarm that shows up at power on or at servos on. Each test starts with the power off and the drive fully discharged before one set of cables comes off. A reset with the spindle motor cables off points to the spindle motor, the wye-delta contactor, or the cabling.
A reset with the 320V output cables off and every axis but one disabled points to one of the servo amplifiers. A reset with the regen cables off points to the regen load. Haas requires the root cause found and fixed before a replacement vector drive powers on.
Servo Amplifier Checks
Haas checks a servo amplifier for a short with the axis motor cables disconnected at the amplifier. A meter on ohms from the ground screw to the red, white, and black terminals should read open. Any reading other than open means the amplifier is damaged.
Contaminated or pinched axis motor cables can cause a short and get checked along with the servo motor. The amplifier over temperature sensor trips at 195 °F (90 °C). Haas lists 122 °F (50 °C) as the maximum temperature for safe machine operation and calls for a check of the amplifier cooling fan.
Checks After a Drive Repair
On most Haas machines the spindle drive connects to the servo amplifiers. A bad amplifier powered on with a repaired drive can damage that drive and the other amplifiers. Burn marks on the input terminals of an amplifier call for a repair of that amplifier before the machine powers on.
A visual check of the spindle motor power and encoder cables looks for burnt pins, cuts, and twists. A multimeter check of each cable rules out shorts between the wires inside it. A megohm test of the motor power cable and of each spindle motor lead to ground checks the insulation before the repaired drive goes back in.