Haas VF Series Operator's Manual

450
TECHNICAL REFERENCE
June 1999
96-8000
SERVO A MPLIFIERS
The brushless servo amplifier is a PWM based current source. The PWM outputs control the current to a three
phase brushless motor. The PWM frequency is either 12.5 KHz or 16 KHz. The amplifiers are current limited to
30 amps peak (45A peak for a medium amplifier. However there are fuse limits both in hardware and software to
protect the amplifiers and motors from over current. The nominal voltage for these amplifiers is 320 volts.
Therefore the peak power is about 9600 watts or 13 H.P. The amplifiers also have short circuit, over temperature
and over voltage protection.
There is a 15 amp (20A for a medium amplifier) supply fuse for failure protection. This fuse is relatively slow,
therefore it can handle the 30 amp peak. Current limit to the motor is controlled by software.
Commands to the amplifier are +/-5 volts current in two legs of the motor and a digital enable signal. A signal
from the amplifier indicates drive fault or sustained high current installed motor.
The connectors on the amplifiers are:
+H.V. +320 volts DC
-H.V. 320 volts return
A motor lead phase A
B motor lead phase B
C motor lead phase C
J1 Three pin Molex connector used for +/-12 and GND.
J2 Eight pin Molex connector used for input signals.

Haas VF Series Specifications

General

Machine Type	Vertical Machining Center
Control	Haas CNC Control
Z-Axis Travel	20-30 inches (varies by model)
Y-Axis Travel	16 - 30 inches (varies by model)
Spindle Motor	20-30 hp (depending on model)
Tool Capacity	20-40 tools (varies by model)