96-8100 1-15-96
154
TECHNICAL REFERENCE
SERVICE
MANUAL
VF-SERIES
The motor output circuit is fuse protected at 20 amps but this will only blow if there is a drive failure as the current limit
circuit is much faster than the fuses.
The PWM signal is provided by the Motor Interface PCB along with direction and H drive state control. The processor also
monitors the overcurrent status from the drive card.
The connectors on the servo drive cards are:
P8 160V DC from SDIST PCB
P1 low voltage AC power from SDIST PCB
P3 PWM and H drive control signals
P2 Power connection to servo motor
There are three fuses on each servo drive card. One is in series with each leg of the servo motor. These fuses are type ABC
and are rated at 20 amps, 200V DC A third fuse on each driver card limits the plus (+) side of the power supplied to each
card; this fuse is an ABC, 250V.
4.8 SERVO ENCODERS (BRUSHLESS)
Some Haas machines are equipped with brushless motors, which provides for better performance, and no maintenance. In
addition to the performance differences, these machines differ from brush type machines, which have already been dis-
cussed, in the following areas:
The brushless motors have 8192 line encoders built in, which result in differences in acceleration parameters 7, 21,35,49
and 157. The exponential accel/decel time is set by parameters 115, 116 and 168. In Position parameters 101, 102, 103,
104 and 165 are also affected by brushless motors.
The motor controller board has a dedicated processor which does all the servo control algorithm.
There is no servo distribution board anymore, therefore there is no CHARGE light present. Care should still be taken how-
ever, since there are high voltages present on the amplifiers, even when power is shut off. The high voltage comes from the
spindle drive, which does have a CHARGE light.
The servo drive cards are replaced by Brushless Servo Amplifiers, and are controlled differently.
A low voltage power supply card is added to the servo drive assembly to supply the low voltage requirement to the
amplifiers.
The CNC software is version 9.xx.
The user interface and motion profiling have not changed however, and the user should not see any functional differences
between a brush type machine and a brushless machine.
To Next Page
Loading...
Need help?
General
