DIGITAL HALL SIGNALS
Hall signals are single-ended signals that provide absolute feedback within one
electrical cycle of the motor. There are three of them (U, V, & W) and they may be
sourced by magnetic sensors in the motor, or by encoders that have Hall tracks as
part of the encoder disc. They typically operate at much lower frequencies than the
motor encoder signals, and are used for commutation-initialization after startup,
and for checking the motor phasing after the amplifIer has switched to sinusoidal
commutation. Resolver models can also take Hall signal at inputs [IN6~8]. See
page 15 for connections.
HALL
U, V, W
10 k
3.3 nF
74HC14
+5V
10 k
U
V
W
Xenus XTL
™
DIGITAL SERVO DRIVE
for BRUSHLESS/BRUSH MOTORS
Copley Controls, 20 Dan Road, Canton, MA 02021, USA Tel: 781-828-8090 Fax: 781-828-6547
Tech Support: E-mail: sales@copleycontrols.com, Internet: http://www.copleycontrols.com Page 10 of 30
DIGITAL OUTPUTS
The digital outputs are open-drain MOSFETs with 1 kΩ pull-up resistors in series with a
diode to +5 Vdc. They can sink up to 1 Adc from external loads operating from power
supplies to +30 Vdc.
The output functions are programmable. The active state of the outputs is programmable
to be on or off.
When driving inductive loads such as a relay, an external y-back diode is required. The
internal diode in the output is for driving PLC inputs that are opto-isolated and connected
to +24 Vdc. The diode prevents conduction from +24 Vdc through the 1 kΩ resistor to
+5 Vdc in the drive. This could turn the PLC input on, giving a false indication of the drive
output state.
BRAKE OUTPUT [OUT4]
This output is an open-drain MOSFET with an internal yback diode connected to the +24
Vdc input. It can sink up to 1A from a motor brake connected to the +24 Vdc supply.
The operation of the brake is programmable with CME 2. It can also be programmed as
a general-purpose digital output.
OUTPUTS
MOTOR PHASE CONNECTIONS
The drive output is a three-phase PWM inverter that converts the DC buss voltage
(+HV) into three sinusoidal voltage waveforms that drive the motor phase-coils.
Cable should be sized for the continuous current rating of the motor. Motor cabling
should use twisted, shielded conductors for CE compliance, and to minimize PWM
noise coupling into other circuits. The motor cable shield should connect to motor
frame and the drive frame ground terminal (J2-1) for best results.
MOTOR CONNECTIONS
Motor connections are of three types: phase, feedback, and thermal sensor. The phase connections carry the drive output currents that
drive the motor to produce motion. A thermal sensor that indicates motor overtemperature is used to shut down the drive to protect
the motor. Feedback can be digital quad A/B encoder, analog sin/cos encoder, resolver or digital Halls, depending on the version of the
drive.
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