Delta Tau GEO BRICK DRIVE Manuel D’Utilisation
Geo Brick Drive User Manual
Pinouts and Software Setup
156
Note
The Geo Brick Drive endorses U, V, and W nomenclature for phases 1
through 3 respectively. Some motor manufacturers will call them A,
B, and C. Others may call them L1, L2, and L3.
through 3 respectively. Some motor manufacturers will call them A,
B, and C. Others may call them L1, L2, and L3.
For wiring DC brush motors, use phases U and W, and leave V floating:
U
W
GND
GND
Tie cable shield to shield stud
or chassis ground.
DC brush motor wiring
Motor Cable, Noise Elimination
The Geo Brick Drives’ voltage output has a fundamental frequency and amplitude that corresponds to
motor speed, torque, and number of poles. As a Direct Digital PWM Drive, the Geo Brick produces
higher frequency voltage components corresponding to the rise, fall and repetition rate of the fast
switching PWM signals. Subsequently, it could naturally couple current noise to nearby conductors. This
electrical coupling can be problematic, especially in noise-sensitive applications such as using high-
resolution sinusoidal encoders, or high rate of communication which could suffer from Electro-Magnetic
Interference EMI. Proper grounding, shielding, and filtering can alleviate most noise issues. Some
applications may require additional measures such as PWM edge filters. The following; are general
guidelines for proper motor cabling:
motor speed, torque, and number of poles. As a Direct Digital PWM Drive, the Geo Brick produces
higher frequency voltage components corresponding to the rise, fall and repetition rate of the fast
switching PWM signals. Subsequently, it could naturally couple current noise to nearby conductors. This
electrical coupling can be problematic, especially in noise-sensitive applications such as using high-
resolution sinusoidal encoders, or high rate of communication which could suffer from Electro-Magnetic
Interference EMI. Proper grounding, shielding, and filtering can alleviate most noise issues. Some
applications may require additional measures such as PWM edge filters. The following; are general
guidelines for proper motor cabling:
Use a motor cable with high quality shield. A combination braid-and-foil is best.
The motor drain wires and cable shield should be tied together, and attached at both ends
of the motor and Geo Brick Drive chassis. At the motor end, make a 360 degree connection
between the shield and motor frame. If the motor has a metal shell connector, then you can tie the
shield directly to the metal shell of the mating connector. The connection between the cable
shield and the motor frame should be as short as possible). At the Geo Brick Drive end, make a
360 degree connection between the shield and the provided studs or grounded chassis (protection
earth) at the M4 mounting screws.
of the motor and Geo Brick Drive chassis. At the motor end, make a 360 degree connection
between the shield and motor frame. If the motor has a metal shell connector, then you can tie the
shield directly to the metal shell of the mating connector. The connection between the cable
shield and the motor frame should be as short as possible). At the Geo Brick Drive end, make a
360 degree connection between the shield and the provided studs or grounded chassis (protection
earth) at the M4 mounting screws.