Power Supplies; Grounding Considerations - Copley Controls Xenus R10 Manual

Accelnet R23
POWeR SuPPlIeS
Accelnet Micro Module operates typically from transformer-isolated, unregulated DC power supplies.
These should be sized such that the maximum output voltage under high-line and no-load conditions
does not exceed the drive maximum voltage rating. Power supply rating depends on the power delivered
to the load by the drive.
operation from regulated switching power supplies is possible if a diode is placed between the power
supply and drive to prevent regenerative energy from reaching the output of the supply. If this is done,
there must be external capacitance between the diode and drive. The minimum value required is 330
µf per drive mounted no more than 12 inches from the drive.
AuX HV (OPTIOnAl)
CAnopen communications can be maintained when +HV is turned off by using the Aux HV input. The voltage has the same range as +HV, and can be
greater or less than +HV.
In operation, the Aux HV keeps the drive logic and control circuits active so it is always visible as a node on a CAn bus. The current-position data is
maintained making 'homing' unnecessary after system power is re-enabled. If Accelnet Micro Module is operating as a stand-alone drive, Aux HV is not
necessary but can be useful if the controller is monitoring drive digital outputs.
GROunDInG COnSIDeRATIOnS
Power and control circuits share a common circuit-ground (P1-3, 4, 27, 33, 34, and J1-13, 14). Input logic circuits are referenced to Signal Ground, as are
power GnD, digital outputs, and encoder. for this reason, drive Gnd terminals should connect to the users' common ground system so that signals between
drive and controller are at the same common potential, and to minimize noise. The system ground should, in turn, connect to an earthing conductor at
some point so that the whole system is referenced to "earth".
Because current flow through conductors produces voltage-drops across them, it is best to connect the drive HV GnD to system earth, or circuit-common
through the shortest path, and to leave the power-supply floating. In this way, the power supply (-) terminal connects to ground at the drive HV Return
terminals, but the voltage drops across the cables will not appear at the drive ground, but at the power supply negative terminal where they will have
less effect.
for Ce compliance drive cables should be shielded. Motor phase currents are balanced, but currents can flow between the PWM outputs, and the motor
cable shield.
Signals from controller to drive are referenced to +5 Vdc, and other power supplies in user equipment. These power supplies should also connect to system
ground and earth at some point so that they are at same potential as the drive circuits. The final configuration should embody three current-carrying
loops. first, the power supply currents flowing into and out of the drive at the +HV and Gnd pins on J1. Second, the drive outputs current into and out of
Copley Controls, 20 Dan Road, Canton, MA 02021, USA
Tech Support: E-mail: sales@copleycontrols.com, Internet: http://www.copleycontrols.com
RUGGEDIZED DIGITAL
SERVO DRIVE fOR
BRUSHLESS/BRUSH MOTORS
the motor phases, and motor shield currents circulating between
the u, V, and W outputs and HV common. And, lastly, logic and
signal currents connected to the drive control inputs and outputs.
for Ce compliance drive cables should be shielded. Motor phase
currents are balanced, but currents can flow between the PWM
outputs, and the motor cable shield.
Tel: 781-828-8090
R23
RoHS
Fax: 781-828-6547
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