Operational Theory; Drive Input Power - Copley Controls Accelnet Plus BEL Series User Manual

Accelnet & Stepnet Plus Panels User Guide
3 O
PERATIONAL
3.1 D I
RIVE NPUT
Power distribution within Accelnet & Stepnet Plus Panels has a common ground which is isolated from the heatplate.
The CANopen, EtherCAT and MACRO network signals are isolated from all of the drive circuits.
L /S P
OGIC IGNAL
An internal DC/DC converter operates from the either the +HV or Aux inputs and creates the required
logic/signal operating voltages. Deriving internal operating voltages from the Aux input enables the drive to
stay on-line when the +HV power has been disconnected for emergency-stop or operator-intervention
conditions. This allows network and serial communications to remain active so that the drive can be monitored
by the control system while the +HV power is removed.
+HV P
OWER
The +HV input drives the high-voltage PWM outputs. When this is used without the Aux power, all of the drive
control and PWM output power is derived from the +HV power.
A P
UX OWER
The Aux input only drives the DC/DC converter and is diode-isolated from the PWM outputs. It has the same
voltage range as the +HV power and is recommended when the drives are in a network. The control core,
feedback devices, and network connections are all maintained by the Aux power so that the system controller
has visibility of the drive status, motor position, I/O states, etc. while the +HV is removed for safety,
loading/unloading work stations, etc.
PWM S
WITCHING
In some situations, such as when sampling small analog signals, it is desirable to synchronize the PWM
switching frequency among multiple drives. In these cases, one drive serves as a master for one or more slave
drives. The PWM sync output of the master sends a signal that is received as a PWM sync input by each slave.
T
HEORY
P
OWER
OWER
F S
REQUENCY YNCHRONIZING
16-01339 Rev 07