Connection Schemes
Connection Schemes
CAUTION
Before attempting any connections, ensure power to rack is off by de-energizing input and output circuit breakers.
This section covers the realization of different output configurations available with this product line.
Stand-Alone Operation
A 120 Ohm resistor should be connected across the CAN-hi and CAN-lo terminals to properly terminate the bus. No other connections to this port are necessary for single unit operation.
Parallel Operation
When operated in this mode, up to ten XDI inverters can operate on a single bus by daisy chaining the canbus lines. Any additional units above this will still operate autonomously and not participate in load sharing arbitration. At power-up, the first ten units to access the bus acquire a unique I.D. each, beyond which no more I.D.s are made available. No unique master exists in a parallel system. All units continuously execute a complex algorithm to determine the load current based on the number of units online and the highest individual current. This ensures no interruption to the load should any unit in the system fail or is turned off.
Connection
•Make connections to the CAN/SYNC connector using its screw-type wire clamps. It may be necessary to remove the mating connector to facilitate connections to the terminal. Daisy chain the CAN-bus lines across all units in parallel (i.e. all CAN-hi terminals are connected together and likewise for CAN-lo). 120 Ohm terminating resistors must be connected across the CAN terminals of the first and last units in the chain.
•Also daisy chain the “SYNC-OUT 0” and “return” terminals on the connector. This provides phase lock between paralleled units. See Figure 2-8.