5.3. Master-Slave Multi-Rack System Operation

Multi-rack systems have many nodes connected to the MagnaLINK™ network. To accommodate this extra burden, the communications wiring is electrically isolated and the network traffic is routed between racks. The MagnaLINK Interface Device (MID-M), acts as repeater, where incoming messages originating from the master rack, RACK 1, are parsed and resent to the addressed slave rack, as illustrated in Fig. 5.1.

To configure two racks for master-slave operation, use the included RJ11 cable and wire JT3 in the master rack to JE3 of the slave rack. JE3 is on the Fan Control board located at the top of the rack. Connect another RJ11 cable from JR11 of the master to JT1 of the slave. Master and slaves contain MID-S, which acts as pass-through connections for simplifying master-slave wiring. Finally, connect the red and black CURRENT SENSE cable in RACK 2, SUB 11, to the common-mode choke located in the master, RACK 1, SUB 2. The instructions given for two rack, can be readily applied to addition racks. All cabinets must be grounded together and all CURRENT SENSE cables must connect back to the master rack. Instructions for programming new ratings are discussed in MagnaWEB.

Fig. 5.1 Multi-Rack System Diagram