User Manual – Rev AY AMETEK Programmable PowerMX Series 683.8 Multiple Cabinet System Configurations (incl. –MB)Multi-cabinet MX models consist of two or three autonomous or Auxiliary MX45-3Pi units.Auxiliary units do not have their own controller and are identified easily by their blank front panel(except for status indicator LEDs). Master units each have their own controller but can beconfigured as auxiliary units by disconnecting the ribbon cable marked J17 between thecontroller and the system interface board (P/N 7003-700-1 or P/N 7003-715-1). This disables thecontroller and allows the MX45 to operate as an Auxiliary unit. (Requires removal of the topcover). See section 4.2.11.5 for information on setting the SYSTEM field in the configurationmenu when changing configurations on MX systems with the –MB (Multi-box) option.When used as a multi-cabinet system for higher power applications, the controllers in the unit(s)acting as the auxiliary to the master are either disabled or not present. For normal systemconfigurations such as MX90-3Pi, the auxiliary unit will not have a controller or front panel andwill have been factory configured for auxiliary operation.For –MB systems such as MX90-3Pi-MB, the controller in the auxiliary unit must be disabledusing S1. The SYSTEM field in the master unit controllers CONFIGURATION SETUP 3 screenmust be set to the correct system configuration setting as well. The SYSTEM field for thecontroller in the auxiliary unit must be set to AUX if it is used as an auxiliary unit. See section4.2.11.5.Note: New SYSTEM field configuration settings do not take effect until power is cycled.In addition to disabling the controller if present (as described above), the DIP switch (S1) locatedon the GPIB / RS232C / IO assembly in the auxiliary cabinets. (Requires removal of the topcover). The correct switch settings are shown below. (shown set for Master cabinet). Note that allunits must be powered down before reconfiguring. Also, the output wiring must be changed toaccommodate the new configuration.Note: If the units being re-configured for multi-cabinet operation were not factoryconfigured this way, it may be necessary to balance the amplifiers by adjustingtheir gain. Refer to section 6.4 for details on Amplifier balancing.When used as a multi-cabinet system, the system interface cables must be connected betweenthe master and the auxiliary cabinets.Note: If the –MB system has the –ES emergency shut off switch option, it is required toconnect the ES BNC’s between master chassis. See section 3.7.8.
