Power Electronics / Power Management


Permanent power monitoring helps maximise availability

20 October 2004 Power Electronics / Power Management

Active PSM power system module is the name of Rittal 's new series of active power-socket modules that incorporate a permanent display of the total current per plug-in module in a rack. User-defined limit values, switching delay times and warning functions provide reliable protection against overloads. Some benefits are: lower operating costs thanks to remote administration, reduced installation costs through 'on-demand' expandability and the investment safeguards of a scalable system, says the company.

Two independent three-phase supplies of the Rittal solution each provide up to 48 A - ie, max 96 A in total. The shock-hazard-protected vertical supply busbar accommodates up to seven plug-in modules over its 2000 mm height.

An additional special feature of the active PSM system is the informative user interface. Rittal integrated current measurement and a corresponding display into the active power system module. It is possible to monitor the instantaneous current load per socket module, which minimises risks of overloading. A three-digit display indicates the current value. Where limit values have been defined for each module, an LED (red/green) signals the system status. If the current consumption approaches the critical level at which the built-in fuse could be tripped, the red LED and an integrated beeper give a timely warning. The built-in fuse itself is also monitored. Since the module can be rotated by 180° in installation, an integrated clinometer ensures proper orientation of the figures on the display.

Rittal has incorporated the active PSM system into its CMC-TC monitoring concept, so, in this way, all the operating parameters can be configured and managed remotely from a central administrator PC via http and/or SNMP. Alarm messages are also generated automatically when the defined current limits are reached and can then be evaluated from a central control office.



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