140CPU67160C CPU module

Miniature circuit breaker (MCB) discrimination studies should be carried out when designing the system power distribution.The graph shows the response of a single Power Module to severe overloads. As the load is increased the power supply protection mechanism operates and shuts down the output. It can be seen that for a period of just in excess of 200 ms the Power Module can provide currents up to 115 A or 380 % of its stated maximum(115/31 = 3.8). This 200 ms/380 % can be extrapolated for additional power supplies in order to perform MCB discrimination studies.Active power factor correction circuitry ensures that this Power Pack meets the requirements of IEC 61000-3-2.When using this table to calculate cable feed requirements, allow, at a minimum, an extra 3 % for variations between units. Actual measured results will depend upon the harmonic content of the input voltage waveform.

General Description 

The Power Port is a supplied accessory and is fitted onto the rear of the Power Shelf. It converts alarm signals produced by the Power Packs and Power Shelf into volt-free alarm contacts for use by the system and enables hot replacement of Power Packs. It consists of a PCB fitted with connectors, relays and miscellaneous electronic components. The shape and size of the Power Port is shown in Figure 11.The alarm contacts are made available on a connector for ease of wiring into the system. The system provides a supply for the Power Port, which is wired to the same connector. The connector pin-outs are shown in section 5.3. The Power Shelf is fitted with a 25 way D female connector to which the Power Port connects. The Power Port is retained to the Power Shelf by means of the Dsub jack screws. The Power Port is fitted with a 25 way D female connector to allow the Power Shelf connectivity to be extended to a Power Controller using a Power Shelf Interconnect ribbon cable. The Power Controller is powered from the Power Port 24 V supply via pin 7, when connecting CON 2 on the Power Port to the Power Controller.

Circuit Description 

The circuit is split into four functional sections: supply, DC alarms, AC alarms and jumpers. 5.2.1. Supply The 24 V supply is connected to CON3 pins 1 and 6. The supply should be fused close to its source, using a 500 mA F rated fuse. It is nevertheless protected by a non-replaceable fuse on the Power Port. The 24 V is regulated down to 5 V with decoupling provided. The 5 V+ is used to supply the low voltage electronics. The 24 V is used to supply the relays and is connected through CON2 to power the optional Power Controller. 5.2.2. DC Alarms CON1 is the 25 way D male interface to the Power Shelf. The Power Pack and Power Shelf alarm outputs are derived from here. There are two DC alarms per Power Pack: DCFAIL (dc output fail) and OTP (over-temperature protection). The Power Port ORs together DCFAIL and OTP to give one DC fail alarm, via CON 3. If either alarm triggers, the corresponding relay de-energises. Each relay operates a volt-free contact. These are closed when healthy (relay energised) and open in alarm. The contacts share a common return line.

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