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9.3.4 System Interface
The system interface is for control external devices. The system interface cable is between
generator and the coupling network. The
“System in” connector of the CDN 3153-S63.1 need
a link to the
“Master controller” NSG 3150 generator. The system cable is part of the delivery.
Otherwise the interlock terminator must be connected at the CDN 3153-S63.1 System
interface out plug and the screws need to be tightened. The interface terminator plug is part
of the generator.
9.3.5 Fan and cooling concept
The CDN 3153-S63.1 have been designed with a dynamic cooling concept. Internal elements
suspected to warm up in any condition, especially the Surge pulse decoupling chokes, are
equipped with thermal sensors. So at standby or for lower EUT currents, when there are
nearly no dissipation losses in the CDN, and so no heat generation, there is no need of
cooling and the fans will turn at a very low speed, generating no noise. There must be
sufficient free space (< 20 cm) around the device for the cooling air.
As soon as the EUT current raises, heat will be generated in the housing, the internal control
electronics will detect this and increase fan speed to improve cooling.
In case of internal or external overloading, there will be a point where even full speed cooling
will no more be sufficient, at this moment the CDN 3153-S63.1 will switch OFF EUT power
through the built in EUT power contractor, and so avoid destruction of the instrument (risk of
fire). The CDN 3153-S63.1 control electrics will also send a message back to the NSG 3150
which will immediately stop the firing of pulses.
That way CDN 3153-S63.1 series give large overload capabilities, allowing up to 1,5 nominal
current loading for 10 minutes, as well as high inrush currents or peak laods.