Category: Converter Manual Article
-
MCB faults
This article concerns the Schneider NSX 100 circuit breaker used in Sirius. In Sirius we have only connected the SD contact which indicates ANY kind of trip – even one coming from the undervoltage coil. This is why we always have the fault MCB. MCB origin Cause State card DIM Fault Label SKMCB pin15 to
-
FGC stack in synchronisation mode
This happens when one of the post-mortem services is not available and hence the FGC3 remains in post-mortem generation mode. You can reset this by typing the following command:
-
Play RAMP function
To play a ramp function on user 2, once every 04 cycles (period 4.8s) load the following configuration file:
-
FGC3 block diagram
The FGC3 regulators are described in the FGC Yellow pages http://proj-fgc.web.cern.ch/proj-fgc/gendoc/def/PropertyREG.htm#REG.I Current regulation diagram pdf Voltage regulation diagram pdf
-
Kill a linux script
When running an automatic parameter identification script (using FGCRun+ menus) the script may not be properly terminated and the converter keeps turning on and off by itself. To force stop these scripts that run on the cs-ccr-teepc2 linux machine on technical network you need to connect to cs-ccr-teepc2 using a terminal (such as putty) and
-
REF.CYC.STATUS gives PRE_FUNC_WRN
The pre-function error (in seconds) is given using the G REF.CYC.PRE_FUNC_ERR(#usr). This value returns the difference between a theoretical pre-function time and the actual pre-function the fgc managed to play in the time available. The theoretical value is calculated by adding the calculated times of ramping up, the duration of the MAGCYCLE plateau (REF.DEFAULTS.PLATEAU_DUR[0]), any
-
Current loop properties
This property contains the period for the operational current regulation algorithm. With 10 it means a sampling rate of 1kHz which is normally fine for our application and that Auxpole 1 and 2 could reach a value of 100Hz. This property contains the pure delay in iterations between the calculation of the actuation by the
-
Tunning loops with low inductive load
When the circuit inductance is very low (1.4mH in this example). If identification was made with PowerSpy to calculate the differential inductance Ld = (Vmag- rmag x Imag)/(di_dt), with a very low inductance the accuracy of the calculation for Ld is a function of how accurate the measurement of rmag was made in DC (at
-
Play a PULSE function
A slow ramp to IOP,max can be used to obtain the converter inductance with respect to current.
-
Synchronisation with Database
The FGC configuration is stored in the Configuration Database that is maintened by the CCS section. Each time the converter electronics boot they download the latest saved configuration. Useful commands