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Low Voltage LB status. RPC detector and trigger group. Low Voltage Link Board status. After many failures in the link board system the RPC-Trigger community decided to investigate all the possible causes analyzing not only the LB system but also the LV system : A3016 boards MAO

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Presentation Transcript
Low voltage lb status

Low Voltage LB status

RPC detector and trigger group



Low voltage link board status
Low Voltage Link Board status

  • After many failures in the link board system the RPC-Trigger community decided to investigate all the possible causes analyzing not only the LB system but also the LV system:

    • A3016 boards

    • MAO

    • LV and MAO power cut and power cycle

    • Power off and on of the link box

    • CAEN firmware

Pigi Paolucci - CMS LV review



Lv link board schema
LV link board Schema

SY1527

  • MAO 48 service from BC

    • Output current = 15-18 A

  • EASY 3000 – Joint 48 Power & Service

  • Output power from A3016:

    • 2.5 Volts / 5.0 Amp

    • 3.5 Volts / 10.0 Amp

3-phase

48 service

MAO

48 power

48 service

EASY

A3016

Link Box

Pigi Paolucci - CMS LV review


What powering off the mao in the proper ways
What powering OFF the MAO in the proper ways ?

  • Powering OFF the MAO via SY1527 or using the interlock placed on the front

OK

Pigi Paolucci - CMS LV review


What powering off the easy in a bad way
What powering OFF the EASY in a “bad” way ?

  • Powering OFF the EASY 3000 crate removing the power or service connector from the back

OK

Pigi Paolucci - CMS LV review


What cutting the mao 3 phase
What cutting the MAO 3-phase ?

  • Shutting-down the MAO cutting 3-phase

  • oscillation does not depend from the MAO load (from 4 A to 18 A)

  • sometimes 2 oscillations in few msec

  • oscillation disappear separating the 48 power from the 48 service

  • No other ways to reproduce it

NOT OK

Pigi Paolucci - CMS LV review


What happen cutting mao 3 phase
What happen cutting MAO 3-phase ?

  • MAO goes OFF in 2 steps: from 48 to 22 V and a from 22 to 0 V

  • The A3016 channels go off when MAO voltage is around 22 V and this takes about 250-300 msec (fixed load on the MAO)

  • Around 22 V the boards begin to work not properly (Vcc goes from 12 V to 6 V) and generates oscillations on Vout.

Vcc = 12 V

Vmao = 22 V

6 V

Pigi Paolucci - CMS LV review

7/6/10

Pigi Paolucci - INFN

9



Low voltage lb status

  • At T0:

  • Turn off the 3-phase switch

  • MAO starts ramping down with a “dummy load” - NO status changing

  • After a while, it gives UNV status, but the channel keeps status ON.

  • At T1:

  • MAO ramps down with different slope (real load)

  • At T2:

  • MAO swiched ON (600 ms from T0).

  • Switching OFF-ON in <1sec, no IntFailstatus is generated by the MAO and the channel goes back to the 48V without any alarm acknowledge.

Scope output

40 V

MAO

A3016

T0

T1

T2

Pigi Paolucci - CMS LV review


What we have done
What we have done !

Already implemented Solutions:

  • Introducing a big capacitor (33 mF) between the service and power line of the EASY

  • Improve the A3016 firmware

  • Modify the MAO firmware

    Long Term Solutions:

  • Designing a protection on the Link Box LV lines (see tomorrow meeting)

  • Separating the 48 service and power of the EASY ?

OK

Under test now

Under test now

Pigi Paolucci - CMS LV review


A3016 firmware requirements
A3016 firmwarerequirements

  • Couple of channels in tracking mode (ON/OFF/Trip at same time and with one command).

    • delay between the 2 channels must be less than 1 msec

  • Ramping up in stepping mode:

    • overshoot first steps < 10% of the setting voltage

    • overshoot of the last step must be < setting voltage

    • voltage must be always < setting voltage (no overshoot above max value)

    • Over-voltages are very dangerous for the LB.

    • no under-voltage dips are allowed after VCC2.5 gets above 2.0 V

    • no under-voltage dips are allowed after VCC3.3 gets above 1.2 V

    • total time to reach the setting voltages (3.5 V and 2.5 V) should be less than 60 msec

Pigi Paolucci - CMS LV review


Mao firmware requirements
MAO firmware requirements

  • The MAO behavior is case of glitch on the 3-phase line is potentially dangerous for the LV system.

  • Turn OFF the MAO when the Vmon < 43-40 Volts in about 100 msecand require an acknowledge afterwards to bring the channel back to ON.

    • In 100 msec firmware measures the voltage 5 times, should be enough.

    • After 100 msec the MAO voltage is around 35-38 V and it is enough to shut-down properly the A3016.

Pigi Paolucci - CMS LV review


Low voltage lb status

New MOA firmware

New MAO firmware

MAO

43V

200 msec

OFF – 38V

Vcc

Oscillations on both Vcc

and Vout

Vout

old MAO firmware

Pigi Paolucci - CMS LV review


Low voltage lb status

Rumping up - new A3016 firmware

No overshot over the max voltage

3.5 V

2.5 V

50 msec

80 msec

Pigi Paolucci - CMS LV review


Low voltage lb status

Overshot - new A3016 firmware

Overshot < 10-15% voltage set

Pigi Paolucci - CMS LV review


Low voltage lb status

Channels delay- new A3016 firmware

Delay stable and < 2 msec (depends on the charge)

2 msec

Pigi Paolucci - CMS LV review


Results with c and diode
Results with C and diode

service

power

1.5 sec

Pigi Paolucci - CMS LV review


Results with c and diode1
Results with C and diode

No spikes or oscillations

48 V

600 msec

2.5 V

Pigi Paolucci - CMS LV review


Conclusions
Conclusions

  • Capacitor protection is working safe

  • New firmwaresare ready and under test at CAEN.

  • Next week will be tested at 904

  • Both Capacitor boxes and firmwares have been payed by INFN (M&O-B 2010)  16 Keuro

  • Hardware protection of the Link Box is in any case necessary

Pigi Paolucci - CMS LV review