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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

slide11

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

slide15

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

slide16

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

slide17

Overshot - new A3016 firmware

Overshot < 10-15% voltage set

Pigi Paolucci - CMS LV review

slide18

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

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