performance tests and control for the trd-hv a. markouizos, a. petridis, s. potirakis, m. tsilis, m....
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Performance Tests and Control for the TRD-HV
A. Markouizos, A. Petridis, S. Potirakis, M. Tsilis, M. Vassiliou
Athens University
ALICE DCS Workshop CERN March 2006
Requirements of the TRD-HVDS
A Master/Slave HV distribution system will deliver the required voltages to the TRD readout chambers:
Drift HV: 540 ch. ~ -2.5 kV 170μA/ch (max) ΔI ~ 40nA/ch
Anode HV: 540 ch. ~ +1.7 kV 7 μΑ/ch (max) ΔI ~ 2nA/ch
Stability test in the Lab with resistor loads 36 hours of operation for 6 channels
dN/dV distributions for the last 4 hours
after 72 hours of operation
Perfomance test in Heildeberg HV card connected with TRD stack
(18 hours of operation)Voltage in ADC units vs Time
Reference channel with 500Mohm
Embedded Software Status:
Main Structure of Software is completed
Improvements
Optimize the performance
Decrease the response time
Increase Accuracy
Ensure Stability
Module 2Module 1
Crate 4
Module 0
Crate 5
Module 2Module 1Module 0
Crate 3
Module 2Module 1Module 0
Crate 2
Module 2Module 1Module 0
Crate 1
Module 2Module 1Module 0
Module 2Module 1Module 0
Crate 0
Rack 0
Module 2Module 1
Crate 4
Module 0
Crate 5
Module 2Module 1Module 0
Crate 3
Module 2Module 1Module 0
Crate 2
Module 2Module 1Module 0
Crate 1
Module 2Module 1Module 0
Module 2Module 1Module 0
Crate 0
Rack 1
Module 2Module 1Module 0
Crate 0
Concept of connecting the
High Voltage Distribution System to DCS-Bord• Layout of a Rack:
• Layout of a Crate:
• Layout of a Module:
Card 4
Channel 5Channel 4Channel 3Channel 2Channel 1Channel 0
Card 3
Channel 5Channel 4Channel 3Channel 2Channel 1Channel 0
Card 2
Channel 5Channel 4Channel 3Channel 2Channel 1Channel 0
Card 1
Channel 5Channel 4Channel 3Channel 2Channel 1Channel 0
Channel 5Channel 4Channel 3Channel 2Channel 1Channel 0
Card 0 TRD Stack
TRD Supermodule
DCS Board 0 Crate 0
DCS Board 1(Optional)
Module 2(Internal architecture similar to module 0)
Crate 1
(Internal architecture similar to crate 0)
Module 0Card 0
Card 1
Card 2
Card 3
Card 4
Module 1(Internal architecture similar to module 0)
• Architecture of the CAN network inside one rack:
Control Parameters
RAMPING
Error Messages
• Voltage Errors Over Voltage
message: max allowed voltage is exceeded action: voltage is set to the max allowed value
Under Voltage message: min allowed voltage is out of range action: voltage is set to the max allowed value
Limits Error message: set value is out of limits action: limit is set to the default value
• Current Errors (Hardware Error) Over Current
alarm: max allowed current is exceeded or a short-circuit occurred
• Ramping Errors Ramping Rate
message: max allowed rate is exceeded action: rate is set to the max allowed value
Ramping End Value message: end value is out of limits Action: value is set to the max allowed
Limits Error message: set value is out of limits action: limit is set to the default value
Emergency Ramp Down Procedure: This is a special function that ramps down the channel but the rate may be different from the set one. (We suppose that the voltage measurement system is out of order)
Control error on Current measurementActivate the emergency ramp downRamp down and switch off the channel, or ignore.
Due to three (or more) successive comm. errors the channel current Measure is halted. This affects Current Measurement, Over-Current Functions.
ISO ADC communication failed
304
Communication error
in Current measurement System
No action. Channel must be inspected
Warning: Communication error detected in current measurement system. The warning appears for the first and second time this error occurs.
Error in ISO ADC communication detected
303
Control error on Voltage measurement
Activate the emergency ramp down
Emergency Ramp-Down Procedure may be activated. Channel has to be switched off.
Due to three (or more) successive comm. errors the channel voltage control is halted. This affects Voltage Measurement, Over-Voltage, Ramp Functions.
Voltage ADC communication failed
302
Communication error
in Voltage measurement System
No action. Channel must be inspected
Warning: Communication error detected in voltage measurement system. The warning appears for the first and second time this error occurs.
Error in Voltage ADC communication detected
301
PVSS MsgUser Actions
DescriptionTechnical InfoError No
Error Messages (Hardware Errors)
General Communication Error(error #)Card has to be inspected
From this error # the error messages are related with SJA1000 (can controller ) hardware errors. Multiple errors in a short period of time, may be a sign of future loss of the card.
SJA1000 (Can Controller) Errors
308
Channel out of order
No action. Actions should have been taken during the previous events
Due to previous events the control of the channel is halted
Hardware Error on channel
307
Voltage can not be increased to the desired value
Ramp down channel, and then switch it off
Voltage Value has reached the highest hardware possible value. This occurs due to either wrong voltage set or error in voltage control system
Min Voltage DAC Value exceeded
306
Voltage can not be reduced to the desired value
Ramp down channel, and then switch it off
Voltage Value has reached the lowest hardware possible value . This occurs due to either wrong voltage set or error in voltage control system
Max Voltage DAC Value exceeded
305
PVSS MsgUser Actions
DescriptionTechnical InfoError No