Download Low Voltage System Configuration

Low Voltage Power Requirement of TOF FEEs.
• Maximum 110 Watts/tray @ 4.8 Volts @ tray.
• Low Noise:
 Periodic and Random Distortion (PARD) < few mVRMS
• Floating outputs.
• Shielded power cables (optional).
•
•
•
•
•
•
•
Independent supplies/tray.
Regulation: Not critical (linear regulation on FEE cards).
Remotely controlled and monitored.
Safety: Interlocked and adhere to STAR/BNL safety.
Rack mounted
Relatively low cost.
Good efficiency.
Tray Low Voltage System Configuration
Wiener ½ MEH Module
+
-
< 23 Amperes @ 4.8 Volts
(110 watts/tray)
+ sense wire
- sense wire
To Tray
DC power cable 6 AWG
(40 mW )
< 100 feet
Total of 120 MEH pods arranged in 10 PL512
mainframe chassis
+
Wiener 1/2 MEH Module
-
Tray
(load)
STAR magnet
(ground)
< 23 Amperes @ 4.8 Volts
(110 watts/tray)
+ sense wire
- sense wire
To Tray
DC power cable 6 AWG
(40 mW )
< 100 feet
Tray
(load)
STAR magnet
(ground)
LV Electrical Connection Details
Assuming 100 feet cable length and no
other potential drops.
(Note: the cables in the system will be
variable lengths, and less than 100')
Regulated Low Noise, Switching power
Supply With floating outputs
black
(hot)
V  6.63  D
Large ferrite beads
(Optional)
Positive DC wire
High current
crimp lug
connectors
I < 22.92 A
6 AWG cable
V  5.715  D
D
green
(ground)
1K-10K isolation/safety
resistor
Chassis
6 AWG cable
DC return wire
V  0.915  D
Shielded twisted pair with drain wire
(optional: the drain conductor attached to the shield may be grounded
to tray ground without too much noise pickup as long as the 10K
resistor isolates it from ground at the power supply end - to prevent
ground loops)
= Fuse
Interlock and other control signals
not shown
Chassis and magnet ground are
connected via low impedence
paths.
Tray internal connection
(green wire)
All trays are connected to each
other sequentially via the green
wire which connects to magnet
ground.
it is desirable to have each tray
grounded directly
Tray
Vmin  4.8 V
Sense wires
white
(neutral)
+
-
P=110 watts
Magnet Ground
LV power Supply Arrangement in the Full size Racks
40 U
•Total power dissipated by each tray ~ 110 Watts
•Total Power dissipated outside power supply
[53 Watts dissipated in each transmission cable]
(trays + cables) ~ 163 Watts
•Total heat dissipation per ½ MEH module
(assuming 83% efficiency) ~ 34 Watts
•Total Heat Dissipation per power supply
mainframe ~ 408 Watts
•Total heat dissipation per full rack ~2.5 KW
•Available cooling power/rack (3 heat exchangers)
~ 3.6 KW
1U
Empty slot
1U
Ethernet Switch
1U
Air Intake (empty slot)
PL512
3U
1U
Air Intake (empty slot)
1U
FAN Tray
1U
Heat Exchanger
1U
Filter
1U
Air Intake (empty slot)
PL512
3U
1U
Air Intake (empty slot)
PL512
3U
1U
Air Intake (empty slot)
1U
FAN Tray
40U
1U
Heta Exchanger
1U
Filter
1U
Air Intake (empty slot)
PL512
3U
1U
Air Intake
PL512
3U
1U
Max. output power per mainframe chasis: 3 KW
(power factor 0.96; Vmax = 208 V; Imax=15 A)
3U
1U
1U
1U
http://www.wiener-d.com/products/20/73.html
Air Intake
PL512
Air Intake
FAN Tray
Heta Exchanger
1U
Filter
1U
Air Intake (empty slot)
1U
Breaker box
Comparison of Various Power Supply Choices
The estimated costs per channel
do not include rack costs
(if one includes the additional
costs then switching power
supply costs are the lowest)
>24 racks
9 racks
3 racks
Details of Low Voltage Supply Connections
DC power cable 6 AWG
(0.4 W/1000' ) < 23 Amperes @ 4.8 Volts
(110 watts/tray)
~ 80 feet
Wiener PL512
Interlocked
208 Volt AC @ 16 Amp.
½ of one +
MEH
module ½ of one +
MEH
module -
+ sense wire
Ethernet (or CAN)
Control/monitoring
Slow control interface
Tray
(load)
< 23 Amperes @ 4.8 Volts
(110 watts/tray)
+ sense wire
To Tray
- sense wire
STAR magnet
(ground)
Tray
(load)
STAR magnet
(ground)
DC power cable 6 AWG
(0.4 W/1000' )
~ 80 feet
6 MEH modules/PL512
½ of one +
MEH
module ½ of one +
MEH
module -
To Tray
- sense wire
Cable lengths vary:
80’ -100’
DC power cable 6 AWG
(0.4 W/1000' ) < 23 Amperes @ 4.8 Volts
(110 watts/tray)
~ 80 feet
+ sense wire
To Tray
- sense wire
Tray
(load)
< 23 Amperes @ 4.8 Volts
(110 watts/tray)
+ sense wire
To Tray
- sense wire
DC power cable 6 AWG
(0.4 W/1000' )
~ 80 feet
Wiener PL512 based low voltage power supply
system for TINO based TOF FEE.
(only one out of 10 units shown)
STAR magnet
(ground)
Tray
(load)
STAR magnet
(ground)
Power Supply Noise Characteristics
Load: 100 A @ 5 Volts
Comparison of Noise Rates in TOF5:
Linear Supply vs. Wiener PL508
TOF System Resolution from Off-Line Analaysis
Kepco Linear (red curve) vs. Wiener (blue curve)
(March 2005 Cu-Cu)
Slow Control for the TOF Low Voltage System
Local Ethernet Segment
Ethernet
Ethernet
switch
PL512
STAR
Slow CTRL
Data
Stream
This figure shows tray power supplies only. There is
an additional power supply mainframe for the Start
detector FEEs and TDIG boards (and a few spares).
6 PL512 mainframes
Block Diagram of
TOF Low Voltage
Control System
6 PL512 mainframes
EPICS
Based
Slow
CTRL
TOF High Voltage System Requirements.
• High Voltage to provide symmetric HV up to +/- 7.5 KV @ few
uA/tray (this current takes into account Beam on condition scaled to
RHIC upgrade luminosities).
• Remote programability/monitoring: Voltage, current limits, ramping
rates, voltage and current monitoring (10 nA resolution).
• Isolation: power supply outputs must be floating. Furthermore, since
one set of plus and minus outputs supply current for up to 10 trays
tray inputs are isolated from other trauys to avoid interference.
• HV will be interfaced to STAR interlock system.
• Remote control software will be based on EPICS (or LabView) and
will be interfaced to STAR controls (logging and alarms).
Choice of HV Power Supply.
•
CAEN SY127 mainframe with A631 pods has been used to supply HV to MRPCs
(some problems have been encountered during last two runs - failed A631
modules).
•
Each SY127 accommodates 10 A631 pods. Each A631 pod (negative and positive
output versions available) supplies 4 independent floating channels. Each output
could supply up to 8 KV at 100 uA. (One fully equipped SY127 would serve the
entire TOF system). Output current limited internally and also by external limiting
resistors located @ distribution boxes.
•
Distribution boxes located on the magnet will fan out each pair of + and – HV to
up to 10 trays. These boxes will supply required isolation, filtering, current limiting
and grounding of the HV (see figure on the next page).
•
CPE Italia SPA (rated ~20 KV) cables (HV RG-58) will be used for HV distribution.
These cables have been flame tested by Phenix Collaboration.
•
Kings (or Reynolds equivalent) ) 1065 series 10 KV (DC tested to 25 KV) will be
used to interface the HV to power supplies, distribution boxes, and the trays. (The
new Reynolds equivalent connectors are rated at 15 KV @ approximately the
same cost).
•
Remote control and monitoring of the SY127 will be done through CAENET (PC
based A1303 PCI-HS CAENET controller already used to control HV system in
the past few years).
High Voltage System
CAEN SY127 HV Supply Chassis
[one of two required units shown]
Interlock
High Voltage Distribution Box
(1 of 12 units shown)
I max  100  A
“small value”
tray ground isolation resistors
(optional)
Neg. Ch, 1
HV Coax Cable
Pos. Ch, 6
Ityp  1  A
To one TOF tray
Negative HV Coax Cable
Pos. Ch. 1
I max  100  A
Only one pair of total
of 10 pairs shown
Positive HV Coax Cable
Magnet
Ground
6 cables
3 A631N, -8KV
modules
(including spares)
12 indep., floating
channels
Up to 100 uA
per channel
Neg. Ch. 6
6 cables
CAEN NET bus
3 A631P, +8KV
modules
(including spares)
12 indep., floating
channels
Up to 100 uA
per channel
HV Coax Cable
Current limiting and filtering HV resistors
(10 M ~ 100 M)
LabView GUI for SMD TCP/IP-based HV Control Program for
CAEN SY1527 Mainframe Developed by UCLA.
Arrangement of Supplies in Half Height Racks.
25 U
25 U
2U
Empty slot
3U
25 U
Empty slot
4U
3U
1U
Fan Tray
1U
Heat Exchanger
1U
Air Filter
1U
Air Intake (panel only)
5U
4U
1U
Air Intake (panel only)
3U
5U
1U
Air Intake (panel only)
1U
Fan Tray
1U
Heat Exchanger
1U
Air Filter
1U
Air Intake (empty slot)
25 U
25 U
1U
3U
1U
25 U
4U
Air Intake (panel only)
Air Intake (empty slot)
5U
4U
3U
1U
Fan Tray
1U
Fan Tray
1U
Fan Tray
1U
Heat Exchanger
1U
Heat Exchanger
1U
Heat Exchanger
1U
Air Filter
1U
Air Filter
1U
Air Filter
1U
Air Intake (empty slot)
1U
Air Intake (empty slot)
1U
Air Intake (empty slot)
1U
Interlock/Com. Unit
1U
Interlock/Com. Unit
1U
Interlock/Com. Unit
Linear Regulated Supplies
Ferroresonant power supply
Wiener power supply
Total of 30 racks required
Total of 8 racks required
Total of 3 racks required