Transcript Final Production Revision

Final Production Revision
DECam Heater Controller System
October 13, 2009
Mark Kozlovsky
1
Final Production Revision
1. HEATER DRIVER BOARD
a) Control signals for overheating LEDs were reversed so LEDs were ON
all the time. Correction Action: inverters are added in front of optocouplers.
b) LED power switch which allows for disconnecting LEDs during normal
operation had wrong footprint and could not be installed. Correction
Action: library part and footprint for the switch were corrected.
c) A screw that holds telemetry connector was very close to +15V_Heater
via and sometimes top layer will wear away causing a short.
Correction Action: PCB layout is changed to prevent the occurance.
d) Shutdown signals for hot swap controllers were impossible to use and
monitor because of crate construction limitations. Correction Action:
Signals were brought from transition boards to the Heater Driver
Boards to be transferred through additional isolation buffers to the
telemetry connectors and further to a Slow Control Subsystem
October 13, 2009
Mark Kozlovsky
2
Final Production Revision
Telemetry Connector
Pin
October 13, 2009
Connection
1
Input Test1
2
Out Test 1+
3
Out Test 1-
4
Input Test 2
5
Out Test 2+
6
Out Test 2-
7
GND_Control
8
GND_Control
9
Overheat 1+
10
Overheat 1-
11
Overheat 2+
12
Overheat 2-
13
nShutDown
14
Aux_Test
15
GND_Control
Mark Kozlovsky
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Final Production Revision
2.
HEATER DRIVER BOARD TRANSITION BOARD
a) Value of the resistor R42 was a little bit too small to drive nShutdown
signal to log “0” (< 0.8V). Correction Action: Value of Resistor R42 is
changed from 3.74K to 4.32K
b) The Hot Swap Controller will sometimes shut itself down because of
the inrush current on its negative supply. The setting for the controller
shutdown is 4.17A. Correction Action: Value of capacitor BP1 is
changed from 0.01uF to 0.047uF in order to limit slew rate for the
negative output.
c) Input connector Adam Tech Fully Shielded Mini DIN 8-position Jack
had wrong footprint and could not be installed. Correction Action:
library part and footprint for the connector were corrected.
d) nShutdown signal was not connected to the Slow Controller Board
due to crate construction limitations. Correction Action: nShutdown
signal is connected to +5V on J9 in order to be monitored as regular
power supply via Analog Power Backplane.
October 13, 2009
Mark Kozlovsky
4
Final Production Revision
3.
a)
b)
HEATER PATCH PANEL BOARD
The front panel has to be machined around Control input and Heater
output connectors to allow plug-in cables to be fully connected. Correction
Action: Front panel drawing is changed accordingly
The Control input connector has wrong pin assignments on the main
schematic. Correction Action: Pin assignments are change according to
the Table 1.
October 13, 2009
Mark Kozlovsky
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Final Production Revision
Table 1.
October 13, 2009
Pin
Number
Incorrect Signal
Name
Correct Signal
Name
A2
Control_input_12
Control_input_2
A3
Control_input_11
Control_input_1
A5
Control_input_8
Control_input_3
A6
Control_input_7
Control_input_4
A8
Control_input_4
Control_input_5
A9
Control_input_3
Control_input_6
A11
Control_input_2
Control_input_7
A12
Control_input_1
Control_input_8
A16
Control_input_10
Control_input_9
A17
Control_input_9
Control_input_10
A19
Control_input_6
Control_input_11
A20
Control_input_5
Control_input_12
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Filter Frequency Response
4.
HEATER PATCH PANEL TRANSITION BOARD
a) Input connector Adam Tech Fully Shielded Mini DIN 8-position Jack,
had wrong footprint. Correction Action: library part and footprint for the
connector were corrected.
October 13, 2009
Mark Kozlovsky
7