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S30XL-LESA/LDMX
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Check dry air is flowing, and all interlock inputs are plugged in. Both chillers and MPOD should be powered but not running. Interlock board should be off.
Start Test MPOD interlock: With the interlock board still off, start EPICS controls . Verify and verify that MPOD channels cannot be turned on with the interlock board off.
Setup SVT chiller: Set SVT chiller setpoint using its touchscreen. When done, switch to remote RS-232 control (Menu->Connect Unit->Remote control). Verify watchdog is enabled (Menu->Connect Unit->Digital Interfaces).
Setup FEB chiller: Start FEB chiller and adjust setpoint, then stop the chiller.
Turn on the interlock board. : Green LED should turn on immediately; MPOD trip LED (third from top) should clear as chillers start. The other LEDs should stay off.
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There is no way to tell the interlocks have been disabled without testing the trip, or running MUSEcontrol. Do not leave the MPOD in this state.
Reset interlocks on the MPOD
ppa-pc91245:mpod_scripts/clear_interlock.sh
#!/bin/bash
for j in `seq 5 8`;do for i in `seq -w 00 15` ; do snmpset -v2c -m +WIENER-CRATE-MIB -c guru ppa-mpod1 outputSwitch.u$j$i i 10 ; done;done
Shutdown
Stop the Arduino monitor script on hpstracker (this is not necessary if you don't mind it sending alarm tweets).
Take the SVT chiller off of remote control (Menu->Connect unit->Remote control). Check the setpoint and make sure it's what you want.
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| Command | description |
|---|---|
| FSO1 | send "SO1" to FEB chiller - start chiller |
| FSS20.0 | send SS20.0 to FEB chiller - set setpoint to 20.0 C |
| Sout_mode_05 1 | send "out_mode_05 1" to SVT chiller - start chiller |
| T20.0 | set SVT chiller setpoint to 20.0 C |
Quit Minicom and start the monitor script.
Programming the interlock board
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| name | description | source | units | nominal value |
|---|---|---|---|---|
| T | air temp in SVT box | dry air sensor | C | between SVT and room temps |
| RH | relative humidity in SVT box | dry air sensor | % | near or below 0 |
| dew | dewpoint in SVT box | dry air sensor | C | -50 or below |
| fl | flow switch state | flow switch | boolean | 0 (flow above setpoint) |
| fS | FEB chiller serial link | serial port | boolean | 1 (OK) |
| sS | SVT chiller serial link | serial port | boolean | 1 (OK) |
| fT | FEB chiller temp | FEB chiller serial link | C | setpoint +/- 0.1 |
| fSP | FEB chiller setpoint | FEB chiller serial link | C | 20 - 30 |
| fFl | FEB chiller flow | FEB chiller serial link | gpm | 0.30 - 1.0 (this flow meter is not very reliable) |
| fF | FEB chiller fault code | FEB chiller serial link | 0 (no errors) | |
| sC | SVT chiller state | SVT chiller serial link | boolean | 1 (running) |
| sT | SVT chiller temp | SVT chiller serial link | C | setpoint +/- 0.2 |
| sSP | SVT chiller setpoint | SVT chiller serial link | C | -20 - 20 |
| sPw | SVT chiller power | SVT chiller serial link | % full power | 15 - 30 |
| sP | SVT chiller pressure | SVT chiller serial link | bar | 1.5 - 2.0 |
| io1 | BNC input voltage 1 | BNC jack | V | 0 - 5.0 |
Alarms
| Alarm in | Alarm cleared | Cause | MPOD trip? |
|---|---|---|---|
| Alarm: flow switch trip | Event: flow switch cleared | Flow at FEB chiller return below setpoint (~15 GPH), or switch unplugged | yes |
| Alarm: dewpoint trip | Event: dewpoint trip cleared | dewpoint above -10 C, or sensor unplugged | no |
| Alarm: SVT chiller stopped | Event: SVT chiller running | SVT chiller responds with "0" (not running) to "in_mode_05" | yes |
| Alarm: SVT serial bad | Event: SVT serial OK | no response, or unparseable response, to last 5 messages | yes |
| Alarm: FEB serial bad | Event: FEB serial OK | no response, or unparseable response, to last 5 messages | no |
Failure analysis
FEB chiller shutdown (overtemp, power loss)
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