Electrical Power System (CSM) - Revision history

imported>Meik at 17:47, 19 February 2009

2009-02-19T17:47:03Z

imported>Tschachim at 18:14, 16 December 2006

2006-12-16T18:14:27Z

← Older revision		Revision as of 18:14, 16 December 2006
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	== Fuel cell radiator emergency bypass ==		== Fuel cell radiator emergency bypass ==

	~~{{Attention \| message=Because~~ of ~~the work-in-progress~~ of the ~~EPS this procedure is not working at~~ the ~~moment~~.}}		During normal operations no fuel cell emergency bypass is necessary. But if only one fuel cell is running at a load of about 20 A, some of the radiators need to bypassed so that the coolant temperature doesn't become too low.

	~~During normal operations no fuel cell emergency bypass is necessary. But if only one fuel cell is running at a load of about 20 A, you have~~ to ~~bypass some of the radiators so that the coolant temperature is not too low~~.		* To maintain power supply during this test switch both MAIN BUS TIE switches to on (up).

	* ~~Switch to time acceleration 100.~~ Switch the FUEL CELL INDICATOR to position 1. Make sure that the FC REACS VALVES switch is in NORM position. Switch the FUEL CELL REACTANTS 2 and 3 switches to OFF (down position)~~. The~~ FUEL CELL REACTANTS 2 and 3 indicators change to striped-line indication.		* Switch the FUEL CELL INDICATOR to position 1. Make sure that the FC REACS VALVES switch is in NORM position. Switch the FUEL CELL REACTANTS 2 and 3 switches to OFF (down position), the FUEL CELL REACTANTS 2 and 3 indicators change to striped-line indication. The FC BUS DISCONNECT alarm is triggered, push the MASTER ALARM pushbutton/light to turn off the alarm.

	* Wait ~~some time~~ (use time acceleration 1000, if you are impatient~~...~~), then the FC RAD TEMP LOW indicator changes to striped-line indicating a coolant temperature below -30°F.		* Wait about 20 minutes (use time acceleration 100 to 1000, if you are impatient), then the FC RAD TEMP LOW indicator changes to striped-line indicating a coolant temperature below -30°F. The FC 1/2/3 alarms are triggered because of that, push the MASTER ALARM pushbutton again.

	* Switch the FUEL CELL RADIATORS 1 switch to EMER BYPASS (down position). The switch is spring-loaded and flips back to to center position. The FUEL CELL RADIATORS 1 indicator changes to striped-line indication. After a ~~short time~~ the FC RAD TEMP LOW indicator changes back to gray indicating a normal coolant temperature. You are now in "emergency mode".		* Switch the FUEL CELL RADIATORS 1 switch to EMER BYPASS (down position). The switch is spring-loaded and flips back to to center position. The FUEL CELL RADIATORS 1 indicator changes to striped-line indication. After a few minutes the FC RAD TEMP LOW indicator changes back to gray indicating a normal coolant temperature, the FC 1 alarm is turned off. You are now in "emergency mode".

	* Monitor fuel cell 2 and 3 by switching the FUEL CELL INDICATOR to position 2 and 3. The flows are 0 lb/hr of course and the FC RAD TEMP LOW indicator shows striped-line indication because the radiators of the other fuel cells are not bypassed. Switch the FUEL CELL INDICATOR back to position 1.		* Monitor fuel cell 2 and 3 by switching the FUEL CELL INDICATOR to position 2 and 3. The flows are 0 lb/hr of course and the FC RAD TEMP LOW indicator shows striped-line indication because the radiators of the other fuel cells are not bypassed. Switch the FUEL CELL INDICATOR back to position 1.

	* Switch the FUEL CELL ~~RADIATORS 1 switch~~ to ~~NORMAL~~ (up position). ~~Switch~~ the ~~FUEL CELL REACTANTS~~ 2 and 3 switches to ON (up position). You are now back in "normal mode". The FC RAD TEMP LOW indicator should show gray indication again.		* Switch the FUEL CELL REACTANTS 2 and 3 switches to ON (up position). Reconnect the fuel cells to the busses by switching FC MNA 2 and FC MNB 3 to up, the FC DISCONNECT alarm is turned off. Disconnect the batteries by switching both MAIN BUS TIE switches to OFF. After a few minutes the FC 2/3 lights are turned off, the coolant temperatures are fine again.

			* Switch the FUEL CELL RADIATORS 1 switch to NORMAL (up position). You are now back in "normal mode". The FC RAD TEMP LOW indicator should show gray indication again.

	<biblio force=false>		<biblio force=false>

imported>Tschachim at 17:43, 16 December 2006

2006-12-16T17:43:19Z

← Older revision		Revision as of 17:43, 16 December 2006
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	== Fuel cell shutdown and restart ==		== Fuel cell shutdown and restart ==

	During normal operations all fuel cells are running and have a load of about 20 A ~~at the moment~~. Unlike in reality the fuel cells can be shut down and restarted at any time.		During normal operations all fuel cells are running and have a load of about 20 A. Fuel cell 1 and 2 are connected to main bus A, fuel cell 3 to main bus B. Unlike in reality the fuel cells can be shut down and restarted at any time, so let's do that with fuel cell 1.

	* Switch the FUEL CELL INDICATOR to position 1. You can monitor a hydrogen and oxygen flow above 0 lb/hr on the FUEL CELL FLOW H<sub>2</sub>/O<sub>2</sub> meters and a FUEL CELL MODULE SKIN TEMP of above 400 °F.		* Switch the FUEL CELL INDICATOR to position 1. You can monitor a hydrogen and oxygen flow above 0 lb/hr on the FUEL CELL FLOW H<sub>2</sub>/O<sub>2</sub> meters and a FUEL CELL MODULE SKIN TEMP of above 400 °F.
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	* Make sure that the FC REACS VALVES switch is in NORM position, otherwise you cannot operate the fuel cell reactants valves. Switch the FUEL CELL REACTANTS 1 switch to OFF (down position). The switch is spring-loaded and flips back to to center position.		* Make sure that the FC REACS VALVES switch is in NORM position, otherwise you cannot operate the fuel cell reactants valves. Switch the FUEL CELL REACTANTS 1 switch to OFF (down position). The switch is spring-loaded and flips back to to center position.

	* The FC BUS DISCONNECT alarm is triggered, because fuel cell 1 is disconnected from main bus A. Push the MASTER ALARM pushbutton/light to turn off the alarm ~~and switch~~ the FC MNA 1 switch to OFF.		* The FC BUS DISCONNECT alarm is triggered, because fuel cell 1 is disconnected from main bus A. The FC MNA 1 indicator changes to striped-line indication. Push the MASTER ALARM pushbutton/light to turn off the alarm. Switch the FC MNA 1 switch to OFF to turn off the FC BUS DISCONNECT light.

	* Now fuel cell 1 is down, the FUEL CELL REACTANTS 1 indicator changes to striped-line indication, both flows are 0 lb/hr, but the fuel cell skin temperature remains almost unchanged because the fuel cell temperature is still maintained by the fuel cell heaters.		* Now fuel cell 1 is down, the FUEL CELL REACTANTS 1 indicator changes to striped-line indication, both flows are 0 lb/hr, but the fuel cell skin temperature remains almost unchanged because the fuel cell temperature is still maintained by the fuel cell heaters.

	* Switch the FUEL CELL HEATERS 1 switch to OFF (down position). The fuel cell skin (and condenser exhaust) temperature decreases slowly. The FC 1 alarm is triggered when the fuel cell temperatures get too low, push the MASTER ALARM pushbutton again. Wait until it drops below 300 °F (use time acceleration 100 to 1000, if you are impatient).		* Switch the FUEL CELL HEATERS 1 switch to OFF (down position). The fuel cell skin (and condenser exhaust) temperature decreases slowly. The FC 1 alarm is triggered when the fuel cell temperatures get too low, push the MASTER ALARM pushbutton again. Wait until the skin temperature drops below 300 °F (use time acceleration 100 to 1000, if you are impatient).

	* Switch the FUEL CELL REACTANTS 1 switch to ON (up position). Unfortunatly the fuel cell does not start, because the skin temperature is below 300 °F.		* Switch the FUEL CELL REACTANTS 1 switch to ON (up position). Unfortunatly the fuel cell does not start, because the skin temperature is below 300 °F.

	* Switch the FUEL CELL HEATERS 1 switch to up position. The fuel cell skin temperature increases slowly (use time acceleration about 100 again). After 300 °F is reached, again switch the FUEL CELL REACTANTS 1 switch to ON (up position). The fuel cell turns on, ~~the flows are normal again and~~ the skin temperature increases quickly to the old value. The fuel cell is running normally again.		* Switch the FUEL CELL HEATERS 1 switch to up position. The fuel cell skin temperature increases slowly (use time acceleration about 100 again). After 300 °F is reached, again switch the FUEL CELL REACTANTS 1 switch to ON (up position). The fuel cell turns on, the skin temperature increases quickly to the old value and the FC 1 alarm is turned off.

			* Switch the FC MNA 1 switch to up to connect fuel cell 1 to main bus A again, the switch is spring-loaded and flips back to to center position. The FC MNA 1 indicator changes to gray indication, the flows are increasing and the fuel cell is running normally again.

	== Fuel cell radiator emergency bypass ==		== Fuel cell radiator emergency bypass ==

imported>Tschachim: /* Fuel cell shutdown and restart */ fixed procedure

2006-12-10T00:00:43Z

Fuel cell shutdown and restart: fixed procedure

← Older revision		Revision as of 00:00, 10 December 2006
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	== Fuel cell shutdown and restart ==		== Fuel cell shutdown and restart ==

	~~{{Attention \| message=Because~~ of the ~~work-~~in~~-progress of~~ the ~~EPS this procedure is not working~~ at ~~the moment~~.}}		During normal operations all fuel cells are running and have a load of about 20 A at the moment. Unlike in reality the fuel cells can be shut down and restarted at any time.

	~~During normal operations all fuel cells are running and have a load of about 20 A at~~ the ~~moment~~. ~~Unlike in reality we~~ can ~~shutdown~~ and ~~restart~~ the ~~fuel cells at any time~~.		* Switch the FUEL CELL INDICATOR to position 1. You can monitor a hydrogen and oxygen flow above 0 lb/hr on the FUEL CELL FLOW H<sub>2</sub>/O<sub>2</sub> meters and a FUEL CELL MODULE SKIN TEMP of above 400 °F.

	* ~~Switch to time acceleration 100~~. Switch the FUEL CELL ~~INDICATOR~~ to position 1. ~~You can monitor a hydrogen~~ and ~~oxygen flow above 0 lb/hr on the FUEL CELL FLOW H<sub>2</sub>/O<sub>2</sub> meters and a FUEL CELL MODULE SKIN TEMP of above 400 °F~~.		* Make sure that the FC REACS VALVES switch is in NORM position, otherwise you cannot operate the fuel cell reactants valves. Switch the FUEL CELL REACTANTS 1 switch to OFF (down position). The switch is spring-loaded and flips back to to center position.

	* ~~Make sure that the~~ FC ~~REACS VALVES switch~~ is ~~in NORM position~~, ~~otherwise you cannot operate the~~ fuel cell ~~reactants valves~~. ~~Switch~~ the ~~FUEL CELL REACTANTS 1 switch~~ to ~~OFF (down position). The~~ switch ~~is spring-loaded and flips back to to center position. Now fuel cell 1 is down,~~ the ~~FUEL CELL REACTANTS~~ 1 ~~indicator changes~~ to ~~striped-line indication, both flows are 0 lb/hr, but the fuel cell skin temperature remains almost unchanged because the fuel cell temperature is still maintained by the fuel cell heaters~~.		* The FC BUS DISCONNECT alarm is triggered, because fuel cell 1 is disconnected from main bus A. Push the MASTER ALARM pushbutton/light to turn off the alarm and switch the FC MNA 1 switch to OFF.

	* Switch the FUEL CELL HEATERS 1 switch to OFF (down position). The fuel cell skin (and condenser exhaust) temperature decreases slowly. Wait until it drops below 300 °F (use time acceleration 1000, if you are impatient~~...~~).		* Now fuel cell 1 is down, the FUEL CELL REACTANTS 1 indicator changes to striped-line indication, both flows are 0 lb/hr, but the fuel cell skin temperature remains almost unchanged because the fuel cell temperature is still maintained by the fuel cell heaters.

			* Switch the FUEL CELL HEATERS 1 switch to OFF (down position). The fuel cell skin (and condenser exhaust) temperature decreases slowly. The FC 1 alarm is triggered when the fuel cell temperatures get too low, push the MASTER ALARM pushbutton again. Wait until it drops below 300 °F (use time acceleration 100 to 1000, if you are impatient).

	* Switch the FUEL CELL REACTANTS 1 switch to ON (up position). Unfortunatly the fuel cell does not start, because the skin temperature is below 300 °F.		* Switch the FUEL CELL REACTANTS 1 switch to ON (up position). Unfortunatly the fuel cell does not start, because the skin temperature is below 300 °F.

	* Switch the FUEL CELL HEATERS 1 switch to up position. The fuel cell skin temperature increases slowly. After 300 °F is reached, again switch the FUEL CELL REACTANTS 1 switch to ON (up position). The fuel cell turns on, the flows are normal again and the skin temperature increases quickly to the old value. The fuel cell is running normally again.		* Switch the FUEL CELL HEATERS 1 switch to up position. The fuel cell skin temperature increases slowly (use time acceleration about 100 again). After 300 °F is reached, again switch the FUEL CELL REACTANTS 1 switch to ON (up position). The fuel cell turns on, the flows are normal again and the skin temperature increases quickly to the old value. The fuel cell is running normally again.

	== Fuel cell radiator emergency bypass ==		== Fuel cell radiator emergency bypass ==

imported>Mark Grant: Experience reports.

2006-11-29T01:25:09Z

Experience reports.

← Older revision		Revision as of 01:25, 29 November 2006
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	#[[References]]		#[[References]]
	</biblio>		</biblio>

			==External Links==

			* [http://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/19740011403_1974011403.pdf Apollo experience report: Command and service module electrical power distribution subsystem]
			* [http://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/19720024228_1972024228.pdf Apollo experience report: Battery subsystem]

	[[Category:CSM systems]]		[[Category:CSM systems]]

imported>Tschachim: CSM Electrical Power System moved to Electrical Power System (CSM)

2006-11-19T00:51:38Z

CSM Electrical Power System moved to Electrical Power System (CSM)

← Older revision

Revision as of 00:51, 19 November 2006

imported>Tschachim at 13:28, 13 October 2006

2006-10-13T13:28:18Z

← Older revision		Revision as of 13:28, 13 October 2006
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	* Switch the FUEL CELL RADIATORS 1 switch to NORMAL (up position). Switch the FUEL CELL REACTANTS 2 and 3 switches to ON (up position). You are now back in "normal mode". The FC RAD TEMP LOW indicator should show gray indication again.		* Switch the FUEL CELL RADIATORS 1 switch to NORMAL (up position). Switch the FUEL CELL REACTANTS 2 and 3 switches to ON (up position). You are now back in "normal mode". The FC RAD TEMP LOW indicator should show gray indication again.

	~~== References ==~~
	<biblio force=false>		<biblio force=false>
	#[[References]]		#[[References]]

imported>Tschachim at 11:50, 13 October 2006

2006-10-13T11:50:43Z

← Older revision		Revision as of 11:50, 13 October 2006
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	== Cryogenic tank and fuel cell check ==		== Cryogenic tank and fuel cell check ==

	During normal operations the cryo tanks and fuel cells should operate as descriped in the original Apollo documentation~~. The following procedures are from the Apollo-Soyuz test project Operations handbook reference issue (see below)~~.		During normal operations the cryo tanks and fuel cells should operate as descriped in the original Apollo documentation<cite>ASTP_AOH2</cite>.

	[[Image:CSM_EPS_check.gif]]		[[Image:CSM_EPS_check.gif]]
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	== Fuel cell purging ==		== Fuel cell purging ==

	To keep the fuel cells working properly, it's necessary to do fuel cell purging from time to time. Unlike shown in the original Apollo documentation below in Project Apollo it's not necessary to wait after switching the H<sub>2</sub> PURGE LINE switch to HTR, but to do on H<sub>2</sub> purging it's necessary to turn on the H<sub>2</sub> purge line heater~~. The procedures are from the Apollo-Soyuz test project Operations handbook reference issue (see below)~~.		To keep the fuel cells working properly, it's necessary to do fuel cell purging from time to time. Unlike shown in the original Apollo documentation<cite>ASTP_AOH2</cite> below in Project Apollo it's not necessary to wait after switching the H<sub>2</sub> PURGE LINE switch to HTR, but to do on H<sub>2</sub> purging it's necessary to turn on the H<sub>2</sub> purge line heater.

	[[Image:CSM_EPS_Fuel_Cell_Purging.gif]]		[[Image:CSM_EPS_Fuel_Cell_Purging.gif]]
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	* Switch the FUEL CELL RADIATORS 1 switch to NORMAL (up position). Switch the FUEL CELL REACTANTS 2 and 3 switches to ON (up position). You are now back in "normal mode". The FC RAD TEMP LOW indicator should show gray indication again.		* Switch the FUEL CELL RADIATORS 1 switch to NORMAL (up position). Switch the FUEL CELL REACTANTS 2 and 3 switches to ON (up position). You are now back in "normal mode". The FC RAD TEMP LOW indicator should show gray indication again.

			== References ==
			<biblio force=false>
			#[[References]]
			</biblio>

	[[Category:CSM systems]]		[[Category:CSM systems]]

imported>Tschachim at 10:17, 13 October 2006

2006-10-13T10:17:45Z

← Older revision		Revision as of 10:17, 13 October 2006
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	This section provides step-by-step examples and instructions how to use the '''Electrical Power System (EPS)'''. Hopefully this will help users to get a better understanding and feeling how to work with the spacecraft systems. In these procedures it is assumed that the spacecraft is in a "stable condition" without flying manoeuvers with the systems in "flight configuration", for example during Trans Lunar Coast and you can use time acceleration up to 1000 so that all of the internal systems have reasonable reaction times.		This section provides step-by-step examples and instructions how to use the '''Electrical Power System (EPS)'''. Hopefully this will help users to get a better understanding and feeling how to work with the spacecraft systems. In these procedures it is assumed that the spacecraft is in a "stable condition" without flying manoeuvers with the systems in "flight configuration", for example during Trans Lunar Coast and you can use time acceleration up to 1000 so that all of the internal systems have reasonable reaction times.

	== ~~CSM cryogenic~~ tank and fuel cell check ==		== Cryogenic tank and fuel cell check ==

	During normal operations the cryo tanks and fuel cells should operate as descriped in the original Apollo documentation. The following procedures are from the Apollo-Soyuz test project Operations handbook reference issue (see below).		During normal operations the cryo tanks and fuel cells should operate as descriped in the original Apollo documentation. The following procedures are from the Apollo-Soyuz test project Operations handbook reference issue (see below).
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	[[Image:CSM_EPS_check.gif]]		[[Image:CSM_EPS_check.gif]]

	== ~~CSM fuel~~ cell purging ==		== Fuel cell purging ==

	To keep the fuel cells working properly, it's necessary to do fuel cell purging from time to time. Unlike shown in the original Apollo documentation below in Project Apollo it's not necessary to wait after switching the H<sub>2</sub> PURGE LINE switch to HTR, but to do on H<sub>2</sub> purging it's necessary to turn on the H<sub>2</sub> purge line heater. The procedures are from the Apollo-Soyuz test project Operations handbook reference issue (see below).		To keep the fuel cells working properly, it's necessary to do fuel cell purging from time to time. Unlike shown in the original Apollo documentation below in Project Apollo it's not necessary to wait after switching the H<sub>2</sub> PURGE LINE switch to HTR, but to do on H<sub>2</sub> purging it's necessary to turn on the H<sub>2</sub> purge line heater. The procedures are from the Apollo-Soyuz test project Operations handbook reference issue (see below).
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	[[Image:CSM_EPS_Fuel_Cell_Purging.gif]]		[[Image:CSM_EPS_Fuel_Cell_Purging.gif]]

	== ~~CSM~~ H<sub>2</sub> cryogenic tank pressurization ==		== H<sub>2</sub> cryogenic tank pressurization ==

	During normal operations cryogenic hydrogen from the cryo tanks is consumed by the fuel cells, so for this procedure it is necessary that the fuel cells are turned on and all cryo tank heaters and fans are switched to AUTO. The cyro tank fans and heaters then maintain the pressure in the tanks.		During normal operations cryogenic hydrogen from the cryo tanks is consumed by the fuel cells, so for this procedure it is necessary that the fuel cells are turned on and all cryo tank heaters and fans are switched to AUTO. The cyro tank fans and heaters then maintain the pressure in the tanks.
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	* Switch the H<sub>2</sub> HEATERS 2 switch and the H<sub>2</sub> FANS 2 switch back to AUTO (up position). Now the tanks are operated automatically again. Please notice that they now doesn't operate "synchronously" as before.		* Switch the H<sub>2</sub> HEATERS 2 switch and the H<sub>2</sub> FANS 2 switch back to AUTO (up position). Now the tanks are operated automatically again. Please notice that they now doesn't operate "synchronously" as before.

	== ~~CSM fuel~~ cell shutdown and restart ==		== Fuel cell shutdown and restart ==

	{{Attention \| message=Because of the work-in-progress of the EPS this procedure is not working at the moment.}}		{{Attention \| message=Because of the work-in-progress of the EPS this procedure is not working at the moment.}}
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	* Switch the FUEL CELL HEATERS 1 switch to up position. The fuel cell skin temperature increases slowly. After 300 °F is reached, again switch the FUEL CELL REACTANTS 1 switch to ON (up position). The fuel cell turns on, the flows are normal again and the skin temperature increases quickly to the old value. The fuel cell is running normally again.		* Switch the FUEL CELL HEATERS 1 switch to up position. The fuel cell skin temperature increases slowly. After 300 °F is reached, again switch the FUEL CELL REACTANTS 1 switch to ON (up position). The fuel cell turns on, the flows are normal again and the skin temperature increases quickly to the old value. The fuel cell is running normally again.

	== ~~CSM fuel~~ cell radiator emergency bypass ==		== Fuel cell radiator emergency bypass ==

	{{Attention \| message=Because of the work-in-progress of the EPS this procedure is not working at the moment.}}		{{Attention \| message=Because of the work-in-progress of the EPS this procedure is not working at the moment.}}

imported>Tschachim: Electrical Power System moved to CSM Electrical Power System

2006-10-13T10:15:24Z

Electrical Power System moved to CSM Electrical Power System

← Older revision

Revision as of 10:15, 13 October 2006